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changed sprockets, now bike wont start

  • Thread starter Thread starter prem
  • Start date Start date
i put the cams back on and attached the chain. i put a wrench on the left crankshaft and i can rotate it counter-clockwise over and over(with the starter off,) but as soon as i go to move it clockwise it jams up after 1/8 of a turn. doesnt matter where the pistons are. with a wrench on the right side crank big bolt i can rotate it clockwise but wont go counter-clockwise.
 
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i timed the cams again and when i hit the starter with plugs and carbs out, everything moved around well. i will reassemble and hook everything up to be sure.
 
i just put the spark plugs back in and now the engine wont turn more than half a turn. almost a piston gets near the top and gets stuck. any ideas?
 
prem said:
i put the cams back on and attached the chain. i put a wrench on the left crankshaft and i can rotate it counter-clockwise over and over(with the starter off,) but as soon as i go to move it clockwise it jams up after 1/8 of a turn. doesnt matter where the pistons are. with a wrench on the right side crank big bolt i can rotate it clockwise but wont go counter-clockwise.
Click to expand...

prem said:
i timed the cams again and when i hit the starter with plugs and carbs out, everything moved around well. i will reassemble and hook everything up to be sure.
Click to expand...

prem said:
i just put the spark plugs back in and now the engine wont turn more than half a turn. almost a piston gets near the top and gets stuck. any ideas?
Click to expand...

It sounds like multiple things are being changed at the same time and that you're taking a shotgun approach rather being methodical. Either that or I'm just too dumb to extrapolate the missing parts from your description of work done.

Now if I understand this right, you turned the engine over without spark plugs and without carbs. Then you put all of them back on, and now the engine locks. I cannot imagine anything else than a flooded cylinder if these are the only things that have been changed. And that can only be caused either by f$!ked-up carbs or by confusing the vacuum and fuel line (been there).

(This is all assuming you're able to distinguish compression vs. lock, but given by all the things you've done already anything else would be surprising).
 
roeme said:
It sounds like multiple things are being changed at the same time and that you're taking a shotgun approach rather being methodical. Either that or I'm just too dumb to extrapolate the missing parts from your description of work done.

Now if I understand this right, you turned the engine over without spark plugs and without carbs. Then you put all of them back on, and now the engine locks. I cannot imagine anything else than a flooded cylinder if these are the only things that have been changed. And that can only be caused either by f$!ked-up carbs or by confusing the vacuum and fuel line (been there).

(This is all assuming you're able to distinguish compression vs. lock, but given by all the things you've done already anything else would be surprising).
Click to expand...

Totally with you on this. With respect to the OP, many folk rush in without thinking methodically about the problem. Troubleshooting a problem (in any endeavour) requires a carefully thought out understanding of the BASE issue, then formulating a logical plan to solve it! And if you can't figure out the issue, then ASK others who may/will have more experience/knowledge before leaping in!!

That kinda sounds a bit "flowery" but it's true!

Download the Service Manual as well, if you haven't done so already.
 
i appreciate all the help i can get. i went in not fully knowing what i was looking for. i had taken the top of the head off so i could see the top of the pistons. i cleaned that all up. it seemed that the pistons werent warped when i did a hydrolock depth test.
 
Is there someone that is nearby that can go look and see what is going on? Seems like we're not getting anywhere with remote tech support. It wouldn't be difficult for someone not familiar with working on bikes to make a mistake that would be catastrophic and make all this more costly and difficult to fix. As for the hydrolock test, it's purpose is to determine if you have a bent connecting rod. I've not heard of a warped piston before. That doesn't mean it can't happen....just never heard of it. I also wonder how much marvel mystery oil was in the cylinders when he attempted to start the engine.
 
i found out the problem. my cam sprockets/chain were worn and it kept skipping out of time. this happened when i got it back together and i saw the rocker arms sheer off and fly when i had the valve cover off and was trying it out. thank you everyone for the help.
 
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