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 Need to get on the dyno

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Hak
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Age : 41
Location : Alabaster

PostSubject: Need to get on the dyno   Tue Aug 11, 2009 10:57 pm

Do I need to buy a street tire to tune my bike on the dyno? I am planning on installing my jet kit this weekend and I'd like to take it to someone who can do bike dynos so that I can see my power and AFRs. Who does this locally?
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easy2pass

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Location : Pell City

PostSubject: Re: Need to get on the dyno   Wed Aug 12, 2009 6:44 am

pretty sure blake in trussville has a bike dyno.

from what ive seen though, that jd kit gets it pretty dang close if you use their settings for the needle clip/pilot/main.

the only thing i had to change was the main, and i just did some wot 3rd gear pulls down the street, then pulled the clutch/kill button ........then checked the plug.

did you fix your accel pump issues?
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PostSubject: Re: Need to get on the dyno   Wed Aug 12, 2009 7:42 am

Yeah there is a great database thread on thumpertalk about the YZ/WR250 setups people run and their elevation and temps. Seems most of them for our area are running pretty close to what JD recommends. If anything its maybe the main or the neddle clip position. I figure I'll run the red needle for the summer and as temps get below 80 degrees I'll swap in the blue needle.

The kit came with two orings (thin and thick) that go on the AP timing linkage. I still haven't pulled off the carb to time how long my AP squirt is and if its a dribble or an actual steady strong squirt. I'm going to try pull the carb off to the side of the bike so I can check all of this.

Hoping the kit will at least address some of the issues and make the bike run better.
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PostSubject: Re: Need to get on the dyno   Fri Aug 14, 2009 3:24 pm

Woohoo! JD kit installed. I went with the red needle and #185 main. Cleaned the carb and pilot jet real good while I was in there. Installed my Merge Racing adj. fuel screw too.

NO MORE HANGING IDLE!!! Cool Cool Cool

Like a bonehead I forgot to put in the oring that came with the kit that goes on the AP timing screw so I still have to double hit the throttle a little but not nearly as bad now. No more off idle bog either!! Bike feels completely different and now I can enjoy it because I don't have to deal with that dreaded idle issue anymore. I actually have engine braking now haha!!
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PostSubject: Re: Need to get on the dyno   Fri Aug 14, 2009 5:23 pm

if you take the carb back off, try a smaller leak jet.......that will tune out your accel pump probs if the oring doesnt work.

btw 185 main jet sounds huge...but i guess thats a yamaha Shocked
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PostSubject: Re: Need to get on the dyno   Fri Aug 14, 2009 6:36 pm

I have replaced the leak jet already. I went with the #40 Wink

Yeah the recommendations from JD and from guys in Alabama or surrounding states suggest the 185. Some run the 180 but most are using the 185.

Here are my settings copied and pasted from TT:

Model: 2005 WR250F
Timing: plan to unclip the gray wire for YZ map soon. stock WR for now
Main jet: #185
Pilot Jet: stock (not sure of number)
Leak Jet: Yamaha #40
Fuel screw (turns out): Merge Racing FMS (2 turns out)
Needle model/Clip position: JD red needle 5th from top
Airbox lid (on or off): ON (not modded)
Pipe: stock with PMB performance insert (sparky still in)
Altitude where you ride: sea level to 600ft
Location: central Alabama
Temperature where you ride: summer/fall 80's-90's and humid as hell
Other mods: No-Toil air filter
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