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I have a Saito 125 that only gets 8300 rpm on a MA 16X6, Cool Power 15% nitro, I've checked the timing and valve lash they are good fine, very good compression, I've read the low end needle can effect top end rpm, is this true? Anything else I can look for?
Thanks guys.
Thanks guys.
Last edited by Dwayne; 06-22-2020 at 10:18 AM.
1. Will the engine idle at 2000 rpm for a long time and transition ok?
If so, your lsn is pretty close to being right and wouldn't affect the hsn much. If the lsn is set way rich you would have to lean the hsn a lot at wot. If the lsn needle is set way lean you may have to richen the hsn a lot. The hsn needle setting for most saitos will be 1 to 2 turns out from lightly seated.
2. When's the last time you checked the valve lash?
Really loose valve lash will affect power output.
3. Are the bearings noisy?
Bad bearings will affect power output.
4. How sure are you that it's a 16x6 prop?
I've made that mistake before.
Last edited by Glowgeek; 06-22-2020 at 10:23 AM.
A few questions:
1. Will the engine idle at 2000 rpm for a long time?
If so, your lsn is pretty close to being right and wouldn't affect the hsn much.
2. When's the last time you checked the valve lash?
Really loose valve lash will affect power output.
3. Are the bearings noisy?
Bad bearings will affect power output.
4. How sure are you that it's a 16x6 prop.
I've made that mistake before.
1. Will the engine idle at 2000 rpm for a long time?
If so, your lsn is pretty close to being right and wouldn't affect the hsn much.
2. When's the last time you checked the valve lash?
Really loose valve lash will affect power output.
3. Are the bearings noisy?
Bad bearings will affect power output.
4. How sure are you that it's a 16x6 prop.
I've made that mistake before.
Last edited by Dwayne; 06-22-2020 at 10:29 AM.
Is this a new engine, or is it an engine you've had for a while that's recently down on power?
Are you absolutely sure you're running a 16x6 prop? 8300 rpm is the correct rpm for an FA-125 spinning a 15x10, 16x8 or 17x6 prop.
Last edited by Glowgeek; 06-22-2020 at 10:41 AM.
At idle the engine shouldn't put out a lot of smoke. Lsn may be too rich.
Is this a new engine, or is it an engine you've had for a while that's recently down on power?
Are you absolutely sure you're running a 16x6 prop? 8300 rpm is the correct rpm for an FA-125 spinning a 15x10, 16x8 or 17x6 prop.
Is this a new engine, or is it an engine you've had for a while that's recently down on power?
Are you absolutely sure you're running a 16x6 prop? 8300 rpm is the correct rpm for an FA-125 spinning a 15x10, 16x8 or 17x6 prop.
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OK, so you are turning APC 15x6 at 8900, that's down for that prop. the 125 should turn an APC 16x6 at 9000 accordingly to Horizon! and I would think an a MA 16x6 would turn lower than an APC 16x6, some anyway.
so you replaced the bearings, did you put a new Cam in it ? the cam could be worn, keep working on it, if you can't find the problem it could be you need a new cam.
edited> it seams like the cam is timed correctly, so try a new plug
Jim
Last edited by the Wasp; 06-22-2020 at 03:22 PM.
I agree with Jim (wasp), try a new OS-f plug or Saito SS plug. At least you will have eliminated that as a possibility.
There is also a chance that you hit a "false peak". Sometimes when leaning the hsn there can be a place where a couple of clicks leaner seems to do nothing, no increase in rpm, so we think we have peaked the rpm when we really haven't. Then a click or two more lean past the false peak and the engine continues to gain rpm until the real peak is reached. This false peak usually occurs when the lsn needle is set way too rich.
As a rule, when attempting to find peak rpm I deliberately lean the hsn until there is a noticeable sag in rpm and then quickly richen the hsn to avoid overheating. Doing this completely eliminates the chance of settling on a false peak.
How old is your fuel?
Last edited by Glowgeek; 06-22-2020 at 06:55 PM.
Thanks guys, I've done everything including turning the needle until it sags, the only thing I can think of is the cam and since I didn't pay allot for this engine and it has great compression I think I might replace the cam, lifters and valve springs.
I'll keep you posted.
I'll keep you posted.
Thanks guys, I've done everything including turning the needle until it sags, the only thing I can think of is the cam and since I didn't pay allot for this engine and it has great compression I think I might replace the cam, lifters and valve springs.
I'll keep you posted.
I'll keep you posted.
Take pics as you progress, they speak a thousand words.
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Dwayne (06-23-2020)
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Thanks guys, I've done everything including turning the needle until it sags, the only thing I can think of is the cam and since I didn't pay allot for this engine and it has great compression I think I might replace the cam, lifters and valve springs.
I'll keep you posted.
I'll keep you posted.
I don't think it was asked or said, how long have you run the engine since replacing the bearings ?
Jim
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or ask on RC Groups for a new cam. if you do post the part number too.
Jim
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I installed one of Gary's handy works on my best looking Saito 50 GK, and began to make one of my own for some others. I lack an M-5 die, but will have one Friday.
8 mm brass, on the flats
8 mm brass, on the flats
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Dwayne (06-24-2020)