Help - running rough after tensioner replacement

[langma]

I just finished 3 weekends of work on a 2006 venture, including copper exhaust donuts, rear heat exchanger installation, carb clean, front bushings, and cam tensioner. Went to start, and after much cranking it back fired a few times before starting. It seemed to run Ok with the choke on, but at warm idle with choke off it sounds bad - almost like it's only firing on 2 cylinders. I tried 2 sets of plugs, one set new, with no change. I followed the tensioner replace thread exactly, and I must have rolled the engine over 10 times after to make sure the timing marks lined up.

Could the backfire have caused the timing to jump? Has anyone had the timing line up after many rotations and then jump while starting? I think I will start with pulling the carbs and re-clean, but before I tear back into the engine I thought I'd get a sense check from others that have done this before.

 

[4strokeluvr111]

It sounds as if one of your pilot jets is plugged. I would go out and buy two new PJ's instead of trying to clean that tiny hole. They are cheap, especially after all the time and money you've put into it.

 

[grizztracks]

If it won't idle properly but runs OK at higher RPM's then it probably jumped time. It's not hat hard to pull the valve cover and stator plugs to recheck timing. I've done a lot of these and have had a couple jump a tooth on the intake cam which required resetting the timing. I'd check the timing first before chasing other possible causes.

 

[langma]

It does idle, but low and rough. Even at higher rpm it's rough. I think I'll start with carbs again, and if that does not work ill re check timing. The carbs were filthy,I wonder if by cleaning I dislodged some gunk that made it to the pilots after cleaning. I sure hope I don't have to tear it back down to re- set the timing...

 

[grizztracks]

Did you Sync the carb's?

 

[langma]

I have not - that's a great suggestion. My brother in-law used to be a motorsports mechanic - I bet he has the tools to do that. Even if it's not the problem - it will only help...

 

[grizztracks]

If you don't have a tool it's easy and cheap to make one: http://www.ty4stroke.com/viewtopic.php?t=108472&highlight=carb

 

[langma]

Awesome! Thanks for the info

 

[Vectornut]

Never question the GRIZZ.

 

[langma]

I finally got a chance to work on the sled, and found 2/3 pilots plugged solid again. Gave the carbs a clean, and it started right up and idles great at 1400 rpm. Thanks for the suggestions guys - if it wasn't for this forum I'd have the cam tensioner torn back out!

 

[4strokeluvr111]

I finally got a chance to work on the sled, and found 2/3 pilots plugged solid again. Gave the carbs a clean, and it started right up and idles great at 1400 rpm. Thanks for the suggestions guys - if it wasn't for this forum I'd have the cam tensioner torn back out!

Put inline clear fuel filters in both lines.