No compression
#1
04-09-2018, 08:42 PM
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No compression
I have a 93 Yamaha Warrior 350 and I have 0 compression. The piston and rings we changed. It’s on tdc I have spart on the plug I have a new carb. It was running and smoking unit my son replaced the piston. Could it be the heads or the timing chain. I’m lost I would like some help or suggestions if possible.
#2
04-10-2018, 04:11 AM
Check the valve clearances at TDC on the compression stroke. If they are OK check valve timing. If it is OK now, he may have got it wrong, then righted it after the piston hit a valve and bent it. Either way the head is going to have to come off to check head gasket was OK, valves for being bent, and rings for not being the right ones, or scoring the bore for some reason.
#3
04-10-2018, 07:53 AM
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#4
04-10-2018, 11:19 AM
Tell me more about the "piston replacement"...did he just throw in a new piston or did he send the cylinder out to have it bored and have piston/rings matched to it?
Head - not sure what your skill level is, but I'd pull it apart and clean/inspect everything...
Cam - ensure the lobes are in good shape and within spec...
Head - not sure what your skill level is, but I'd pull it apart and clean/inspect everything...
Cam - ensure the lobes are in good shape and within spec...
#5
04-10-2018, 11:40 AM
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No compression
when my son got the bike they gave him a box that had the new piston and rings along eith the gaskets. Him and a friend put them on and all went diwn hill from there. I believe they messed up the valves but its hard me me to say im not good at mechanics i tild him go search for a new cylinder head. They installed a new cam chain
#6
04-10-2018, 11:54 AM
Take the head to a shop and have them grind the valves and install new valve seals in it buy a new top end gasket kit. pull your jug and piston and take that in to get measured. if the jug specs out with the piston sixe hone it a little for new cross hatches and put a new set of rings in it.
#7
04-11-2018, 08:47 AM
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#8
04-11-2018, 08:56 AM
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#9
04-23-2018, 07:09 PM
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Timing
Thanks for all the help and input about not having any compression. That issuers was resolved the woodruff key was slipping and finally broke. Now my issue is that my warrior 350 starts fine when I have the choke when I turn the chicke off it shuts down I’d i give it gas it hesitates. What could that be the carb is new
#10
04-24-2018, 06:31 AM