Thread: Do i need to re-jet my carbs??
12-10-2007, 09:32 AM #1
Do i need to re-jet my carbs??
I have a 1200pv that i have just rescently rebuilt, and i am unsure what to do carbwise as i am a newbie. I had the cylinders re nikilsiled, and im using wsm platinum top end... I have riva hig compression heads, d-plate, and free flow. Also using anew case, and crank. I already have the engine assembled, but before i go any further i want to address the stock carbs. I was told that with opening up the exhuast as much as i have that i need to re-jet or tune the carbs accordingly to compensate for the increased airflow or the engine will run too lean and my top end wont last long at all... Is this true??? If so what do i need to do to my carbs to make this engine run correctly, and to keep it from running lean? Thats the only big question i have. Oh and whats the trick to getting these engines in. I noticed that last time i tried to install it the exhaust was hell to wrestle with trying to get in. Do i put the exhaust(lower pipe) first, or do i wait until the engine is in?? And lastly if you have any other suggestions on building a new engine, or something i might run in to you advice would be greatly appreciated!!!
p.s. Whats the best impeller to run with my mods? Looking for top speed, but still want some low end take off...
2000 Yamaha xl limited 1200pv
Last edited by kurt1200; 12-10-2007 at 09:46 AM.
12-10-2007, 09:51 AM #2
12-10-2007, 10:01 AM #3
No im going to be using the stock intake... Im trying to resist spending any more money! I have already spend in excess of $3,500!!
12-10-2007, 10:24 AM #4
- For your set-up carbs should be 110 pilot jets 120 main jets 1.5 needle and seat and 95 gram spring. disable the accelerator circuit. if you remove the choke plates take the main jet to 125
- Do a search for pressure testing your motor there are several threads here on this. Pay attention to the case halves and the crank seals
12-10-2007, 10:31 AM #5
Ok thanks! Do i need to buy different jets or what? Im sorry,but i know nothing about re-jetting... Is there a kit i can buy to do this? How hard is it??
12-10-2007, 10:34 AM #6
Ok nevermind that... i found jets over on riva racings website for like 3 bucks a piece... Are all mikuni jets universal though??
12-10-2007, 10:42 AM #7
12-10-2007, 10:45 AM #8
12-10-2007, 01:27 PM #9
- Join Date
- Jan 2006
- Texas City, Texas
About your impeller, a 13/19 would work well with your set up. I cannot stress this enough, with the extra speed that you will have, get an aftermarket intake grate.... a double bar type for either a GPR1200 (for better hook up) or a GPR 800 grate (for better top end). The grate is a safety item and is an ABSOLUTE must for a modified GPR.
The after market flame arrestors really work well with your set up.
If money is a concern, then post on the Greenhulk want adds for the items. There is a lot of good to excellent parts for sale there. You will save some $$$$.
12-10-2007, 05:52 PM #10
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