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Joined
10/1/2016
Location
Fontana, CA
US
So i have a 2007 CR250R and would like to install an air striker on my bike. With all the horror stories ive heard about the oem carb, i actually have my bike running really crisp and have no jetting issues with the stock carb. The only reason i want to try installing the air striker is because i have heard great reviews how much better it makes the CR's, and i also got the carb for free so it's worth a shot testing out. The air striker i am installing is the short body tps carb off a 13 yz250. I live in southern California and mainly ride Milestone. Ive done lots of research already on this carb, but there is a lot of different opinions on settings. Im hoping someone on here can help me out because i know there is a lot of Vital users with this same set up or with the knowledge.
My question to you guys is:
-What is the best jetting settings for my area?
-Will the carb even make a difference if i already have my bike running really crisp?
-Does anyone have any info on how to make the TPS connect? or know who or where to buy an adapter harness from? (I prefer not to splice and cut wires if i dont have to)
My question to you guys is:
-What is the best jetting settings for my area?
-Will the carb even make a difference if i already have my bike running really crisp?
-Does anyone have any info on how to make the TPS connect? or know who or where to buy an adapter harness from? (I prefer not to splice and cut wires if i dont have to)
I liked the TMX on my '05 CR250. Read more here: https://thumpertalk.com/forums/topic/1191880-carburetor-heresy-i-like-m…
That being said, I'm playing with a PWK on my '17 Husky TC250 and think I might like the PWK better for this bike.
If you go to Chaparral they should have a box of jets for you to pick from. If you try to order Yamaha parts they will be more expensive.
Have you run your bike in the summer? I think in cool weather it would be OK.
I didn't bother with the TPS but there was a guy on Thumpertalk selling harnesses or you could make one if you are handy enough. The parts should be available at an auto electric place.
The Shop
Jetting specs were for sea level with relatively no humidity, moderate temps 70-80 deg. @ 0-1K elevation. 32:1 premix.
Mine pulled pretty hard with that set up and a PC pipe and silencer.
If you do decide to use the PWK carb, there are a bunch of different jetting combos that will work. The 02-07 engine is very tolerant, weather and jetting wise, when using the PWK. It's not nearly as tolerant when using the Mikuni.
The N3EW that comes in the 13' YZ250 carb that you have, will work decent in your bike, especially with a #8 slide. For someone who just wants to jet it and forget it, I would recommend a Suzuki NECW needle in the #3 clip position. along with a 42 pilot jet, and a 172 main jet and set the airscrew a 1.5 turns out. IMO,There is very little to be gained by hooking up the TPS. Some people may not even notice a difference with it hooked up and not.
FWW, one of my least favorite needles to use, was the 689/ 715 Honda oem needle from an 00' cr250. It just wasn't very good when compared back to back with many other needles.
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