sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Feb 20, 2012 9:28:20 GMT -5
put all new gaskets in intake! dont have a compression tester!
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Post by 90GTVert on Feb 20, 2012 9:42:22 GMT -5
New gaskets don't necessarily mean no leak. It would be a good idea to test with propane from a small unlit torch or carb cleaner sprayed around the intake/carb to see if the engine changes speed. Obviously that stuff is flammable, so be careful with it.
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Feb 20, 2012 10:12:13 GMT -5
cant get it to run long enough! it doesnt always start ! gnna put thw new carb on when i get it and go from there!i replaced all the o rings in the intake circuit also to no avail! this thing wants to run really bad !!
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Deleted
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Post by Deleted on Feb 20, 2012 11:30:37 GMT -5
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Post by Fox on Feb 20, 2012 16:42:45 GMT -5
When it dies and won't start again check to see if it has spark. I've seen situations where an electrical component (coil/stator/pickup coil/CDI) will work for a bit and then you lose spark after it gets hot. Then you let it cool off and the cycle starts over again. Just throwing out ideas.
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Feb 20, 2012 17:22:38 GMT -5
thanks Stroker! will check when i get a lil down time! by the way the name 1FASTQMB, suggests you di have a fast one ! How fast ,and what mods have you done?
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Post by Goosey on Feb 20, 2012 17:53:50 GMT -5
What Fox said. I had an intermitent spark from a faulty stator, it would start up then stall out, and it would start up again after it cooled. It gradually stalled out sooner each time, from 10 miles, to 5 minutes of warm up, Adjusting the pickup slightly on the stator seemed to help temporarily, then eventually it would not start at all. I went all over the fuel and air system til I finally got that one ( 2 problems at the same time threw me off).
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Deleted
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Post by Deleted on Feb 20, 2012 19:06:29 GMT -5
trying to get it to start to get it hot enough to check to see if it loses spark when compression has not been checked sounds like a potentially fruitless undertaking but hey what do i know lol
kind of like taking the long way around to get to your elbow lol :lol:
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sctrdawg
Scoot Enthusiast
scooter bum
Posts: 149
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Post by sctrdawg on Feb 20, 2012 19:36:19 GMT -5
yes it does !
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Post by Fox on Feb 20, 2012 22:10:19 GMT -5
trying to get it to start to get it hot enough to check to see if it loses spark when compression has not been checked sounds like a potentially fruitless undertaking but hey what do i know lol kind of like taking the long way around to get to your elbow lol  Because Jason, it's something to check that requires spending $0. There's all sorts of electrical anomalies that can happen. A lot of electrical components coming out of China are faulty before they are ever sold to the public and many more fail after a short time. Some work for a while and then they develop a symptom where they work cold and fail after you power them up for a little bit. They get hot and stop working. Goosey has had this happen and so have I so... When the scooter dies if you immediately check for spark, you can either find a problem or at least eliminate a suspect and it costs you nothing. I've been doing this stuff for a long time too and I've learned that the best course of action if you don't have all the tools is to test everything and anything you can that doesn't require you to go and buy anything first before you go spend cash on a tool. |
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Deleted
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Post by Deleted on Feb 20, 2012 22:15:27 GMT -5
its extremely hard to start which screams compression to me. If it was easy to start cold then hard or no start when hot I would agree.
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Post by 90GTVert on Feb 20, 2012 22:46:18 GMT -5
I agree a compression test is a good bet. Doesn't require starting the engine. That said, it's always good to have more ideas on what it could be.
I'm no 4T scooter pro, but I've seen some freaky stuff that is hard to diagnose in engines. Then it comes down to ideas. I had some of the country's top tuners trying to diagnose a problem with my car at one point. I went out with lists of ideas for a while from myself and these guys... Justin Burcham(JPC), Jeff Dunne(Ford Racing), Kevin ____ umm it's been a few years (Diablosport)... and they were all baffled for a bit. I was also getting ideas from local friends that race in anything from pro-street to outlaw to guys I know that are Ford certified in basically everything with more years experience than I have living. Turned out to be one of the last things any of us really thought it was.
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Deleted
Deleted Member
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Post by Deleted on Feb 20, 2012 23:13:39 GMT -5
the dang thing wants to run! it just will not out run the starter!! i got the thump thump and everything!! I am willing to put money on it being compression now. |
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Post by 90GTVert on Feb 20, 2012 23:13:41 GMT -5
Just to go over a few things, maybe to make it easier for us to keep track of what's up...
Carb has been cleaned at least 2X.
Fuel pump is working, engine is getting fuel.
Vacuum leaks have been addressed with gasket swaps, not by trying to do any sort of testing it seems.
Idle mixture has been tinkered with to no avail.
Auto enricher... sounds like it's still never really been checked.
Compression... sounds like it hasn't been checked.
Valve lash... what are they set at? Following instructions from the vid or write-up?
Valve timing was suggested... no reply.
Has spark at least initially, has not been tested when it dies I believe.
No water in the gas.
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Deleted
Deleted Member
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Post by Deleted on Feb 20, 2012 23:14:57 GMT -5
the dang thing wants to run! it just will not out run the starter!! i got the thump thump and everything!! I am willing to put money on it being compression now. Had a Tao Tao here a month ago doing the same thing turned out to have about 70 psi. |
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