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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
What style of porting and use race gas?
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[QUOTE="robwbright, post: 1138490, member: 60515"] Eric told me the difference between head work/race gas and no head work/pump gas is about 1 HP. Your total gain will probably be in the 6-8 HP range. I figured that since I was spending almost $500 on the motor - and I only use 2-4 gallons a week, why not get the head work. I have run AVGAS 100LL (briefly because I didn't have race gas on hand), 105 and 110 in the 144 with no detonation issues that I've noticed. I wouldn't recommend the AVGAS, but 105-110 should be fine. The octane isn't so much the issue - you will want to look into distillation curves and all sorts of other stuff. Low-mid porting is generally not recommended for 125s - you're not going to get much actual "low end" no matter what you do - there's just not enough displacement even at 144cc. Mid-top is for experts. I'm not an expert, so I went with mo betta everywhere. The best way I can describe it is pretty much the same power spread as stock, but 20% more everywhere. The link to my review of the 144 after I got the jetting pretty close: [url]http://www.dirtrider.net/forums3/showthread.php?t=126800[/url] First race report: [url]http://www.dirtrider.net/forums3/showthread.php?t=133418[/url] Here's a thread on fuel you might find useful. [url]http://dirtrider.net/forums3/showthread.php?t=125942[/url] And there are a couple articles from Fuel genius Rich Rohrich. I don't have the links anymore, so I'm pasting in the next response. . . See attached pic showing distillation curve of race gas vs. pump gas - it's obvious why the race gas makes more power. . . And dyno chart of a CR133 vs stock CR125. The 133/134 and the 144 make similar peak HP, but the 144s have a bit more bottom. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
What style of porting and use race gas?
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