I bought a new F4.6 from Jennys RC.
The first couple tanks of break in seemed fine, except it was idling a little high. On the 3rd tank of break in, it was idling very high and I had to turn the lsn out a full turn and narrow the idle gap to like .5mm to get it to not turn the wheels.
After that 3rd tank, I stripped the engine and carb and found everything to be in good condition. No torn o-rings. Everything looked pretty much new. So I put it all back together, only to realize the fuel tank has a decent crack in the bottom.
I bought new fuel tank and lines, but it didn’t change anything, still idling really high unless I narrow to a tiny idle gap and set the lsn super rich.
Other things to note:
- it is only running lean on the low side. The hsn is at factory and I’ve even turn it in a bit and produces lots of smoke and sounds great when I open up the throttle.
- i see some air bubbles in the fuel line from time to time
- the engine primes and starts easily
- doesn’t seem to be anything wrong with my throttle linkage or servo.
- i’m running a brand new stock exhaust, header, coupler, and header gasket.
- i’m using a brand new gallon of vp 20% fuel.
- i’m running the r5 hpi plug that came with the engine.
I’m not sure what else I could do besides buy a new carb or trying sealing the carb/engine. I know a lot of people recommend sealing the carb/engine, but there’s also a lot of people that do not recommend it. I’d rather not seal the engine, but I might have to try it if I can’t figure out another solution.
Any and all thoughts/ideas are appreciated.
The first couple tanks of break in seemed fine, except it was idling a little high. On the 3rd tank of break in, it was idling very high and I had to turn the lsn out a full turn and narrow the idle gap to like .5mm to get it to not turn the wheels.
After that 3rd tank, I stripped the engine and carb and found everything to be in good condition. No torn o-rings. Everything looked pretty much new. So I put it all back together, only to realize the fuel tank has a decent crack in the bottom.
I bought new fuel tank and lines, but it didn’t change anything, still idling really high unless I narrow to a tiny idle gap and set the lsn super rich.
Other things to note:
- it is only running lean on the low side. The hsn is at factory and I’ve even turn it in a bit and produces lots of smoke and sounds great when I open up the throttle.
- i see some air bubbles in the fuel line from time to time
- the engine primes and starts easily
- doesn’t seem to be anything wrong with my throttle linkage or servo.
- i’m running a brand new stock exhaust, header, coupler, and header gasket.
- i’m using a brand new gallon of vp 20% fuel.
- i’m running the r5 hpi plug that came with the engine.
I’m not sure what else I could do besides buy a new carb or trying sealing the carb/engine. I know a lot of people recommend sealing the carb/engine, but there’s also a lot of people that do not recommend it. I’d rather not seal the engine, but I might have to try it if I can’t figure out another solution.
Any and all thoughts/ideas are appreciated.
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