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Kasama Srimok 90 > Motor keeps getting hot - any clue?
 
 
Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum		I got the following problem on my Srimok 90:


The motor keeps getting hot (140-160° C - with 10-15° C air temperature). Iīve already tried two brand new OS 91 HZ-PS with two different mufflers (Align 90 and Youngblood MP6-90). Even with the mixture set to rich and very rich the motor temperature will not stay o.k. The headspeed always starts to increase after some time and I am afraid to ruin the motor.

As this is not my first glow heli I think that I built my Srimok correctly. Does anyone have a clue what to do? Is the fan-system on the Srimok not good enough?
10-30-2009 07:38 PM
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fr8brkr
Veteran
Location: Asheville,NC

My Posts This: Topic  Forum		I can assure you that the fan system more than adequately provides cooling on my YS91SR and I have not heard of any other's suggesting a fan cooling problem. Unfortunately, aside from proper tuning I cant imagine why you are having excessive heating.

Problems ? -- Mine are flown in fresh daily
10-30-2009 07:48 PM
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speedys4
Heliman
Location: Beaverton, OR

My Posts This: Topic  Forum		I had the same issue with my engine leaning out. Make sure that you don't over tighten the 2 2.5mm bolt that hold the fuel tank plastic cap.

Picture of the cap:


Mine was really tight where it restrict the amount of air going in to the tank where it needed to pressurize the tank. You can test it by blowing into the pressure inlet while loosing the 2 screws to see if you can feel any difference.

Cheers
10-30-2009 08:00 PM
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fr8brkr
Veteran
Location: Asheville,NC

My Posts This: Topic  Forum		Thats a great idea to check ! I know of one other instance where someone mentioned that. Sorry I didnt think of it at the time.

Problems ? -- Mine are flown in fresh daily
10-30-2009 08:12 PM
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Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum
Quote 
Make sure that you don't over tighten the 2 2.5mm bolt that hold the fuel tank plastic cap.

Just checked and ----ooops---- my screws are overtightened on the tank. Thanks very much for your advise. I think Iīll need an new cap and then will try again.
10-30-2009 08:29 PM
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speedys4
Heliman
Location: Beaverton, OR

My Posts This: Topic  Forum		Good to know Niggo.

Let us know when you get a chance to fly again to see if the issue still exist or not.
10-30-2009 08:37 PM
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Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum		Iīve just ordered new tank, seal rubber and plastic cap and will change the tubing too (just in case). I shurely will let you know if that solved the problem. Canīt wait to see my Srimok back in the air. Itīs really a nice bird...

Best regards
Niggo
10-30-2009 09:28 PM
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fr8brkr
Veteran
Location: Asheville,NC

My Posts This: Topic  Forum		The best 90 I have owned to date !

Problems ? -- Mine are flown in fresh daily
10-31-2009 12:49 AM
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wreckless
Heliman
Location: Colombia S.A.

My Posts This: Topic  Forum		Tank pressure inlet Screws

Niggo:
Why donīt just unscrew the pressure inlet instead of buying everything again.....I was planing just unscrewing to see if my
leaner engine reaction after a minute of flying will desapear..
Wreckless
11-07-2009 03:22 AM
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Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum
Quote 
Why donīt just unscrew the pressure inlet instead of buying everything again.

īCause I had overtightened one of the two screws. Little cuts in the tubing (even if not visible at first sight) sometimes can be an issue too. So Iīll change that too as this costs only some Euros. I ordered the tank just in case it got demaged while being pressed into the frame (that pia-procedure).

Best regards
Niggo
11-08-2009 09:01 PM
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Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum		Iīve changed the tubing, the seal rubber and the plastic cap. Now thereīs too much pressure on the tank. But due to heavy winds in Germany I wasnīt able to test properly yet. Iīll try with loosened screws next time.
11-18-2009 02:43 PM
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Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum		The pressure in the tank came from the new inner plastic cap I had put in. It hadnīt got a hole in the nipple where you put the fuel tube on.

Therefore I drilled in a hole so that the pressure is alright now. But ..... the motor still keeps leaning out and gets hot. I run out of clues..

BTW: Iīve mailed Mr. Kasama on that matter but didnīt get any reply.
11-20-2009 04:36 PM
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fla heli boy
Veteran
Location: cape coral, florida

My Posts This: Topic  Forum		it sure sounds like a fuel system problem to me. More like an air leak if your mixture keeps changing.

"go with God son......and a bag full of guns"
11-20-2009 04:51 PM
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Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum
Quote 
More like an air leak if your mixture keeps changing.

But where?
11-20-2009 04:58 PM
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alfred
Veteran
Location: Australia, New South Wales, Mid North Coast

My Posts This: Topic  Forum
Quote 
But where?
Depends on the engine.
Check carby to crankcase seal
All "O" rings on main/mid/idle needles
leakage on carby fuel nipple
swarf/dirt in the carby passages
If muffler pressure is used, is the pressure nipple on muffler partially blocked or gets blocked with oil when running?
Over compressed
loose head bolts
11-23-2009 01:23 PM
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Kasama Srimok 90 > Motor keeps getting hot - any clue?
 
 
Niggo
New Heliman
Location: Germany

My Posts This: Topic  Forum		All items are o.K. Motor and muffler have already been changed too. No faults here.

Iīve just added a header tank to sort out, if that will help. But due to heavy rain in Germany no chance for testing at the moment. Iīm wondering, if the pressure tubing on the bottom of the OS 91 PS can be an issue, as that needed to be changed on the Srimok (Kasama adds a special carbon-bracket for the 91 pump-version), because of the special frame-bottom layout.

If I had a carb nipple, I would take off the pump and regulator and tried the motor non-pumped
NEW 11-23-2009 04:27 PM
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Ace Hobby . Esprit Model . Thunder Power RC

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Kasama Srimok 90 > Motor keeps getting hot - any clue?
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