quadrcr161
06-04-2004, 01:23 PM
i recieved my HRC kits before my 450r and i pick up the 450r when the 1st batch was released. i installed everything but the cam about 2 weeks later. i didnt install it beacuse i figured it would be difficult since i have always worked on my 2 strokes. a few weeks ago at the track i was talking to a guy that has 2 of them for his kids to race. he was telling me how easy the cam install was except for that damn decompression bolt.
well last week (friday night actually) i broke down and installed it. it actually was pretty simple but i could not get the thing to fire and keep running, it kept dieing and wouldnt start. saturday i carried it to a friends shop where it fired right up and ran for a few mins, i had to give it gas to start it though which was strange. well as i pulled it into the shop from the trailer it made a whinning noise and we shut it down. well we tore back into it and were amazed from what we saw. the piece on the cam that the sprocket bolts to was almost ready to fall off. it had slid over about 1/8 of an inch and the whinning sound was the bolts hitting the valve cover. :eek2: i went home and grabbed the stock cam to check the timing to make sure it hasnt spun on the cam shaft.
i get back to the shop and we finish pulling it apart. the shaft looks fine and there are no swirl marks that would show that the piece spun on the cam, it looks like it was not pressed on all the way from the factory. we compaired the position of the lobes to the stock one and everything lined up perfect. we took it over to the press and pressed it back on, if it felt loose i wasnt going to use it but it took some pressure to press it back on and it was tight. so we put it back togeather and fired it up, and started adjusting the carb. we finish putting the plactic and everything back on. he takes it around the side of the shop and goes around a few trees to see how it feels, he has a decked out yfz, but he didnt get on the gas. i carry it home and let it warm up and go for a quick ride, this thing has no power, then it shuts off and dosent want to start. it seems like the jetting could be off but it ran great before the cam install. anyone have a sugestion? i wish i took some pics but my digi cam was left at work that weekend.
well last week (friday night actually) i broke down and installed it. it actually was pretty simple but i could not get the thing to fire and keep running, it kept dieing and wouldnt start. saturday i carried it to a friends shop where it fired right up and ran for a few mins, i had to give it gas to start it though which was strange. well as i pulled it into the shop from the trailer it made a whinning noise and we shut it down. well we tore back into it and were amazed from what we saw. the piece on the cam that the sprocket bolts to was almost ready to fall off. it had slid over about 1/8 of an inch and the whinning sound was the bolts hitting the valve cover. :eek2: i went home and grabbed the stock cam to check the timing to make sure it hasnt spun on the cam shaft.
i get back to the shop and we finish pulling it apart. the shaft looks fine and there are no swirl marks that would show that the piece spun on the cam, it looks like it was not pressed on all the way from the factory. we compaired the position of the lobes to the stock one and everything lined up perfect. we took it over to the press and pressed it back on, if it felt loose i wasnt going to use it but it took some pressure to press it back on and it was tight. so we put it back togeather and fired it up, and started adjusting the carb. we finish putting the plactic and everything back on. he takes it around the side of the shop and goes around a few trees to see how it feels, he has a decked out yfz, but he didnt get on the gas. i carry it home and let it warm up and go for a quick ride, this thing has no power, then it shuts off and dosent want to start. it seems like the jetting could be off but it ran great before the cam install. anyone have a sugestion? i wish i took some pics but my digi cam was left at work that weekend.