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  1. #1
    AmishWarlord's Avatar
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    K&B Sportster Club

    This is a club for the Sportster line of K&B engines and the models that are powered by them.

    I'll be adding info to the post below. So check back to this page.


    General characteristics of a K&B Sportster engines

    That all have the same crank shaft size. 1/4"-28 TPI

    Most people who run these engines state that they like to run on a high level of caster oil "25%" in the fuel and that synthetic fuels cause problems.

    The timing of these engines make it so that they do not like to run well at high RPM.
    You should treat these engines more like a 4-stroke or Diesel, as in they like to swing larger props at slower speeds.


    No Sea Plane, flown with a K&B Sportster, has ever had rusty ball bearings in the engine.
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  2. #2
    AmishWarlord's Avatar
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    RE: K&B Sportster Club

    K&B Sportster .20

    Where to buy new. https://shop.mecoa.com/shopdisplayproducts.asp?id=22

    Start prop, 9x4

    Fuel tank size 4 oz.

    Fuel 5% Nitro, 25% caster

    Glow Plug, standard Long Reach Glow Plug

    Carb size .199 ID .437 OD

    Owners guide
    http://www.mecoa.com/kb/56/5600.htm

    Parts

    Accsessories

    Muffler Gaskets, ebay larrybtoys http://www.ebay.com/itm/K-B-Sportste...-/320707403168

    Perry Carbarator #3701 Standard carb http://www.perrypumps.com/

    Fuel Regulator Iorn Bay http://www.ironbaymodelcompany.com/i...es/Page438.htm



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  3. #3
    AmishWarlord's Avatar
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    RE: K&B Sportster Club

    K&B Sportster .28

    Start prop, 9x4

    Fuel tank size, 6 oz.

    Fuel, 5% Nitro 25% caster

    Glow plug, standard Long Reach Glow Plug

    Carb size .248 ID .437 OD

    Owners guide,
    http://www.mecoa.com/kb/56/5680.htm

    New Engines
    https://shop.mecoa.com/shopdisplayproducts.asp?id=22

    Accessories

    Carb,

    Perry Carb, #2100
    http://www.perrypumps.com/prod01.htm

    Fuel Regulator,
    http://www.ironbaymodelcompany.com/i...es/Page438.htm


    J-Tec mufflers
    Custom made
    http://www.jtecrc.com/incowlmufflers10-39.htm


    Bission mufflers

    Pitts,
    http://www.bissonmufflers.com/en/muf...ting_id=113959

    Sport
    http://www.bissonmufflers.com/en/muf...ting_id=113960

    Quite Sport
    http://www.bissonmufflers.com/en/muf...ting_id=113961

    Upright
    http://www.bissonmufflers.com/en/muf...ting_id=113962

    Inverted
    http://www.bissonmufflers.com/en/muf...ting_id=113963

    Tru-Turn Spinners
    Adapter TT-0140-A
    1/4-28 ADP Kit With 1/4" Bushing
    http://www.truturn.com/cgi-bin/store...0a&ppinc=adapt





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  4. #4
    AmishWarlord's Avatar
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    RE: K&B Sportster Club

    K&B Sportster .45

    Start prop 10x6

    Fuel tank size 8 to 10 oz.

    Fuel 5% Nitro 25% caster

    Glow plug, standard long glow plug

    Carb size .270 ID .530 OD

    Owners guide
    http://www.mecoa.com/kb/59/5900.htm

    New Engines
    MECOA
    https://shop.mecoa.com/shopdisplayproducts.asp?id=22

    Parts

    Accessories

    Perry Carbs,
    Standard #2600
    Pump #9300
    http://www.perrypumps.com/prod01.htm

    Fuel management,

    VP-30 Regulating pump for use with pump carbs
    http://www.perrypumps.com/prod02.htm

    Iron Bay Fuel Regulator for non-pump carbs
    http://www.ironbaymodelcompany.com/i...es/Page438.htm


    Slimline pitts muffler, #3513
    http://www.slimlineproducts.com/pk4/store.pl?section=91

    Bisson Muffler #11048
    http://www.bissonmufflers.com/en/muf...ting_id=113999

    Macs Mufflers
    .40 Size Adapter Muffler #6400
    Adapter Plate #6548
    http://www.macspro.com/onepiece.asp

    Macs Headers
    Standard 2540
    Long 2541
    Ex-long 2542
    15° marine 2543
    http://www.macspro.com/headers_side.asp


    On Board Glow Hobby King
    http://www.hobbyking.com/hobbyking/s...dproduct=15517


    Tru-Turn Spinners
    Adapter TT-0140-A
    1/4-28 ADP Kit With 1/4" Bushing
    http://www.truturn.com/cgi-bin/store...0a&ppinc=adapt



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  5. #5
    AmishWarlord's Avatar
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    RE: K&B Sportster Club

    K&B Sportster .65

    Start prop 11x7

    Fuel tank size, 12 to 16 oz.

    Fuel, 5% Nitro 25% caster

    Glow plug, standard Long Reach Glow Plug

    Carb size .340 ID .625 OD

    Owners guide
    http://www.mecoa.com/kb/58/5800.htm


    New Engines,
    MECOA
    https://shop.mecoa.com/shopdisplayproducts.asp?id=22

    Carbs,

    Perry Carbs
    Standard Carb 4600
    Pump Carb 9600
    http://www.perrypumps.com/prod01.htm#kb

    Fuel management,

    VP-30 Regulating pump for use with pump carbs
    http://www.perrypumps.com/prod02.htm

    Iron Bay Fuel Regulator for non-pump carbs
    http://www.ironbaymodelcompany.com/i...es/Page438.htm


    Spinner adapters,

    Tru-Turn
    TT-0140-A
    1/4-28 ADP Kit With 1/4" Bushing
    http://www.truturn.com/cgi-bin/store...0a&ppinc=adapt

    Mufflers,

    Bission
    .65 Pitts #11061
    http://www.bissonmufflers.com/en/muf...ting_id=114000
    .65 Sport #11062
    http://www.bissonmufflers.com/en/muf...ting_id=114001


    Macs
    One Piece Mufflers
    http://www.macspro.com/onepiece.asp
    .60 size Adapter Muffler #6700
    Adapter Plate #6788

    Macs Tuned Pipe Headers
    http://www.macspro.com/headers_side.asp
    Standard 2780
    Long 2781
    Ex-long 2782
    15° marine 2783


    Slimline
    Pitts #3112
    Invert or Upright #3102
    http://www.slimlineproducts.com/pk4/store.pl?section=92

    On Board Glow Hobby King
    http://www.hobbyking.com/hobbyking/s...dproduct=15517

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  6. #6
    flyingagin's Avatar
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    RE: K&B Sportster Club

    Thanks Amish
    I have owned 2 .20s and 2 .45s. Presently own a .65. Wish I still had the previous 4 engines.
    Good running engines if treated correctly. They are made a little different and so need to be treated the same.
    Just so others know they like oil. They also need a goodly amount of castor oil in the mix. Give 'em what they want and they will go forever.
    So here is an earlier pic of my plane sporting a sportster. The plane is still under construction and will keep the .65 sportster.
    Amish, I bet you reconize this plane. I will have to slap the engine back on for some pics now that it has some paint.
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    \"As for Me and My House, We Will Serve the Lord\"
    Club Saito Member 775
    Club K&B Sportster
    Sig Kadet Brotherhood 15

  7. #7

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    RE: K&B Sportster Club

    Big time Sportster fan here! I have at least one of each size. The oldest, a 65, was bought in 1987( it has no bronze bushing and an O-ring head gasket). I have yet to wear one out.

  8. #8
    1QwkSport2.5r's Avatar
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    RE: K&B Sportster Club

    I currently have 2 Sportster .65's from the Goldberg Mig-27 Army Drone foamies. They have bad carbs so I'm in search of new ones that actually work. Mine were made in 1990 or so, and have no head gasket. Metal to Metal head, and no bronze bushings either.

    I am keeping my eyes open for a .20, .28, and a .45 so I can have at least 1 of each size. I'll only buy these engines New as most people dont run castor fuel in them and ruin them.

    I'm a big fan of the Sportster engines as well. No planes to speak of just yet... but that will change with time. I love the sound they make.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  9. #9
    flyingagin's Avatar
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    RE: K&B Sportster Club

    I think many people thought poorly of them, but it was simply a lack of knowledge. The right kinds of oil and right amount, make all the defference.
    I prop them more like a 4 stroke. And the fuel burn is very low compared to other 2 strokes. I have had my .65 go for more than 30 minutes on 1 tank (16 ounce) of fuel doing touch and go practice.
    For oil I go for 22% with 1/2 being castor.
    \"As for Me and My House, We Will Serve the Lord\"
    Club Saito Member 775
    Club K&B Sportster
    Sig Kadet Brotherhood 15

  10. #10
    flyingagin's Avatar
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    RE: K&B Sportster Club


    ORIGINAL: 1QwkSport2.5r

    I'll only buy these engines New as most people dont run castor fuel in them and ruin them.
    You got that right.

    \"As for Me and My House, We Will Serve the Lord\"
    Club Saito Member 775
    Club K&B Sportster
    Sig Kadet Brotherhood 15

  11. #11
    1QwkSport2.5r's Avatar
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    RE: K&B Sportster Club


    ORIGINAL: flyingagin

    I think many people thought poorly of them, but it was simply a lack of knowledge. The right kinds of oil and right amount, make all the defference.
    I prop them more like a 4 stroke. And the fuel burn is very low compared to other 2 strokes. I have had my .65 go for more than 30 minutes on 1 tank (16 ounce) of fuel doing touch and go practice.
    For oil I go for 22% with 1/2 being castor.*
    I was running mine on 5% nitro 20% oil SIG champion (oil is 50/50 cas/syn) but I have since converted to ALL castor in ALL of my engines. My sportsters get 5% nitro 25% castor, but they still dont idle or transition for poo. I quit using muffler pressure which gave better rpm but still a lousy idle (wont idle) and horrible transition (rich).... Grr..

    If anyone has 2 good/working carbs that will fit the .65 (.622" neck) I will buy them in a heartbeat.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  12. #12
    1QwkSport2.5r's Avatar
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    RE: K&B Sportster Club


    ORIGINAL: flyingagin


    ORIGINAL: 1QwkSport2.5r

    *I'll only buy these engines New as most people dont run castor fuel in them and ruin them.
    You got that right.

    Thats the reason I dont have a .20, .28, or a .45 yet. I'm not much of a fan of Randy at Mecoa, so I'd rather buy engines from RCU members. Just waiting for some NIB engines to show up in the marketplace.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  13. #13
    AmishWarlord's Avatar
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    RE: K&B Sportster Club

    RCU is being a pain for me. It wont load, syays I posted to fast, says service unavalible, goes to web page not found. Grrrr

  14. #14

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    RE: K&B Sportster Club

    I think of mine as a poor mans 4 stroke. Fantastic! I have 8 Sportster 65's.

  15. #15
    AmishWarlord's Avatar
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    RE: K&B Sportster Club

    ORIGINAL: 1QwkSport2.5r

    If anyone has 2 good/working carbs that will fit the .65 (.622'' neck) I will buy them in a heartbeat.




    I put a link to the Perry carbs up there.

  16. #16
    flyingagin's Avatar
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    RE: K&B Sportster Club

    I have a couble of .60ish carbs, sans engines, I will check the neck size.
    \"As for Me and My House, We Will Serve the Lord\"
    Club Saito Member 775
    Club K&B Sportster
    Sig Kadet Brotherhood 15

  17. #17

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    RE: K&B Sportster Club

    So what's the plane with the .65?

    I liked my .20 on the test stand very much. Have not flown it yet. I used 22% oil, 1/2 castor, and broke it in with short rich runs, gradually getting leaner. It just got better and better. At the end, it would turn a 12x4 without any complaint.

    And yes, the sound with the stock muffler is nice.

    Jim

  18. #18
    1QwkSport2.5r's Avatar
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    RE: K&B Sportster Club

    ORIGINAL: AmishWarlord

    ORIGINAL: 1QwkSport2.5r

    If anyone has 2 good/working carbs that will fit the .65 (.622'' neck) I will buy them in a heartbeat.




    I put a link to the Perry carbs up there.
    If I wanted to spend $100 on a carb, I'd buy 2 new K&B carbs. I am not in a hurry, so I'm hoping to find 2 identical used carbs. Preferably SuperTigre carbs if they even make a carb with a .622" neck. Otherwise I'd take 2 OS carbs or if TT has a carb that fits. Perry is a last resort... If by May I havent found anything, I'll order 2 new carbs.


    ORIGINAL: flyingagin

    I have a couble of .60ish carbs, sans engines, I will check the neck size.*
    These Sportster .65's have unusually HUGE carb fittings.. The guy at my local plane/heli shop said something along the lines of "Holy crap thats huge!".

    The base is .622" and the venturi is .334". A slightly bigger venturi doesnt bother me since the muffler extensions have pressure taps.

    I compared my carb's internals (visually) to Hobbsy's Sportster .65 carb and they look identical. Supposedly the Drone engines have botched up carbs. Rumor has it a new Idle disk might fix my problems, but I'm not in the position to throw $40 into the wind since the Barrel might be part of the problem as well. A new barrel (and carb housing comes with the barrel as a set) and idle disk costs as much as a whole carb from Mecoa.

    Edit: This forum is really getting aggravating with all the errors and timeouts. It took me almost a half hour to post this. For how much sponsorship this site gets, you'd think they'd be able to get their server problems sorted out a lot quicker than they are.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  19. #19
    1QwkSport2.5r's Avatar
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    RE: K&B Sportster Club


    ORIGINAL: buzzard bait

    So what's the plane with the .65?

    I liked my .20 on the test stand very much. Have not flown it yet. I used 22% oil, 1/2 castor, and broke it in with short rich runs, gradually getting leaner. It just got better and better. At the end, it would turn a 12x4 without any complaint.

    And yes, the sound with the stock muffler is nice.

    Jim
    Your sportster would be even happier if you fed it all castor and no synthetic. Mine turns 400rpm faster on all castor vs. SIG Champion which is 50/50 blend. Thats with 25% castor to boot.

    The front bushing on my .65 doesnt spew nearly as much oil as it used to on SIG fuel.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  20. #20

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    RE: K&B Sportster Club

    I run my 65 with a BCM low DB muffler. I have people come up to me and ask what I'm flying as it sounds more like a 4-stroke than anything. I tell them what it is and they have to see it after landing as they don't believe it. I put it on 45 sized aerobatic planes using the spider backplate soft mounted with a 13 x 5 prop. Great power and extended verticals without a lot of speed. The extra airflow over the control surfaces makes for some really smooth landings. I Really like it in that role!

  21. #21

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    RE: K&B Sportster Club

    Very interesting. Only issue is how many different kinds of fuel I'm going to keep!

  22. #22
    AmishWarlord's Avatar
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    RE: K&B Sportster Club

    No kidding. Took me hours just to put up what little info I have up now.

    Should have taken 45 mins.

  23. #23
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    RE: K&B Sportster Club

    I happen to have four K&B .20 Sportster engines and a .65 Sportster engine too. I had originally planned to use the .20 engines on a Royal B-17 I was building but the framed up plane met its end when I was moving and got crushed in the process.












    Club Saito #722, Sig Kadet Brotherhood #80, GlowHead Brotherhood #14,
    AMA # 928076

  24. #24
    1QwkSport2.5r's Avatar
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    RE: K&B Sportster Club


    ORIGINAL: buzzard bait

    Very interesting. Only issue is how many different kinds of fuel I'm going to keep!
    I didnt want to have 10 different mixes, so I just run 2 standard mixes. (I make my own fuel). ALL airplane engines regardless of cylinder/piston construction is 5% nitro 20% castor minimum. My Sportsters and my Fox .40 (single BB) will get 25% castor and 5% nitro. My car engines (2 - .20's, a .26, and a .28 all ABC) get 20% nitro and 12% oil although I am going to test 8% oil and 10% oil tomorrow in the .26 and .28.

    I got a funny look from one of my Airboat buddies last summer. "Your engine's exhaust smells weird" He's used to Omega, so of course it smelled funny.. haha.
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.


  25. #25
    1QwkSport2.5r's Avatar
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    RE: K&B Sportster Club

    ORIGINAL: earlwb

    I happen to have four K&B .20 Sportster engines and a .65 Sportster engine too. I had originally planned to use the .20 engines on a Royal B-17 I was building but the framed up plane met its end when I was moving and got crushed in the process.


    Would you consider selling one of your .20's or do you still have plans of flying all 4 of them?

    edit: Also, your .65 has the big head fins on it. Must be an early model. Most of the newer-than-'90 engines have the short machined head fins.

    edit #2 (while RCU will let me): Since this is a new club and I feel left out since I dont have a club member number in the Enya, Fox, or ST clubs... can I be #4 if we do member numbers? [8D] (I know it is of zero importance but I dont care.. lol)
    GlowHead Brotherhood #3
    Using Dynamite, Enya, Fox, Jett, K&B, SH, Super Tigre, Thunder Tiger, and Traxxas engines.



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