Jetting questions


8 replies to this topic
  • F2504X4PS

Posted February 07, 2008 - 06:04 AM

#1

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.

  • martinfan30

Posted February 07, 2008 - 07:43 AM

#2

[quote name='F2504X4PS']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:

  • F2504X4PS

Posted February 07, 2008 - 07:56 AM

#3

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.

  • martinfan30

Posted February 07, 2008 - 09:52 AM

#4

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

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  • mrfreeze54

Posted February 10, 2008 - 06:49 PM

#5

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

Thanks in advance.......

  • martinfan30

Posted February 11, 2008 - 09:00 AM

#6

Local dealers usually have them.

  • Denn10

Posted February 12, 2008 - 09:58 AM

#7

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.

  • F2504X4PS

Posted February 13, 2008 - 03:58 AM

#8

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

Steve.

  • Denn10

Posted February 13, 2008 - 08:27 AM

#9

http://www.4strokes....xr650lcarbmods/

link if ya need it with pics.





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