YZ450f motor in a YZ426f???


18 replies to this topic
  • YZFdude2020

Posted August 27, 2008 - 11:12 AM

#1

will it fit...?

  • dmoney1074

Posted August 27, 2008 - 11:24 AM

#2

Are you asking if it is a direct bolt in???

I highly doubt it, but why would you want to do it anyways?... the 426 motor is just as potent if not more potent than the 450 motor IMHO. If you put the 450 ex. cam in there, it will be just as easy to start as the 450 too :thumbsup:

Ive ridden almost all varieties of modern thumpers... and to this date one of my favorite engines is the 426 (I LOVE the KTM 450 motor)... I say keep it!

  • GENE426

Posted August 27, 2008 - 11:28 AM

#3

I thinbk it will but he is right about the 426 motor

  • YZFdude2020

Posted August 27, 2008 - 11:30 AM

#4

yeah? i like the 426, it just pukes out power, its rediculous. can i put hotcams stage 2 cams for an 03-05 yz450 in there? i know everyone say just the exhaust cam, but if you get the cams that are supposed to work together will it make a big difference in power? (not that it needs more power!) but yeah i cant even start it...like at all, its hard...so get the cam,life is better?

  • grayracer513

Posted August 27, 2008 - 12:08 PM

#5

The only reason to use a 450 cam in the 426 is to use the OEM Yamaha cam for the auto decomp feature less expensively than you could with an after market cam. It does provide a bit of a performance boost, too, but mostly, it just widens the existing power curve. If you are buying aftermarket cams in pairs to get a performance gain, then buy the ones made for the 426 with auto decompression included. Installation is simpler.

  • YZFdude2020

Posted August 27, 2008 - 01:15 PM

#6

ok so just buy the 450f auto-decomp cam?

  • dmoney1074

Posted August 27, 2008 - 01:19 PM

#7

yeah? i like the 426, it just pukes out power, its rediculous. can i put hotcams stage 2 cams for an 03-05 yz450 in there? i know everyone say just the exhaust cam, but if you get the cams that are supposed to work together will it make a big difference in power? (not that it needs more power!) but yeah i cant even start it...like at all, its hard...so get the cam,life is better?


Just get the yz450f cam... you dont need the hotcams. They just move the power around a little. Not worth the money IMHO. The yz cam is like $103 from the TT OEM store... very cheap! :thumbsup:

My other suggestions for the 426 is to get a JD jet kit. Follow all the instructions, and your bike should start on the first kick every time. IMO Yamaha did a poor job jetting these bikes, so this is a necessary mod in my book. From there you can just adjust the fuel screw for changes in temp throughout the year (most of the time).

I loved my 426.. I had to learn how to dial it in, but once I got familiar with it, I never had a single bad issue. I'm now regretting I sold it :worthy:

  • YZFdude2020

Posted August 27, 2008 - 02:29 PM

#8

so you guys approve? badass bike? the one i got has about 20 hrs on the whole damn thing...

  • YZFdude2020

Posted August 27, 2008 - 02:29 PM

#9

But I Cant Start The Damn Thing!!!

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  • grayracer513

Posted August 27, 2008 - 03:22 PM

#10

The 450 cam requires special timing procedures. See Common Threads for the details.

Meantime, look at these:

http://www.yamaha-mo...troke_vid_a.mpg

http://www.yamaha-mo...troke_vid_b.mpg

  • YZFdude2020

Posted August 27, 2008 - 03:52 PM

#11

what do you mean?

  • grayracer513

Posted August 27, 2008 - 04:02 PM

#12

What does who mean about what?

  • YZFdude2020

Posted August 27, 2008 - 05:19 PM

#13

what do You mean with the different timing stuff?

  • dmoney1074

Posted August 27, 2008 - 05:49 PM

#14

what do You mean with the different timing stuff?


Hes talking about the way you install the cam (ie. the placement of the dots on each cam with respect to one another)

Hers the instructions on the install...

http://www.thumperta...078#post3706078

Your welcome

  • grayracer513

Posted August 27, 2008 - 07:00 PM

#15

what do You mean with the different timing stuff?

When I said that, I also said, ...

See Common Threads for the details

The 450 head is different, and the marks won't line up in a 426 when they're timed right.

  • YZFdude2020

Posted August 27, 2008 - 09:00 PM

#16

OOOOOO, ok sorry

  • Codyeman

Posted November 28, 2015 - 06:58 AM

#17

Guys I need help my 2000 yz426f can't kick start at all froze up what should I do or and thing will help

  • Codyeman

Posted November 28, 2015 - 07:01 AM

#18

Some how I can't kick start at all froze up just start to froze up yesterday HELP 2000(YZ426F

  • grayracer513

Posted November 28, 2015 - 08:21 AM

#19

This is a 7 year old thread about a different subject entirely.  Start a new topic if you have a question.







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