Greetings:
Yes, there's likely an oily mess if a seal is weak at high RPM. By no means is this the only possibility. Obstructions to high flow that don't affect idle and low-speed operation can include intake, carb fuel obstructions - even a fuel filter - and exhaust crud. Another hunch based on personal experience; if there's a vacuum-operated fuel valve of any sort, make sure it doesn't close when throttle is wide open. Good luck.
I am stumped... Suzuki FA50 problems please help
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- Wheelman-111
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Re: I am stumped... Suzuki FA50 problems please help
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Re: I am stumped... Suzuki FA50 problems please help
There is no leakage of any kind coming from the engine, I have a new and extremely clean carb and the exhaust is unclogged. The fuel valve is one that only flows when engine is running but does have a ÔÇ£primeÔÇØ position which lets the gas flow when it isnÔÇÖt running and that position doesnÔÇÖt change the problem.Wheelman-111 wrote:Greetings:
Yes, there's likely an oily mess if a seal is weak at high RPM. By no means is this the only possibility. Obstructions to high flow that don't affect idle and low-speed operation can include intake, carb fuel obstructions - even a fuel filter - and exhaust crud. Another hunch based on personal experience; if there's a vacuum-operated fuel valve of any sort, make sure it doesn't close when throttle is wide open. Good luck.
Re: I am stumped... Suzuki FA50 problems please help
So we're back to electrical issue and main jetting.
- Did you check the plug wire and cap? On some caps, the underside of cap (that attaches to plug) has a metal part that unscrews... contains a resistor, and can corrode. Again, quick to check. Any sort of corrosion on these parts can create a sort of low-pass filter that keeps the engine from running at higher RPMs while not impacting idle.
- Do you have a larger main jet you can install to see if this clears up issue? Something 5 - 10 pts higher than current? Or an extra jet you can drill out to next size up? What you describe sounds like extreme lean bog at higher RPMs.
- You have the factory airbox and element... right? B/c that will cause lean bog as well. Just looked at the factory filter box... looks like a foam insert. Did you check it for rot?
Past that, agree carb is probably clean or it wouldn't idle. Reed valves would impact idle / mid-range, likewise air leaks. I'll take your word for clean exhaust, and assume you checked the exhaust port for plugging.
- Did you check the plug wire and cap? On some caps, the underside of cap (that attaches to plug) has a metal part that unscrews... contains a resistor, and can corrode. Again, quick to check. Any sort of corrosion on these parts can create a sort of low-pass filter that keeps the engine from running at higher RPMs while not impacting idle.
- Do you have a larger main jet you can install to see if this clears up issue? Something 5 - 10 pts higher than current? Or an extra jet you can drill out to next size up? What you describe sounds like extreme lean bog at higher RPMs.
- You have the factory airbox and element... right? B/c that will cause lean bog as well. Just looked at the factory filter box... looks like a foam insert. Did you check it for rot?
Past that, agree carb is probably clean or it wouldn't idle. Reed valves would impact idle / mid-range, likewise air leaks. I'll take your word for clean exhaust, and assume you checked the exhaust port for plugging.
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Buy air filters and gaskets here (Ebay): http://stores.ebay.com/noiseguysstore
Buy air filters and gaskets here (Amazon): www.amazon.com/shops/spreepower
Buy a t-shirt here: https://teespring.com/stores/spree-powersport-products