Originally posted by GoldFinger
PLs check again the crank timing, if this feel weird for you, just measure (use caliper please) the widht of both crank opening. Its a square hole below the carb that acts like rotary valve.
If it within 2-3mm diff., should be OK. But if more than that you have a problem. It will be difficult to tune the engine properly if port and crank timing does not match.
Try to alter this parts:
- Pipes, use turbo dont use EFRA one
- Shorten the pressure line (pipe to tank)
- Use hotter plugs
- tighten your clutch
Reset the carb to factory standard and tune again from rich to lean.
From your description, your engine is having a "fake" top end mixture. It was to rich low and mid mixture so in the beginning of full throtle the fuel left in the crank is still enough to supply. But the truth in the end is too lean.
I solve my tuning problem backthen after i read this theory from parisracing site. Spend some of your time to browse there, it will make your (RC)life easier.
Try to learn how to "read" your plug, this is the ultimate and easiest thing to do if you want to know how health is your engine.
Have Fun!
Bad news!
my crankshaft got broken!!! cut into 2
i don't now what happened, what i know is my setting is still rich and i don't abuse my engine by pulling the throttle in a long time, not to mention that our track is small so there are no long straights. it's the 2nd time i encountered this. the same problem the same engine where i first broke the original crankshaft, now it happened again. i know there is something i'm doing wrong, i just know what that is.......
