Jump to content
Sign in to follow this  

what is the red pull knob behind my carb

Recommended Posts

There is a red pull knob similar to my choke knob right behind the Carb on my wr400.. what exactly is it or what does it do? Please help?

Share this post


Link to post
Share on other sites

That is the hot start knob. It's kind of the opposite of the choke. If you stall the bike when the engine hot, sometimes they are difficult to restart. When you pull the knob it allows air to bypass the carb and lean the mixture.

  • Like 1

Share this post


Link to post
Share on other sites

That damn bike is hard to start cold or hot. Do they make an auto decompression for the 400? Btw thanks:)

Share this post


Link to post
Share on other sites

Wrong, you need a 03 450 exhaust cam for auto decompression.

If its hard to start check your valve clearances.

IN 0.10-0.15

EX 0.20-0.25

Share this post


Link to post
Share on other sites
Wrong, you need a 03 450 exhaust cam for auto decompression.

If its hard to start check your valve clearances.

IN 0.10-0.15

EX 0.20-0.25

Hot Cams makes a replacement cam for the 400/426 that has an automatic compression release.

Share this post


Link to post
Share on other sites
On 2012. 01. 01. at 11:08 PM, 2grimjim said:

That is the hot start knob. It's kind of the opposite of the choke. If you stall the bike when the engine hot, sometimes they are difficult to restart. When you pull the knob it allows air to bypass the carb and lean the mixture.

thx man!!!!!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×