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General Discussions & Announcements General Announcements, General Questions, e.g. What bike do I buy?, etc. |
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#21
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You were quite correct in your 250-300 statement above. Re: the "275" gasser. We made several 274cc Gassers out of 250cc bikes. We would take a cylinder slated for repair, and send it, the head, and a 14th oversize Wiseco piston built for the TRX250R Honda quadracer to the cylinder repair business. They would bore the cylinder to work with the oversized piston, and then coat the cylinder bore with their version of "nikasil" and hone the cylinder to match the piston for proper clearance. They would build up and then machine down the head to match the new bore. The piston kit we used was the Wiseco 526M06950. You can tell by the designation that it has a 69.5mm diameter, instead of the normal GG 250 size of 66.40 (minus a few hundreths) Wiseco kit #849M06640 Roughly 3.1 mm larger in diameter. One more thing... the exhaust valve "flapper" had to be trimmed a bit to keep it away from the larger piston. We also did this to several Honda CR250R bikes. Good Riding! Jim
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Jim Cook Smackover Racing Team LAGNAF '11 Gas Gas EC250 (primary ride) '06 Gas Gas DE300 2004 Gas Gas TXT300 Pro '94 Husaberg FE350 '86 Yamaha IT200 '86 Honda TRL200 Reflex '04 KTM 525EXC (soon to be dual sported) Several others, including project bikes, Deb's bike, and a fleet of grandkids' bikes Let's go riding! http://www.jebruns.com/Wudi19/wudi19.html http://www.ahrma.org/schedules-results/cross-country/ |
#22
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Fred Overstreet 2010 EC250 SixDays 2004 GasGas EC300 -Sold to a good home 2006 GasGas EC250-Sold to a good home 2006 GasGas TXT 280 Pro |
#23
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Fred1956,
I have Boomhauer's/Nambotin's GG 275 from the 2007 North American WEC rounds and, to me, it bridges the gap between the 250 and the 300 right down the center. It's made from a 300 bottom end and a 250 topend (so I'm told as I've only had it a short time). Everyone who rides the bike here in Colorado wants it as they love the power and delivery. I'm big (235lbs) and here's my impression: Early in the ride I wish I had a little more power down low but halfway through the day I'm glad there is no more power. Like all GGs it runs like it will never stall, the gearing spacing with the power is perfect, and there is less vibration than my 300. It does rev a touch quicker than the 300 but it seems to have the same rev ceiling. There you go, if you have any questions, let me know! Eric
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2018 GG 300 GP 2014 GG 300 Racing E 2002 ATK 605 Dual Sport 2003 KX/KDX 220 hybrid 2021 Kawasaki KRX 1000 Trail Edition 1974-86 Vintage Can Ams, SWMs, Puchs, etc. |
#24
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I have a 2011 cc300. I am finding a bit if a handful even with a flywheel weight fitted. Reading this topic about common components shared between the 250 and 300, is it possible/easy for me to convert my 300 to a 250? If it is possible what components would i require to change and would I have to re-jet?
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#25
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Steven Beane #275 PlusOnePerformance - Superior Service the World Over - Dearborn MI AMA District 14 (Michigan) Officer afterhourscycle.com Michigan's Beta and TM Race Headquarters |
#26
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Hey Eric,
you one of the guys we road with that bought Robby's bike? I had the loaner yz250. I should be sending my check to hall's for my GG next week Cheers, Rob Quote:
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#27
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Fred Overstreet 2010 EC250 SixDays 2004 GasGas EC300 -Sold to a good home 2006 GasGas EC250-Sold to a good home 2006 GasGas TXT 280 Pro |
#28
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I wouldn't care if the 300 had a 50 cylinder on it, I love it!
I have a 2011 EC 250 that is awesome. But had I known how smooth the 300 was compared to a KTM, that's what I would have gotten. dlf, I'll trade you my 250 for your 300. |
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