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| 1979 yz400 https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=28&t=2668 |
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| Author: | todd25 [ Sun May 02, 2010 3:13 pm ] |
| Post subject: | 1979 yz400 |
I have a 1979 yz400 that i just rebuilt, but it will not start cold unless you put fuel in the cylinder. once you have had it running it will restart first try. any ideas? thanks Todd |
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| Author: | Jahimbi [ Mon May 10, 2010 1:45 pm ] |
| Post subject: | Re: 1979 yz400 |
You may have slightly low compression. If that were the case, it could make it difficult to suck fuel through the carburetor into the cylinder when using the kick starter. Have you tried bump starting while it's cold? I would recommend checking the compression and see if it is up to spec. |
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| Author: | todd25 [ Mon May 10, 2010 3:05 pm ] |
| Post subject: | Re: 1979 yz400 |
haven't tried bump starting but will check compression again. the bike has a new top end. |
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| Author: | tater [ Mon May 10, 2010 5:59 pm ] |
| Post subject: | Re: 1979 yz400 |
hi, would also do a leak down preasure test. the bottom end seals and bearings could be bad,terry |
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| Author: | todd25 [ Tue May 11, 2010 1:50 pm ] |
| Post subject: | Re: 1979 yz400 |
will give that a try thanks. |
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| Author: | jamesjohn012 [ Tue Nov 16, 2010 11:22 am ] |
| Post subject: | Re: 1979 yz400 |
Once check the compression and pressure and can get good result... |
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