New Magnum 91 F/S impressions: valve clearances?? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-14-2004, 07:17 PM   #1
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Re: New Magnum 91 F/S impressions: valve clearances??

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I have 2 of them
real sweet engines one has over 100 flights the other maybe 25
in a super aeromaster and a t/f corsair
the feeler guage for the saito is ok
MAAC 5057 L
Jean. C. Blouin
CFI Club Aeromodeliste de l`Estrie
Skype jean.blouin
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Old 01-17-2010, 09:50 PM   #2
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Smile New Magnum 91 F/S impressions: valve clearances??

I have just acquired and broken in a Magnum XL91RFS four stroke. So far so good. More details to follow.

HELP: No info included on valve lash settings. I adjusted them with my Saito 72 feeler gauge and it seems fine, but if you have setting info on this engine, please post for us all.

Initial impressions: Not bad.
I read a lot of mixed info on the sites re. loose bolts and air leaks, so decided to go through the engine carefully before starting. All bolts were tightened down well from the factory. I used blue loctite on a few around the carb area as there have been reports of things coming loose. I also spread a thin coating of permatex hi temp silicone gasket maker on the rocker arm cover (no gasket supplied), on the intake manifold gasket face, and the carb barrel o-ring where it fits into the manifold. I put a bit of wheel bearing grease on the hi speed needle valve, covering the threads and the small o-ring, just to prevent air leaks in this area.
Break-in per instructions went well. No surprises. Putting a tune on it after an hour's run-in, I got 9800RPM on an APC 14-6 with 10% castor/syn. fuel, to which I added a splash of Klotz Benol for safety. I am riching it up to 9 or so for first flights. Idle seems reasonable on the bench..can hold 2500 no problem, and 2200 is stable. Once it's dialed in a bit more on the mixture screw, I think it will be set around 2200 for reliability.
So far, it seems to be a good one. 2 year warranty... not bad. $139 USD price..awesome.
To be seen: lifespan. Anyone got any comments on longevity?
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