robm Posted March 31, 2008 Report Share Posted March 31, 2008 A couple of weeks ago the engine developed a knocking during the afternoon session after a fill up. I put it down to dodgy fuel so drained it all out and changed the plug. Next trial no knocking and allseemed well. Yesterday it started to do it again... after lunch, it also seemed to be hunting a bit on tickover, which I thought could mean she's running a bit lean, but it does seem to be one of the more 'smokey' bikes despite being run on EXACTLY 70:1 (use syringe to measure) Any thoughts guys ? Rob Quote Link to comment Share on other sites More sharing options...
tilertrialler Posted March 31, 2008 Report Share Posted March 31, 2008 i had this when i used standard unleaded petrol, i run 70.1 with super esso unlesded it stopped it knocking, try this first. Quote Link to comment Share on other sites More sharing options...
mikee Posted March 31, 2008 Report Share Posted March 31, 2008 Could be the left hand side crank seal that on its way out if it seems over smokey. Quote Link to comment Share on other sites More sharing options...
paul w Posted March 31, 2008 Report Share Posted March 31, 2008 (edited) when you say "knocking" do you mean a mechanical knock or a ping type sound as in pre-ignition? if the latter try a de-coke of the piston crown and the head, if the noise persists try checking the float level, then one size bigger on the pilot jet (you will need to re-set the air screw when the bike is hot). i know from experience that these can be a pain to set up on the carb. good luck, hope this helps. paul. Edited March 31, 2008 by paul w Quote Link to comment Share on other sites More sharing options...
robm Posted April 1, 2008 Author Report Share Posted April 1, 2008 Cheers for the replies, will try the esso, followed by whipping the head off, and if its still doing it after that, i'll start on the carb! Rob Quote Link to comment Share on other sites More sharing options...
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