Doc's Anything Goes
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engine dead
by: tvnacman - Jun 16, 2011 18:00:19 GMT -6
Post by tvnacman on Jun 16, 2011 18:00:19 GMT -6
so on my way to work , I merged on wot started to get up to top end . all was great quick fart stall , walked it to the shoulder tried to start it the flywheel spins and it sounds like no compression . I'm thinking I broke the timing chain . what do you guys think and how far into it will I have to go and in what order .
Thanks
John
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Scooter Doc
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Post by Kaveman on Jun 16, 2011 18:16:04 GMT -6
spins freely ? What engine type ? 150 ? Broken timing chain means bent valves . Only way to truely find out what happened to it is to disassemble the engine . Could be piston issue if head is ok.
Bill C.
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engine dead
by: sprocket - Jun 16, 2011 18:37:08 GMT -6
Post by sprocket on Jun 16, 2011 18:37:08 GMT -6
Pull the spark plug, stick your finger over the hole and try and start the engine... it should blow your finger off the spark hole with some force...
Other than that, you need to pull the head... good time for a Big Bore Kit
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Doc's Anything Goes
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engine dead
by: tvnacman - Jun 16, 2011 18:47:30 GMT -6
Post by tvnacman on Jun 16, 2011 18:47:30 GMT -6
i can tell its just spinning , with no compression it sounds like a drill spinning
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engine dead
by: sprocket - Jun 16, 2011 18:53:37 GMT -6
Post by sprocket on Jun 16, 2011 18:53:37 GMT -6
Could be the start clutch is gone...have you tried to kick start it? This bypasses the starter ...
If you can kick start it, and it has compression/resistance the engine is probably OK.
What a bummer John...
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Doc's Anything Goes
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Post by tvnacman on Jun 18, 2011 5:12:44 GMT -6
I see the flywheel spinning , I would think if it is the starter clutch , I just would have lost the electric start , not stalled out on the hwy . I'm going to pull the valve cover and crank to see if the cam and valves move .
this is my busy time with air conditioning service . If there would be a place to bring the scooter to, I would pay to have it taken care of, it may have to wait till the end of air conditioning season .
John
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Doc's Anything Goes
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Post by tvnacman on Jun 18, 2011 5:17:59 GMT -6
it is a 150cc with 13" wheels
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Post by Bashan on Jun 18, 2011 6:35:52 GMT -6
Well, that's true John, if the flywheel is turning the crank is turning; so the starter is engaging. A guy had his connecting rod and a ring go not too long ago and it made a hellatious clatter when he cranked it so I'm thinking timing chain. I've never had that experience on a scooter but a motorcycle I had snapped one and it turned with the starter just like you are describing. I think you have a good plan pulling the valve cover and looking......John? John? Where the hell are you? Oh, out on an AC call huh? 
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Doc's Anything Goes
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engine dead
by: tvnacman - Jun 18, 2011 12:15:59 GMT -6
Post by tvnacman on Jun 18, 2011 12:15:59 GMT -6
this is what I found , timing chain is good . i1214.photobucket.com/albums/cc483/tvnacman/IMAG0241.jpgso what do you guys think broken connecting . if so what do you think new piston, rings , connecting rod , do you guys think the cylinder walls are scratched ? should I just go for a new head piston the works . The big bore kit sounds interesting the problem is I have no self control , my throttle has two positions wot or none . With the hot weather I'm thinking I will burn it out very fast . John |
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Doc's Anything Goes
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engine dead
by: tvnacman - Jun 18, 2011 14:30:35 GMT -6
Post by tvnacman on Jun 18, 2011 14:30:35 GMT -6
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Doc's Anything Goes
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engine dead
by: tvnacman - Jun 18, 2011 14:45:31 GMT -6
Post by tvnacman on Jun 18, 2011 14:45:31 GMT -6
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engine dead
by: sprocket - Jun 18, 2011 14:55:18 GMT -6
Post by sprocket on Jun 18, 2011 14:55:18 GMT -6
WOW bad meltdown...
I would replace the whole top end, cylinder, head and timing chain and piston etc...
The only other alternative which will cost more but get you running quicker is to buy a complete 'crate' engine
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Doc's Anything Goes
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engine dead
by: tvnacman - Jun 18, 2011 15:12:15 GMT -6
Post by tvnacman on Jun 18, 2011 15:12:15 GMT -6
I had no warning , just before getting on the hwy it was running strong , the idel seemed like it was high it was a cool morning 65 and dry
John
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engine dead
by: sprocket - Jun 18, 2011 15:34:39 GMT -6
Post by sprocket on Jun 18, 2011 15:34:39 GMT -6
To have that kinda drastic effect your engine must have been running very, very lean John...
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Post by Cruiser on Jun 18, 2011 16:00:48 GMT -6
Your original cam and rockers should be OK. This looks like a case of pre-ignition probably caused by an over lean condition. I believe the links you posted are wholesale or dealer prices only. Ordering "a la carte" from MonsterGY6 came up with THIS.A stock top end with shipping for $135.90. Or this from Scrappydog for $20 less. Check our banner vendors first. You can usually get a very good deal and some give forum member discounts. |
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