bob654 Posted January 26, 2022 Share Posted January 26, 2022 Hi, thanks in advance. I am rebuilding my bike after getting the head skimmed, 9 thou. Got as far as putting the rebuilt head back on the bike today, put the cams back on and bolted down, replaced the pully wheel. I turned over by hand a few times today before stopping, (limited to daylight work,) and there seems to be a tight lobe, Its always the same spot on the cycle. Exhaust, number 1 cylinder. I wonder where to start in the morning? Check the shim? Is it normal to have a spot that is tighter? Quote Link to comment
TonyGee Posted January 26, 2022 Share Posted January 26, 2022 check the valve clearance first, then check cam timing. Quote Link to comment
bob654 Posted January 26, 2022 Author Share Posted January 26, 2022 Cheers, will do. The head skim shouldn't effect the valve clearance, eh? I checked the cam timing about 10 times today, so will check again. That only leaves, me mixing my shims, when they were off., and I didnt think I did? Oh well fresh start in the morning. Quote Link to comment
bob654 Posted January 26, 2022 Author Share Posted January 26, 2022 I will check all my buckets are moving too. Quote Link to comment
Swiss Toni Posted January 26, 2022 Share Posted January 26, 2022 The old habit of making sure everything turns nicely at each stage of a rebuild, makes it a lot easier to locate the cause of said 'stiction'! 3 Quote Link to comment
bob654 Posted January 26, 2022 Author Share Posted January 26, 2022 Would not, having the cam chain tensioner installed have anything to do with this? Quote Link to comment
TonyGee Posted January 26, 2022 Share Posted January 26, 2022 18 minutes ago, bob654 said: Would not, having the cam chain tensioner installed have anything to do with this? you don't want to turn an engine over with no tensioner fitted Quote Link to comment
bob654 Posted January 26, 2022 Author Share Posted January 26, 2022 Just hand turn so far. Quote Link to comment
TonyGee Posted January 26, 2022 Share Posted January 26, 2022 5 minutes ago, bob654 said: Just hand turn so far. no !!! never turn the crank till the tensioner is fitted and the cam timing is checked. 1 Quote Link to comment
bob654 Posted January 27, 2022 Author Share Posted January 27, 2022 Right, had another go this morning. Tensioner installed, first, checked the timing and I was off one cog between cams. Now she turns smoothly all the way round. Thank you. 3 Quote Link to comment
TLRS Posted January 27, 2022 Share Posted January 27, 2022 19 hours ago, TonyGee said: no !!! never turn the crank till the tensioner is fitted and the cam timing is checked. Go on, spill the beans? Will there be enough play in the timing that pistons could hit valves without a pensioner? Quote Link to comment
Gixer1460 Posted January 27, 2022 Share Posted January 27, 2022 1 hour ago, TLRS said: Go on, spill the beans? Will there be enough play in the timing that pistons could hit valves without a pensioner? Without the chain being tensioned, there is the easy possibility of the chain skipping a tooth - as seems to have happened here! 3 Quote Link to comment
cnap504 Posted January 27, 2022 Share Posted January 27, 2022 4 hours ago, Gixer1460 said: Without the chain being tensioned, there is the easy possibility of the chain skipping a tooth - as seems to have happened here! Yep^^ so when it’s running might be a good idea to do a compression test 1 Quote Link to comment
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