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
jfreadman

what is wrong

9 posts in this topic

Freshly assembled motor. Running the hot cam with auto decompresion.

THUMPER1.jpg

100% SURE THE TIMING IS CORRECT

100% SURE THE VALVES ARE IN SPEC

EMP 3 CLIP

165 main

200 main air

40 pilot

75 pilot air

zip ty fuel screw

damn thing is very hard to start. I had this dream that once I rebuilt the motor all would be great. Pulled the pilot and fuel screw out, and shot brake cleaner through the pilot hole. Brake cleaner came out of the fuel screw hole and inside the carb throat. So the pilot ciruit is clear. What do I look at next? I humble enough to admit I could have done something wrong.

Share this post


Link to post
Share on other sites

What elevation are you at? A 40 PJ seems pretty small. Try a 42-45 and it may help. Since doing the cam swap my bike is a bit harder to start and it seems that when I give it some gas it starts up no problem.

kind of like starting a 2 stroke. I am running a 42 but, I may need to go to a 45.

Share this post


Link to post
Share on other sites

42 pilot seems to help. I will go to the bike shop Monday and get a 45. Hopefully I can get the bike to idle so I can run the fuel screw in, and out and prove the pilort circuit is in the ball park.

Share this post


Link to post
Share on other sites

The starting drill for both my son's two-fiddy and my 444 with hot cams is: blip the throttle twice, kick the kicker thru slowly twice, one swift kick (with no throttle) and BBBRRRAAAAAAPPPPP.

Share this post


Link to post
Share on other sites
The starting drill for both my son's two-fiddy and my 444 with hot cams is: blip the throttle twice, kick the kicker thru slowly twice, one swift kick (with no throttle) and BBBRRRAAAAAAPPPPP.

What size PJ are you running Birdy? How many turns out on the fuel screw?

Share this post


Link to post
Share on other sites

Man what a difference having the pilot circuit adjusted correctly makes. I'm running a 45 pilot and the bike starts easy, runs strong. Now if I could just feel good about the loud clatter in the head, when the bike is running. I read in the newbie threads that the bike will make uneasy sounds, but this seams out of character. Long story short, three years ago the bike was parked because I let the chain stretch and grenaded the motor. I have it all back together now and I don't remember it being this clattery.

Share this post


Link to post
Share on other sites
What size PJ are you running Birdy? How many turns out on the fuel screw?

Max- As near as I can remember, I'm running a 42 pilot (it's been a long time since I diddled with the carb..but it's whatever JD recommends with his kit) and the fuel screw varies between 1-1/4 and 2 turns out depending on temperature.

Man what a difference having the pilot circuit adjusted correctly makes. I'm running a 45 pilot and the bike starts easy, runs strong. Now if I could just feel good about the loud clatter in the head, when the bike is running. I read in the newbie threads that the bike will make uneasy sounds, but this seams out of character. Long story short, three years ago the bike was parked because I let the chain stretch and grenaded the motor. I have it all back together now and I don't remember it being this clattery.

Are you sure the clatter is coming from the head? My 426 is pretty "clattery" too, but the noise is coming from the primary drive grears. Use a mechanic's stethescope or listen thru a long screwdriver...with a skid plate on, the noise sounds like it's coming from the head, but in reality it's bouncing off the skid plate.

If the noise is coming from the head, recheck your valve clearances, as they are probably too loose.

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