Needle jet adjustment

[xr_stamm]

When I was opening up my carb the other day, I noticed the one jet appeared to be adjustable on the height. The one that the needle goes into has a jam nut. If you take that out, how do you ensure you get it back in the right spot? I uncorked my bike and I noticed the new billet exhaust tip (ebay) that I put on in the uncorking was rather black after a short ride < 1 mile.

[pigryder]

FIRST OFF r OF l AND EXACTLY WHAT DID YOU DO IN UNCORKING?

[HawkGT]

That is the emucification tube. The main jet screws into it (on the bottom end) and the needle slides into it (on the top end). It is not an adjustment point. It should be bottomed out and then secured with the jam nut.

[xr_stamm]

Thanks. I've been on Mars for a week or so. I'll pull it back out and verify.

I was getting some strange behavior when I would roll off from WOT. It would seem to breifly pick up power as I rolled off. I would get a lurch from the bike momentarily. Ever hear of this?

[HawkGT]

Thanks. I've been on Mars for a week or so. I'll pull it back out and verify.

I was getting some strange behavior when I would roll off from WOT. It would seem to breifly pick up power as I rolled off. I would get a lurch from the bike momentarily. Ever hear of this?

Yes I have heard of that. See the second post in this thread: https://www.thumpertalk.com/forum/showthread.php?t=326881&parentpage=2&highlight=popping .

That's the only place I've heard of the "roll-off" meathod for main selection so I couldn't comment as to it's applicability to all carbs/settups. But, following that meathod you should try a smaller main and see if the condition improves. What main are you running and what is your elevation?

Report back because I'm curious about it.

[xr_stamm]

It got cold up here again, so riding has stopped. I'll try soon and get back to you guys. Thanks for the tip. That post seemed like good information.