Supertigre S-90 Troubles
08-05-2010, 12:22 PM
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Supertigre S-90 Troubles
I have an older supertigre s-90 mounted in a Goldberg Ultimate ARF. The engine runs fine untill the tank gets about halfway empty then the engine just wants to lean out and die. I think it is a tank problem but can't figure out what it is? No lines are kinked and the clunk is fine. The engine will continue to idle fine at this point but once full throttle is applied I can see bubbles in the carb. line and the engine will just die out untill its brought back to idle. The engine is also running on a slimline pitts so it may not be getting enough back pressure? Any tips on the above issue? Thanks!
08-05-2010, 02:44 PM
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RE: Supertigre S-90 Troubles
If it were mine, I would change ALL the plumbing from the clunk forward and then spin again. It only takes one little pin hole somewhere to screw up the fuel delivery.
08-08-2010, 09:51 AM
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RE: Supertigre S-90 Troubles
ORIGINAL: w8ye
I had this problem and there was a crack in the brass tube where it went through the stopper in the tank
I had this problem and there was a crack in the brass tube where it went through the stopper in the tank
Take care,
Butch
P.S. For the OP, yes the pitts style mufflers are notorious for not having enough back pressure. Most folks, myself included, have opted to close off one of the exhaust exits. Good luck with it.
08-08-2010, 10:52 AM
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RE: Supertigre S-90 Troubles
ORIGINAL: Jezmo
I've had the exact same thing happen Jim and it took a very long time to finally stumble upon the problem. I knew there was a leak because the bubbles couldn't get in any other way but I couldn't bring myself to believe the brass tube was the problem. I kept thinking that I was somehow damaging the silicone line when installing it or perhaps the line was defective when manufactured and was somehow porous. Lesson learned though, the brass tubing can split and that's what it did.
Take care,
Butch
P.S. For the OP, yes the pitts style mufflers are notorious for not having enough back pressure. Most folks, myself included, have opted to close off one of the exhaust exits. Good luck with it.
ORIGINAL: w8ye
I had this problem and there was a crack in the brass tube where it went through the stopper in the tank
I had this problem and there was a crack in the brass tube where it went through the stopper in the tank
Take care,
Butch
P.S. For the OP, yes the pitts style mufflers are notorious for not having enough back pressure. Most folks, myself included, have opted to close off one of the exhaust exits. Good luck with it.
Or, restrictors can be fitted to both stacks to use them both for good effect. Either neck them down with a dull bladed tubing cutter, or fit tubing inside with a smaller id than originally. These inserts can also be used to extend the stacks if necessary. Hold tubing in with JB Weld or small screws.
Regards,
Richard
