yz426 hotstart /cam questions


5 replies to this topic
  • hontrx265r

Posted September 27, 2004 - 02:42 AM

#1

I have a couple of questions for you guys. First off I have a yz426 in a quad frame it is using the first generation fcr carb the head is from a 400, on the intake there is an air tube that is unused in the quad. If I hook a hot start button to this would it do the same thing by letting in fresh air? Also I just bought a set of cams with adj. intake and I was wondering how to degree the intake cam,What power band changes does advancing/retarding the came make?

  • Hick

Posted September 27, 2004 - 11:01 AM

#2

Yes, that should be your hot start hose. Either plug it permanently or install a hot-start valve.

In the (very) early days of this site there were a few guys changing the cam timing on their 400s. If I remember correctly they advanced the intake timing by about 5 degrees for more low end punch. They also advanced the exhaust timing...

Stock YZ 400 timing lobe centers should be:

113 ATDC Exhaust
101 BTDC Intake


Hope this helps.

  • hontrx265r

Posted September 27, 2004 - 01:11 PM

#3

Another question With any one that has installed the hot cams. There are two punch marks on the auto decomp cam one on top and one on the left side. When one is lined up the other isn't so there is either 12 pins between cam gear centers or 13 which way do I put it for yz timing I'm assuming it is like this because it is listed for both the wr and yz.

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

Posted September 27, 2004 - 02:54 PM

#4

there will be 14 pins between punch marks. :cry:

  • hontrx265r

Posted September 28, 2004 - 03:45 AM

#5

Are you positive on that 14 seems like an awful lot?

  • Fastest1

Posted September 28, 2004 - 05:41 AM

#6

Pm "Hotcams" he is a member here. It is more about position of lobes than pin count. He even has in his signature "do not count pins" :cry:





Related Content

Forums
Photo

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride


Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.