Jetting questions

Hi all, I just picked up a 1998 XR650L with 10k miles on it, I'm getting ready to pull the carb out to check for mods (if any). I plan to do the Dave's mods to it. what I can see from the outside is I have a full Youshumri exhaust system (header and pipe), UNI air filter. My questions are: what jets to use, (I'm in Atlanta Ga.) and also what to look at to check for "uncorked" airbox, if it's still corked I will uncork it if someone would tell me how :busted:

I plan to ride the bike 90% street.

So with my after market exhaust, uncorked air box and uni filter, would I stay with Dave's reccomendations of 55/158, .030 needle shim, mixture screw out 2.5 turns, and slide drilled out to 5/32?

Ya'll are better than a factory maintenance manual :worthy:

Best wishes and Thanks in advance for your knowledge.

Steve.

Hi all, I just picked up a 1998 XR650L with 10k miles on it, I'm getting ready to pull the carb out to check for mods (if any). I plan to do the Dave's mods to it. what I can see from the outside is I have a full Youshumri exhaust system (header and pipe), UNI air filter. My questions are: what jets to use, (I'm in Atlanta Ga.) and also what to look at to check for "uncorked" airbox, if it's still corked I will uncork it if someone would tell me how :worthy:

I plan to ride the bike 90% street.

So with my after market exhaust, uncorked air box and uni filter, would I stay with Dave's reccomendations of 55/158, .030 needle shim, mixture screw out 2.5 turns, and slide drilled out to 5/32?

Ya'll are better than a factory maintenance manual :ride:

Best wishes and Thanks in advance for your knowledge.

158/55 is a good start. Whats your ele.? If the airbox is NOT uncorked, there will be a "snorkel" riveted to the air intake on top. All you need is what "dave's mods" recomends.:busted:

I believe it's about 1000 ft.

Oh and another note: it still has the smog pump installed, I ordered the block off plates this morning to remove that contraption.

Thanks, Steve.

Just do what you already have planned, including smog removal. That jetting will be fine at that ele.

Where is a good place to buy the jets needed to do Dave's Mod???

Thanks in advance.......

Local dealers usually have them.

there about $4/5 each, sounds like you got what you need just have to Get-r-done. jetting should be darn good for ya.

Thank's for the great advice, I hope to have Dave's mods finished soon.

Steve.

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