Sign in to follow this  
Followers 0
Sigtober

Pulling Decompression Lever while engine running

11 posts in this topic

The other day I had my bike running and wanted to see what would happen if I pulled the Decompression Lever. The engine shut off. Is this bad for the bike? :thumbsup:

Share this post


Link to post
Share on other sites

I wouldn't recomend using the decomp lever as a kill switch, but you should be ok. There is a chance that if your piston to valve clearance is not right you could contact the piston with the valve doing this. In other words, don't get in the habbit of doing that. Accidentally now and then is not something to loose sleep over. Hope this helps.

Josh

Share this post


Link to post
Share on other sites

At any speed much over an idle there is a risk of breaking the exhaust valve lifter as a result of the rocking load applied to it by stopping against the decomp shaft. It's OK to use it for bump starting, but at higher speeds, including idling, it gets risky, and should not be done.

Share this post


Link to post
Share on other sites

hey, i noticed that you have a nice modification set up for your carb. i have a 01 yz426 and was wondering if you know if i did the exact same mods that i would do the same amount of turn on the fuel screw as you did, since yours is a wr and mine is a yz, is it the same? thanks

Share this post


Link to post
Share on other sites

They will be similar most likely, but the fuel screw setting is a never ending adjustment. Think of it as a fine tuning, you adjust it almost every ride for optimum throttle response. It also provides a guideline for the pilot jet. Less than 1 turn out and you need a smaller pilot, more than 2.5 turns out and it is time for a larger pilot. I do recommend the JD kit, it gives you much more range of adjustment and also improves performance. Hope this helps.

Josh

Share this post


Link to post
Share on other sites

thanks, how much did u pay for your jd jet kit, do you know how to get it cheap, im kinda short on 70 dollars

Share this post


Link to post
Share on other sites

Bought mine on from the TT store. I suppose you could watch E-Bay, but I would just wait until you have the money and get it from TT. They have a low price guarantee, and the customer service is great.

Josh

Share this post


Link to post
Share on other sites

I had a branch grab my de-comp lever and kill it. I was terrified that a valve and piston had collided. They didn't, fired right back up and I was on my way. Few hundered feet down the same trail a branch snagged my front brake lever and I ate it pretty bad...lol.

Share this post


Link to post
Share on other sites
One word: Bark Busters. Oops. That was two. :thumbsup:

They are on "the list". :thumbsup:

I run shorty bars already, great for tight work but man-o-man do they ever work on the shoulders. I rode a friends KTM with pro-tapers and it was like a Cadillac in comparison, but I utilize the shorter bar length alot and can't decide if I wanna go full length.

Share this post


Link to post
Share on other sites

The exhaust valves will not hit the piston as a result of pulling the compression release at any speed unless the lifter becomes damaged. It doesn't hit when you crank it, does it?

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  
Followers 0