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Post by fender069 on Jul 8, 2011 15:25:14 GMT -5
I have not been able to get it to start after the BBK. i took it to a friend's mechanic and he discovered everything. He said whole top needs replaced. I took it apart after and the rocker arm assembly was missing a chunk on the side. the camshaft is bent. i haven't made it to the piston yet what does it sound like I need to replace  my reasoning: I did not have timing set right the first time and attempted to start it several times. then we finally set timing right and never took it back apart. it looked fine after we set timing. i dont know what happened |
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Post by Fox on Jul 8, 2011 15:30:11 GMT -5
Yeah the timing must have been off on the cam. You might get lucky and not need a new piston/barrel. :dunno:
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Post by fender069 on Jul 8, 2011 16:59:52 GMT -5
piston/barrel? is that just the whole piston?
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Post by 90GTVert on Jul 8, 2011 17:03:35 GMT -5
Never heard of a bent cam and busted rocker assembly front he timing being off... but then again, I've never seen anyone complain of those things yet on a scoot. Timing being off could open the valves at the wrong times and cause the piston and valves to make contact. If that's the case, you should have bent valves and likely a damaged piston on top of the afore mentioned issues. If the valves aren't bent and the piston shows no signs of contact, you'd need to look for something other than improper valve timing.
Otherwise, a timing chain issue would come to mind... if the timing chain were too short fro some reason (or the big bore kit too tall) then it would put a lot of pressure on one side.... but then I'd think the timing chain would snap long before it bent the cam or damaged anything else and you should have had one hell of a time ever getting the chain on. Highly doubt it would be that, just thinking out loud.
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Post by 90GTVert on Jul 8, 2011 17:07:02 GMT -5
Sounds like at minimum cam, rocker assembly. If it's been that stressed, I'd consider a new timing chain for peace of mind. I expect when you get farther in you may find damage to the piston and valves as I mentioned. The head would be cheaper to replace than trying to replace valves in the current head and hope the seats are OK. Look at the cylinder walls and you should have an idea if the cylinder needs to be replaced. If it's scuffed/scratched bad, then replace it. The piston is kinda the same deal. If it looks like it's damaged, replace the whole piston. Get a kit with new rings included preferably.
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Post by fender069 on Jul 8, 2011 22:17:06 GMT -5
So the rocker assembly is snapped in half. It fell apart as I removed it. The camshaft is not bent like I thought it was.
I cannot get the head off. One of the cylinder things that go on the studs is stuck, I cannot remove it. I am going to take it to a shop to be safe I guess now.
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Post by Fox on Jul 8, 2011 22:27:15 GMT -5
You don't have to remove those cylindrical locating pins. Just slide the cylinder off. It'll come off with the pins in there. This ain't rocket science bro. I know you can figure it out if you stare at it long enough after you read the BBK guide in the library.  |
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Post by fender069 on Jul 9, 2011 0:28:32 GMT -5
lol i've removed the head before. this time it really is stuck. it looks like the locating pin is bent on. one comes off just fine, just this one will not budge
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Post by Fox on Jul 9, 2011 3:07:27 GMT -5
Muscle that sh*t off! Don't let the machine punk you! ;D
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Post by 90GTVert on Jul 9, 2011 7:39:27 GMT -5
I've had the locators do that. Worst case scenario, you can try to cut it off carefully so you don't damage anything else. Sometimes I can just grab them with pliers and pull 'em off, rotating as if you are unscrewing it can help get past the threads if it's tight there.
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