what kind of MPG are you getting? Below 30 MPG is a hint that the FPR has a problem. Next is to prop up the tank and pull the vacuum line off it. If its wet with gas, then that's another strong hint.

The full diagnostic involves using a fuel pressure gauge but most people never go that far.

 

if it's the fpr, i've got one for sale. pm me for details

 

i'm not 100% sure but i think i'm getting 30+mpg. i'll keep an eye on that and check the vacuum line too.

let you guys know what comes up.

ef: let me confirm this first. thanks for the offer.

 

I just ordered the FPR at lawnmowerpros.com. I hope it comes soon. I'll keep you guys updated.

 

just an update, haven't received the FPR I ordered..

 

just got the tracking number, my parts are on the way!! wooohooooo!!!

 

Finally, the FPR and o-ring I ordered came and I was able to replace them in my bike.












I also replaced the spark plugs and synched the throttle body with a Morgan Carbtune.








It worked very well for a week, and then the plugs got fouled up again.
I opened it up and found the #4 plug is wet with fuel.
I replaced it and the bike went smooth again.

After another one and a half week, all plugs were fouled up. I havent opened it up but i'm guessing they are soaked in fuel again.

What else could be the problem?
Did I miss anything?

Another thing - when I did the synch, all valves were level at 1.3K RPM. but when i turn off the engine, it turns out the idle is too low that i cant even restart the engine. i would do this again and again, same thing. until i just settled for a 1.4k rpm (that doesnt change even if i switch the engine on and off) but the catch is not all four valves are equal. only #1 and #4 is level with each other, as well as #2 and #3 together.


What else can I do?

 

any ideas?