HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
desmo900

No choke, no run

12 posts in this topic

Hello, I have now finished uncorking my bike, jetting, carb. boot, airbox, and drilled out the pipe. Unfortunatly it still will not run unless the choke is ON at least half way. Jetting is: 170 main, 68s pilot, 53 needle at 3rd position. Im at near sea level and I have adjusted the pilot screw to the highest rpm. and then readjusted the idle to 1400rpm

It runs great, but something must still be wrong.

Any help would be apprceiated.

Share this post


Link to post
Share on other sites

I dunno,but it sounds like it wants more fuel,but technicaly it don't need it. Mine is jetted one down from 170 fmf Q and has no prob. Try turning up idle some more and let it warm up,then no choke and adjust idle.

Idle mixture screw should be 1 1/1 to 21/4 turns in that range,mine is about 1 3/4 turns out.

Is carb. clean inside?? Good fuel flow?? :thumbsup:

Share this post


Link to post
Share on other sites

sounds like you have a bad air leak. I use an old fork oil bottle filled with pertrol and carefully spray fuel around the intake manifold joins. If there is a leak, it will suck the fuel into the engine causing it to run rough, then you will know where the leak is. Not sure about your procedure for setting the idle mixture either. generally speaking higher rpm=leaner mixture.

Share this post


Link to post
Share on other sites

Thank you for the suggestions. The carb. is very clean inside and it had this problem before I rejetted.

I'll try the idle mixture settings again.

And try the air leak check that was mentioned

I have searched this group and the jetting group and have not found any one with a simular problem, I guess im just special :thumbsup:

Share this post


Link to post
Share on other sites

Howdy ya'll. I still have the Choke problem. If I turn off the choke the motor dies instantly. I have re-cleaned the inside of the carb. checked the rubber boots for good fit, reset the idle and mixture all with no change. Its like the choke is connected to the kill switch.

My local honda dealer has no advice so you guys are my last hope. Any suggestions? :thumbsup:

Share this post


Link to post
Share on other sites

did u check for air leaks with petrol?

From what you've typed, it sounds like the problem started when you rejetted the carby. I'd check all the parts that removed from the carby. You didnt do something silly like leave an air jet out? or maybe get 2 jets in the wrong holes? Did you adjust the float level? If the float level was very very low you may get this problem. Have you tried riding the bike? I'd be intrested to know if it goes ok when you ride it with the choke out. Also I'd check the obvious like needle and seat and fuel supply

Share this post


Link to post
Share on other sites

He already stated he had this problem BEFORE he rejetted his carburator

The carb. is very clean inside and it had this problem before I rejetted.

Maybe the air leak is caused by something that went wrong internal to your carb and not obvious from the outside....

Share this post


Link to post
Share on other sites

I would like you to consider my name for the stupid newbie of the year award

I was flipping the choke lever the wrong way.

the only thing wrong with the bike is its owner.. Thanks for trying to help..

Share this post


Link to post
Share on other sites

I would like you to consider my name for the stupid newbie of the year award

Damn!!!!!!!!!!!!!!!!

Every year I try to win that award and it looks like I'll come in second again. :thumbsup:

I'm not worried though.......there is still time........................ :devil::awww::lol:

Share this post


Link to post
Share on other sites

:devil:

I was having trouble imagining what could have caused your reported fault. At least it goes now :thumbsup:

Share this post


Link to post
Share on other sites

This is funny, I hate to laugh at yah. :thumbsup: Ride on, at least now your BP has come down.

Share this post


Link to post
Share on other sites

:thumbsup::devil::awww::lol::D

That's funny! I was gonna ask if you had the lever down and not up but didn't want to insult you.

Don't worry, you're not the first, I've seen the same thing here before.

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