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84rm250

Replacing Exhaust Cam in 02 426

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What are your guys suggestions on a new cam for my bike? Should i get a stock one from a 450 with auto decomp or Hot cams? What year/size of bikes cams will interchange with my 426?

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Buy the HotCams unit. They are marked correctly for the 400/426, and fit the chain properly. They are also slightly less expensive than the OEM cams now, which wasn't true in the past. The aftermarket unit will be simpler to time, and cost a bit less.

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With the hot cam do i need to get both cams? Or can i run just the exhaust cam? Also do i need to buy the installation kit with all the shim pads and degree wheel?

Thanks for the help!

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i put just the hot cam exhaust only in mine, ran great, best thing I ever did to that bike.

I would not buy the shim kit , you will need exhaust shims, but that is it, so you would end up with alot of extra shims you will probably never use... unless your intakes are off now. good time to check them too.

just my .02

jay

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Jay's right about the shim kit. Trial fit the cam to check clearances and get what ever shim(s) you need.

You also don't really need the degree wheel. The Stage I exhaust can be installed by itself, and more or less duplicates the YZ450 grind.

I second the cam chain, too.

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Jay's right about the shim kit. Trial fit the cam to check clearances and get what ever shim(s) you need.

You also don't really need the degree wheel. The Stage I exhaust can be installed by itself, and more or less duplicates the YZ450 grind.

I second the cam chain, too.

99.9% of my yamaha 4stk knowledge has come from you...:smirk:

the .1% is what I know, which also usually wrong...:ride:

jay

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Head was just rebuilt with new valves, springs, valve guides, lifter buckets, shims, along with the chain, piston and rod after the motor exploded.

Only thing thats not new is the cams, and I'm having problems with it not starting and blowing flames from the pipe.

So I figured I'd try a new exh cam, thinking my old one might have slipped in the sprocket..

I look'd on ebay and only found them for around $170. This seems kinda steep for the one cam..?

Thanks for the replys

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When you replace with an auto-decomp cam you will also need to plug the hole in the head where the decompression mechanism enters. TT used to sell a pretty slick billet aluminum piece but I don't believe they do anymore. An automotive freeze plug will work though, but I can't recall the size so just measure the hole.

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The original supplier of the ones sold here on TT still has a few of the bolt-in billet plugs, too. PM or e-mail TT member Vibeguy.

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The TT billet plugs are great. I installed one when I did the 450DCM in 2003. Nice clean look with it installed.

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I have a 01 yz426 and I would like to install a cam with a auto-decomp what would be the best way or part to do this

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