MormonMike

My Feedback: (2)

Any of you guys here had a problem with these 1.15's blowing a timing gear ? One of mine broke down in flight, no problem, great dead-stick in my GP Cessna 182. This is my first encounter with this situation and I own 33 Saito 4-strokes. And no, I never over-reve or run lean. I know those could cause problems. Could it be just a fluke or an isolated incident. Engine is only about a year old with maybe a dozen flights and a very low idle RPM break-in. MM

proptop

My Feedback: (8)

Not with a 1.15 but a friend had that happen to his .80 GK several years back...the cam gear lost a couple teeth.

w8ye

My Feedback: (16)

There was a big thread about lack of lubrication on a 115 timing gear last year

42etus

My Feedback: (2)

Here ya go, read to your heart's content.

http://www.rcuniverse.com/forum/m_84..._1/key_/tm.htm

BTW I have had zero problems with my 115 since I moved the crankcase breather nipple. See post #244 in the above thread.

Paul

[email protected]

Hi Saito guys , need some wisdom , just got a new Saito 65 trying to break it in and not happy with it. I guess maybe I'm spoiled but this is my fourth Saito ,have a 56/ 72 / 91

never had a miutes heart ache with any of them. This one starts Ok but doesn't want to run a full tank . A few minutes into the run it starts to run rough then stops dead. Fire it up and it starts right up again , any ideas would be welcome , to say the least , I'm very dissappoined , please help my email is [email protected] thanks Bob A

NM2K

My Feedback: (14)

Check your fuel tank vent line for kinks or occlusions. This is not typical behavior for any Saito engine.


Ed Cregger

[email protected]

Thanks for responding Ed, as I said I'm disapointed to say the least . Haven't had a chance to do any thing with it since last Sat. but I'm changing the tank , new lines and just to be sure I'm going to flush out the carb. Any other suggestions would be most welcome , thanks again

Regards Bob A

mike109

G'day I have 14 Saitos and have never had anything like this with them but with two other engines I did have a similar problem. One had a muffler pressure fitting totally blocked with oil residue and the other had a muffler pressure fitting which had not been drilled properly and was blocked with metal. In both cases, the engine would start and run but eventually the partial vacuum in the tank would stop the fuel flow and the engine would stop.

As has been said, it sounds like a blockage somewhere in the fuel system. It is certainly not typical of Saitos.

[email protected]

Hi guys here Iam again, ran my Saito 65 again today after changing tank/fuel lines clunk . It ran better got about 25-30 minutes on it but just does not want to take full throttle.
Runs up fine till about 7500-8000 rpms but open it up and she quits help help thanks Bob A

w8ye

My Feedback: (16)

Maybe the timing is off?

If the cam timing is advanced one or two teeth, the engine will idle fine but just doesn't get with it on high speed

Rudolph Hart

Cleaned the carby?

[email protected]

flushed the carb w/fuel and would you think I'd have a timing problem with a brand new engine ? Thanks for all the responses one of these remedies has to work dumb question would the low end contribute to this kind of behavior , as I said dumb question thanks again


Bob A

Hobbsy

My Feedback: (102)

Bob, having the LS needle too lean can render the HS needle ineffective, Open the LS needle one half turn and see if that helps.

[email protected]

Thanks Hobbsy, I'll give that a try in the next day or so sure hope that works will let you know thanks again Bob A

[email protected]

Hey guys, ran my Saito 65 again today and incorperated some of your suggestions and guess what, I finally got it running decently . The thing that helped the most was bopening the LS needle , still wants to idle a bit on the high side but overall its better. Getting about 10200 with a a apc 12/6 and idle at about 3500 as I said a bit high but I think when I get more time on it maybe a few flights it will settle down. Thanks again for all the help

Bob A

Hobbsy

My Feedback: (102)

As you can see the LS needle is actually a sleeve that slides in and out over the spraybar. If it gets too far in over the cats eye slot then it limits fuel flow at full throttle. There is a sweet spot where the best idle is and still allow full fuel flow at full throttle. Yours is the same as on the right, a hairline crack compared to the 2.20s slot.

[email protected]

Hey Guys thanks again I'll keep you posted


Bob A

jaka

Hi!
I would say a 12x6 is a little to small prop for a .65 four stroke! Use a 13x5 or 13x6 instead, Naturally APC or RAM!
Idle with those props should be around 2000-2500rpm.

gamellir

My Feedback: (42)

My boss has a Saito 1.15 and has blown 3 cams. Everytime I pull the engine apart I find 1 or more teeth missing from the cam.
I finally complained to Horizon and they sent me a cam no charge. The last one has been running fine. I told my boss not to use an electric starter and add a little castor to his fuel.
So far so good.
They must have had a bad batch of cams

42etus

My Feedback: (2)

Gamellir, you're not paying attention. Go back and read the first four posts. Then click on the link in post #4. THE GEARS ARE DRY. They aren't getting any lubrication, caster won't help if it never gets to the cam. Some guys mod the engine, others pre-lube the cam and still others stand the plane on it's nose overnight. Anything to get oil to the cam will work, but do nothing and your engine will forever eat cams. I believe this is a design flaw in the 1.15. Others don't think so. Bottom line is that many 1.15s suffer cam failure due to lack of lubrication, but if you do SOMETHING to get oil into the cam area, they run great.

Paul

Rudolph Hart

Well he may be,just explained it different.You are right pulled mine down and the cam is always dry so prelube it.

gamellir

My Feedback: (42)

42ETUS,when we opened the cam box we found it had plenty of oil. The first replacement cam lastest 3 flights.
Aftter I complained to Horizon they sent me a new cam that has been running fine ever since.
So I think our problem is metalurgical and not lubrication. We added castor to the fuel and stopped using an electric starter to help cushion the cam gears.
And by the way, I am fully aware of the thread on the Saito 1.15 lubrication issues and crankcase breather location, so don't be such a smart guy when replying to other peoples posts

Hobbsy

My Feedback: (102)

I never did buy into the dry cam theory either, I ran my 1.15 on all syn fuel then immediately pull the cam box off, the cam was plenty wet. Cams get broken when people under prop and over rev the engines.

42etus

My Feedback: (2)

OK guys. You both opened your engines up and found the cam well oiled. That's great, what ever you're doing is working, keep it up, BUT some of us open ours up only to find it bone dry! This indicates that the engine isn't lubing the cam as it should, but that something you guys are doing is getting oil in there. What is it, who knows? Maybe lots of ARO at the end of the day, maybe the attitude the plane is stored in your hanger, maybe your grandmother secretly lubes it during a full moon. What I do know is that my engine (and others also) were COMPLETELY with out oil in the cam area when operated normally. Oil just wasn't getting where it belonged while the engine was running. I solved the issue in my 1.15 by moving the vent nipple to behind the front bearing, which is the same place Saito moved it when they redesigned the .80 into the .82 . They may be on to something there. Since doing that, my cam is also wet with oil when I open it.

Sorry, I'm not meaning to turn this into the same cam failure thread of a year ago.

Rudolph Hart

Hello dave hope all is well.I ran the 115 some time back in a slippery aeroplane and had the needle peaked to the point it would backfire if you pulled the throttle back on a low pass.What you say makes sense.