Replacing Exhaust Cam in 02 426


15 replies to this topic
  • 84rm250

Posted November 10, 2009 - 06:29 PM

#1

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?

  • grayracer513

Posted November 10, 2009 - 07:53 PM

#2

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.

  • 84rm250

Posted November 12, 2009 - 08:49 AM

#3

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!

  • jayh300

Posted November 12, 2009 - 09:04 AM

#4

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

  • jayh300

Posted November 12, 2009 - 09:10 AM

#5

oh to add, put a new cam chain in while you are there...

  • grayracer513

Posted November 12, 2009 - 09:17 AM

#6

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.

  • jayh300

Posted November 12, 2009 - 02:05 PM

#7

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

  • tmc55

Posted November 12, 2009 - 02:13 PM

#8

you can get the cam on ebay for $128.00 thats where i got mine.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 84rm250

Posted November 12, 2009 - 03:12 PM

#9

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

  • Wiz636

Posted November 13, 2009 - 12:15 PM

#10

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.

  • jayh300

Posted November 13, 2009 - 12:31 PM

#11

18 mm iirc... but i could not find one of those anywhere.... i bought one from this guy and it worked great. when i needed mine TT had just stopped selling them..
http://cgi.ebay.com/...=item56353fc9d2

  • grayracer513

Posted November 13, 2009 - 01:10 PM

#12

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.

  • Florida_426

Posted November 16, 2009 - 08:19 AM

#13

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

  • 84rm250

Posted November 17, 2009 - 06:27 PM

#14

thanks for the replys, i will need to get ahold of Vibeguy soon.

  • yz426f2001

Posted November 17, 2009 - 08:49 PM

#15

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

  • buzzgrizz

Posted November 17, 2009 - 11:30 PM

#16

http://www.thumperta...6291&highlight=
Heres all you need





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