RE: New 53cc engine now available  
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RE: New 53cc engine now av... - 7/22/2008 12:32:38 AM   
rctom



Posts: 5195
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: online 		Burbling goes away as you lean the low speed needle.

(in reply to Sandy69)
       Post #: 576

RE: New 53cc engine now av... - 7/22/2008 12:55:20 AM   
Sandy69


 

Posts: 50
Joined: 8/27/2004
From: Dartmouth, NS, CANADA
Status: offline 		still on the second gallon so a ways to go yet....

(in reply to rctom)
       Post #: 577

RE: New 53cc engine now av... - 7/22/2008 1:21:55 AM   
rctom



Posts: 5195
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: online
quote:

ORIGINAL: Sandy69

still on the second gallon so a ways to go yet....


You can lean out the low end at any time, high end also within reason. It's better to have it right than to run it too rich, and the low end by definition is only used in low power situations which are not going to heat the engine up.

TF

(in reply to Sandy69)
       Post #: 578

RE: New 53cc engine now av... - 7/22/2008 1:30:22 AM   
Sandy69


 

Posts: 50
Joined: 8/27/2004
From: Dartmouth, NS, CANADA
Status: offline 		OK, thanks. Didn't catch that from the instructions, kinda thought i should get 2 gallons before playing with the needles....

(in reply to rctom)
       Post #: 579

RE: New 53cc engine now a... - 7/22/2008 4:39:24 AM   
darrolair@yahoo.com


 

Posts: 36
Joined: 2/20/2006
From: polson, MT, USA
Status: online 		rctom,
I purchased one of these engines last year. When I received it, I ran it on a test stand about 10 ounces of fuel and promply placed it in my plane. Took it to the flying field. Fired it up and picked up the plane. Held it with the nose up, no problems. Tipped the wing and it died. I contacted you and you said to rotate the reed block and carby 180 degrees. The information worked really well. I'm now getting lots of spitting from the carby. After reading nearly every post on this engine, it looks like maybe the reed block could again be the nemesis. Did anyone sent their reed block back to you for examination and if so, what if anything have you seen or detected? Do you have a reed block on hand? I love this engine. Starts so good and lots of power.
Thanks,
Darrolair

(in reply to Sandy69)
       Post #: 580

RE: New 53cc engine now a... - 7/22/2008 4:48:47 AM   
rctom



Posts: 5195
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: online 		IF it runs well then it's unlikely the reed valve is leaking, sometimes those carbs do have a little fuel blowing out of them. Have you adjusted the high speed needle?

I do have spare reed valves, I also have the hop-up kit which gets more power and uses a different style of reed valve.

TF

(in reply to darrolair@yahoo.com)
       Post #: 581

RE: New 53cc engine now a... - 7/25/2008 6:47:43 PM   
Kenrico


 

Posts: 32
Joined: 9/20/2004
From: La Ceiba Honduras, HONDURAS
Status: offline 		Hello guys, Need some help here on the 53mm engine. Im in the process of Break-in the engine on my Honda SU-26 and the engine Manual says to rotate the carb 180 degrees if im using it on a Suk or Yak so ive posted the following pics of my engine maybe some one could tell me if its already rotated or not since I got the engine from Tom maybe it was already done. and what diference does it make, hey guys im a Total Newbie to gas engines so im trying to get all info posible. the only problem im having right now is goin from idle to full trottle if I move it up to quickly It wants to die but when its done slow the engine opens up with no problem, What would you guys recomend and that problem?

Thanks for your time,


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< Message edited by Kenrico -- 7/25/2008 6:53:52 PM >

(in reply to rctom)
       Post #: 582

RE: New 53cc engine now a... - 7/25/2008 8:34:09 PM   
BAS



Posts: 1384
Joined: 12/15/2001
From: Altoona, IA, USA
Status: offline 		No its not rotated need to have needles on the bottom if it was. It is easy to do just be carefull to not overtighten the carb bolts . I had a little burble in midrange on my yak with the carb in the stock position. As soon as i rotated carb block the motor ran much better and transition smoothed right out .

_____________________________

Bruce A Swartfager

(in reply to Kenrico)
       Post #: 583

RE: New 53cc engine now a... - 7/25/2008 9:05:40 PM   
Kenrico


 

Posts: 32
Joined: 9/20/2004
From: La Ceiba Honduras, HONDURAS
Status: offline 		Thank you Very much BAS for that fast reply i really appreciate your help. another question do I have to do the modification with the back plate that Tom suggest in the manual?

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(in reply to BAS)
       Post #: 584

RE: New 53cc engine now a... - 7/25/2008 9:22:41 PM   
rctom



Posts: 5195
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: online
quote:

ORIGINAL: Kenrico

Thank you Very much BAS for that fast reply i really appreciate your help. another question do I have to do the modification with the back plate that Tom suggest in the manual?

Probably not, test it first. Also it sounds like your low end is a little lean, open the needle 1/8 turn.

(in reply to Kenrico)
       Post #: 585

RE: New 53cc engine now a... - 7/25/2008 10:19:29 PM   
Kenrico


 

Posts: 32
Joined: 9/20/2004
From: La Ceiba Honduras, HONDURAS
Status: offline
quote:

ORIGINAL: rctom



Probably not, test it first. Also it sounds like your low end is a little lean, open the needle 1/8 turn.



thank you very much Tom ill be working on that tonight, what would be the syntoms for me to know if I need the modification or not ? do you think it would be a good idea to set needles to factory setting and start from there once I rotate the carb..?


(in reply to rctom)
       Post #: 586

RE: New 53cc engine now a... - 7/26/2008 2:28:43 AM   
rctom



Posts: 5195
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: online 		After you rotate the carb the engine will be rich so it's safe, then lean it down a little at a time on both high and low.

Low end will be as lean as you can get it and it still responds quickly to opening the throttle. Hi end wil be max rpm, then back the needle out 1/8 turn.

Test fly it before you make any changes, they may not be needed. You have the linkage all set up anyway, no harm will come from a couple test flights.

The problem you should look for is the engine loses power in klnife edge and/or inverted flight at partial throttle. IF that happens rotate the carb/reed block.

TF

(in reply to Kenrico)
       Post #: 587

RE: New 53cc engine now a... - 7/26/2008 5:30:06 AM   
Kenrico


 

Posts: 32
Joined: 9/20/2004
From: La Ceiba Honduras, HONDURAS
Status: offline 		Thanks for your help Tom I rotated the carb, so i'm going to run the engine and ajust the needles and do some fllights and see how it works, by sunday night I should have some results posted.

Thank you guys again for the help.


Kenric

(in reply to rctom)
       Post #: 588

RE: New 53cc engine now a... - 7/26/2008 7:49:18 PM   
Sandy69


 

Posts: 50
Joined: 8/27/2004
From: Dartmouth, NS, CANADA
Status: offline 		Tom, why is that rotation mod required for Yak's and Sukhois but not for something like my Extra??? I'm as new to gas as Kenrico

(in reply to Kenrico)
       Post #: 589

RE: New 53cc engine now a... - 7/26/2008 9:37:18 PM   
rctom



Posts: 5195
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: online
quote:

ORIGINAL: Sandy69

Tom, why is that rotation mod required for Yak's and Sukhois but not for something like my Extra??? I'm as new to gas as Kenrico


The carb inlet is sensitive to disturbances in airflow. ON round cowl planes there can be a lot of turbulence inside the cowl depending on how the plane is set up. This turbulence disrupt the smooth flow of fuel into teh venturi which is why we sometimes get fuel drops blowing out of the carb.

By rotating the carb/reed block it places the main jet orifice in a high pressure area that is less sensitive to the turbulence. This is why the engine usually ends up rich after the carb rotation, because now the fuel which was blowing out onto the firewall is now going into the engine.

Extra/Edge cowls do not have as much turbulence becxause the cooling air openings are much smaller.

TF

(in reply to Sandy69)
       Post #: 590

RE: New 53cc engine now a... - 7/26/2008 11:44:47 PM