I hadnt had any problems with it untill 2 meetings ago when i lost a chain on sat practice. it wrapped round the axle and sprocket carrier, bending them.i put a new carrier on and straightened axle best i could with a hammer but it threw a chain in 1 heat and in the final. for the last meeting i put new axle, engine sprocket, chain, rear sprocket and carrier on but i lost my chain in first 2 heats! (no sat practice as working). anyway i put my 2nd engine on for last heat and final and chain was fine. after further inspection at home and talking to my engine builder there is a tight spot in the chain when that engine is on. my builders got my engine now but we think it is probably the crank alignment. now the mention it chris there is some juddering under braking on the jkh.
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