betabantam Posted April 3, 2006 Report Share Posted April 3, 2006 After spending a year in the BMCA riding pre-65 i deciced to get something that stops(working brakes), bounces(suspension that moves) and weighs less than 100kg. I bought a Beta 270 from BVM Moto, yes i was getting the 200... . After 2 hours of continous riding i got a loud piston knock at top of travel. 2 Betas i was riding with had no problem. I am using super unleaded and Castrol TTS 50:1. Have not tried since to see if it happens when cold. Will try today. Where do i start?? Thanks Quote Link to comment Share on other sites More sharing options...
andy_290 Posted April 3, 2006 Report Share Posted April 3, 2006 I had a tap on my old Beta running 60:1, changed to run 70:1 with Shell Optimax and my tap disappeared. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted April 3, 2006 Report Share Posted April 3, 2006 How can you tell that the knock happens at the top of the piston's travel? Quote Link to comment Share on other sites More sharing options...
andy_290 Posted April 3, 2006 Report Share Posted April 3, 2006 By putting your finger in the spark plug hole of course Quote Link to comment Share on other sites More sharing options...
dale Posted April 3, 2006 Report Share Posted April 3, 2006 50-1 is a bit too much oil.Try 70-1. Quote Link to comment Share on other sites More sharing options...
betabantam Posted April 4, 2006 Author Report Share Posted April 4, 2006 Thanks will lean off mixture. Tried putting finger in spark plug hole but engine wouldn't start???...guess there wasn't enough spark in my finger. Took it back to BVM turns out the jet and breather pipe was blocked so both replaced FOC. Seems OK now. Quote Link to comment Share on other sites More sharing options...
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