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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve piston clash
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<blockquote data-quote="davidjoyner" data-source="post: 52694" data-attributes="member: 1156"><p>Help. It all started with a broken valve seat - rear inlet. Had the heads redone and put it all together and ran for about 200miles. Hard to start so checked and found about a 16th to eigth valve clearance and assumed oil feed problem and something worn. Stripped the timing chest all OK. Heads off looked all OK. Re-assemble ...grrr. and rode for another 200 miles- the last 3 miles on one cylinder - incidentally sounds like a comet but with the power of an allotment wheelbarrow!</p><p>This time the rear exhaust tappet adjuster stripped, well they were due for replacement so in goes a new one. Set the clearance on TDC power stroke and NOW as you crank the swinish thing over the exhaust valve touches the piston and it locks up. Have to back off the tappet adjuster about a 16th to clear.</p><p>Haven't touched valve timing - bikes been running for 200 miles WHAT am I doing wrong??</p></blockquote><p></p>
[QUOTE="davidjoyner, post: 52694, member: 1156"] Help. It all started with a broken valve seat - rear inlet. Had the heads redone and put it all together and ran for about 200miles. Hard to start so checked and found about a 16th to eigth valve clearance and assumed oil feed problem and something worn. Stripped the timing chest all OK. Heads off looked all OK. Re-assemble ...grrr. and rode for another 200 miles- the last 3 miles on one cylinder - incidentally sounds like a comet but with the power of an allotment wheelbarrow! This time the rear exhaust tappet adjuster stripped, well they were due for replacement so in goes a new one. Set the clearance on TDC power stroke and NOW as you crank the swinish thing over the exhaust valve touches the piston and it locks up. Have to back off the tappet adjuster about a 16th to clear. Haven't touched valve timing - bikes been running for 200 miles WHAT am I doing wrong?? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Valve piston clash
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