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| 1980 cr250 port work wanted, any recomendations? https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2425 |
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| Author: | montywa [ Mon Jul 13, 2009 11:12 am ] |
| Post subject: | 1980 cr250 port work wanted, any recomendations? |
I picked up a spare cylinder and head for my CR and was hoping to get it worked over before i sent it off for chrome and piston. I race this bike regularly and was hoping you guys knew of a good porter with experience with these motors who could do a mild port job on my cylinder. Thanks! |
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| Author: | FTE [ Wed Jul 22, 2009 11:51 am ] |
| Post subject: | Re: 1980 cr250 port work wanted, any recomendations? |
You could always go with the factory specs for the center port barrel off of Tripes's bike that was claimed in 79 and broken down by cycle. I suspect any decent port guy could replicate it. http://www.vintagefactory.com/Cycle6.jpg Then maybe top it off with an "E" series ignition set up from the 79 bike, which is what Tripes ran. |
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| Author: | montywa [ Fri Jul 24, 2009 9:30 am ] |
| Post subject: | Re: 1980 cr250 port work wanted, any recomendations? |
hmmm, i dont have a 79 ignition. I actualy dont want to make a top end ported out motor either, i was just hoping to find someone with a decent amount of experience with the 78-80 motors that could clean up my spare cylinder before i had it re-plated. |
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| Author: | redrocket190 [ Sat Jul 25, 2009 8:33 am ] |
| Post subject: | Re: 1980 cr250 port work wanted, any recomendations? |
I have a CR500R and on the http://www.bannedcr500riders.com forum, Glen Howell gets great reviews. I discussed doing a clean-up on my '79 CR250R cylinder - particularly addressing some mis-matching between the ports and the sleeve. Not done the work yet. GSS Race Porting Palmdale, CA (661) 609-9272 Glen Howell mailto:gssraceporting@aol.com Much further back I had a conversation with Sam Alexander - who I contacted via Jastco. He will do major porting work and carb mods to make the CR250R and 40 HP 104 octane-only engine. I am sure he'd do minor work, too. The John Astleford Company 2146-E/F West Park Court Stone Mountain, GA 30087 USA Phone 770-469-3926 Fax 770-469-3926 Hope this helps. |
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| Author: | montywa [ Mon Jul 27, 2009 7:59 am ] |
| Post subject: | Re: 1980 cr250 port work wanted, any recomendations? |
Thank you very much!! i will run these leads down this week!! |
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| Author: | Mikeee P [ Wed Sep 02, 2009 2:29 am ] |
| Post subject: | Re: 1980 cr250 port work wanted, any recomendations? |
http://www.EricGorr.com is a great and inexpensive place for porting work, crankshaft rebuilding, head mods etc... Eric is one of the premier tuners in the United States/World and has bikes racing the Nationals, Supercross and GP's in Europe. He's also very economical too... He doesn't just lop 20,000ths or 30,000ths off your head, he can redesign the squish band, alther the porting in the cylinder to suit your needs etc... A trick or "poor mans" tip is to take about 20,000ths off the head, and then run two base gaskets. It lifts the exhaust port giving more upper midrange and top end, and the milling increase the compression or returns the compresion so that the bike still pulls down low. Peace... Mikeee P |
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