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| Breaking in a rebuilt engine https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=569 |
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| Author: | Matt [ Tue Mar 01, 2005 11:07 am ] |
| Post subject: | Breaking in a rebuilt engine |
Hi, I have a 74 CR 250 I'm finishing restoring and I was wondering if anyone has proven results on how the best way to break in a rebuilt 2 stroke. My engine has all new bearing, seals, fresh 2 over bore, and new wisco piston. Also should I start with the stock carb jetting or does it need to be changed because of the overbore. Thanks for any help, Matt |
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| Author: | tomh. [ Sat Mar 12, 2005 6:05 pm ] |
| Post subject: | |
Hi Matt! Jetting should be the same, because you haven't really changed much with the bore. This is one of those questions that have as many answers as answerers! Anyway, I ride for about 15 min at a moderate practice pace, then let the engine cool off a while. Then 15 again and a cooling session. Then 15 again and a cooling session. By then you'll want to ride it! Biggest thing is not to get it hot right away. |
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| Author: | 2five0 [ Sun Mar 13, 2005 1:14 pm ] |
| Post subject: | |
Also once you get the bike hot and let it cool down re torq the head bolts. |
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| Author: | CR250Ryan [ Wed Mar 16, 2005 8:47 pm ] |
| Post subject: | |
there is an interesting article about break-in on this site. http://mototuneusa.com/ It is a free newsletter site, but you'll have to enter your email to look around. It has a wealth of "outside the box" knowledge to check out Cheers, Ryan |
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| Author: | Matt [ Sun Mar 20, 2005 10:47 pm ] |
| Post subject: | |
I remember coming accross that article about a year ago. It seems pretty convincing by his photos. It suggests that you use a non synthetic oil to break in and seat the rings. Does anyone know a good 2 stroke oil that is not synthetic? Most of the quality race oils are all synthetic. Matt |
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