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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
03CRF450 Hotcam+HeadMod by Eric & Rich - Jetting question...
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[QUOTE="Yoken, post: 800438, member: 25312"] Hi Eric, Rich, I finally got all the parts, rebuilt the engine and went for a test-ride last Sunday...Mmmm... not bad at all! The engine is a lot smoother down low and pulls strong in the mid range. It feels like going 1 or 2 teeth up on the rear sproket, while still pulling the stock 13/50. I really like the mod that you guys recommended. Thanks! For those how how don't know, here is what has been done to the topend: - Head porting - new Hotcam - Kibblewhite valve kit - new piston Wiseco 13:1 I've a couple of questions though, that I'll share in this forum: 1- The bike seems to vibrate a bit more than before, especially at idle (I didn't feel it when riding). Am pretty sure I re-aligned the counter balancer properly, but I'll check again. Could it be from the new Wiseco 13:1 piston? Weight versus stock piston? 2- It is pretty hot and humid here in Nashville these days so I leaned out the jetting a bit: - stock #42 pilot - stock needle OBELR but with clip up 1 groove (in 4th) - main jet dropped to #165 - pump squirt time reduced to minimum I was at Crofton-KY for the test-ride, nice 80F with low humidity. Track was dry, hard-pack. Rode about an hour at low to mid range to break-in the new engine. Didn't rev the engine yet. The spark plug insulator is dark brown, almost black, all around! Is that still too rich at the needle? (I'll check the WOT conditions later when I am in better shape...he he!) What are your jetting guidelines with the above mods? 3- Compression test gives only 55 PSI using the kick-starter and with warm engine. Is it normal? The specs for the stock engine are 64 PSI @600 RPM... Thanks again for your help, Yoken. [/QUOTE]
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03CRF450 Hotcam+HeadMod by Eric & Rich - Jetting question...
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