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Title: 450R Breaking-up Top-End... Post by: Yamaha72 on June 20, 2006, 08:17:29 PM My friend took his 450R out today and when he really got on it on the top end it would pop and sputter, hense break-up. Could this be caused by a clogged or dirty main jet or a fouling sparkplug?
Title: Re: 450R Breaking-up Top-End... Post by: 4fittyr on June 20, 2006, 08:29:11 PM could be that or not jeted right or he's hittin the rev limiter and needs to but atfermarket one gives u 11,000 rpm instead of 10,000
Title: Re: 450R Breaking-up Top-End... Post by: Yamaha72 on June 20, 2006, 09:22:41 PM Its not jetting as it has ran strong, and its definently not the rev-limiter :X
Title: Re: 450R Breaking-up Top-End... Post by: ebtrx450r on June 20, 2006, 09:25:47 PM If it's an 06 you don't need to buy aftermarket. you just unhook one wire and you get an extra 1000 rpm's out of it.
Title: Re: 450R Breaking-up Top-End... Post by: TOY_DOCTOR on June 21, 2006, 03:59:07 AM take the choke off
Title: Re: 450R Breaking-up Top-End... Post by: Yamaha72 on June 21, 2006, 11:31:51 AM take the choke off If it's an 06 you don't need to buy aftermarket. you just unhook one wire and you get an extra 1000 rpm's out of it. Its a 2005, and TOY_DOCTOR, the choke wasn't on.... Title: Re: 450R Breaking-up Top-End... Post by: UncleRico on June 21, 2006, 12:20:32 PM "Could be the Fitzer Valve!
In that case, you'll need some 30 weight motor oil and some ball bearings. It's all ball bearings now adays" Ummm...are you saying that it's dropping out in 5th gear only? Or is it sputtering at the top end of the power band in the lower gears as well? Title: Re: 450R Breaking-up Top-End... Post by: Fox17 on June 21, 2006, 12:47:49 PM we had a 250x that did that cause the carb bowl was gunked up. we cleaned it out and it runs perfect now. it would sputter and stall when we got on it hard.
Title: Re: 450R Breaking-up Top-End... Post by: svtbolt04 on June 22, 2006, 08:34:32 AM Question is, do you run with the air box lid off, and do you run a K&N that hasnt been cleaned in a while.
Take the bowl off the carb and pull the main jet and blow it out. Then pull the remaining out one at a time and blow them out and replace them. I am willing to bet anything if it has the airbox lid off, the jets have very fine amount of sand in there. Doing what I said will fix it up. Dont use a air hose because its too much power and you might shoot it out of your hands. |