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MIKE_SCHIADA

hesitation,bog, on accel. off idle

11 posts in this topic

mike s. here,i have 02 xr650r,bike runs great,no miss per say,has had hop up kit done at dealer,has wb e series pipe on it.on initial accel off of idle with choke 1/2 off bike has flat spot,not good for wheelies as i am sure yo all know,if i run with choke at half or almost off bike runs great,what can i do to fix,will this damage bike if i run w/ choke 1/2 on?

seems to me w/ choke somewhat on it must be running lean to run correct w/ choke 1/2 on? :)

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You'll never get rid of it with the stock carb. Thats just the way a big four-stroke without a pumper carb runs. Many people are putting on Edelbrock Qwiksilver carbs with great results.

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Originally posted by MIKE SCHIADA:

added;correction,problem is w/ choke off,runs perfect w/ choke 1/2 off

If your bike runs much better with the choke half way on/off, then consider richening your mixture. What jets do you have installed right now?

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Sounds like you might have a clogged pilot jet circut as well. The same thing happened to mine- it would run on 1/2 choke, but it was still lean. Pull the carb and give it a good wask of carb cleaner through the circuts. Otherwise your mods have created a need to re-jet. Good luck- Chad

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Mike and Kevin, If a brp needs the choke half

on to run properly when warmed up ( I am

assuming you warm up before doing wheelies )

there is something wrong with the carb. other

than it not being a pumper.

On my U.K. brp, if I whack the trottle open

at any time whilst moving eg. 1 mph plus there

is no boggging. In higher gears there is only the slightest

hesitation then ka-pow. If I whack it while

stationary and idling it dies, which I'm led

to believe is the norm for big 4 dtrokes.

There has been speculation that there is a

slight difference between U.K. carbs and

'merican ones, but even allowing for this

it still seems to me that you should be

able to dial-out most of your hesitancy.

Just my opinion. cheers, Craig

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thanks for all the feedback guys,still have ?

does it hurt bike to run with choke not all the way off as bike runs perfect like this.

thanks to all,mike s. :)

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Well that is a good question. I going to say YES because I had the same problem on my XR600. I had to choke the bike 1/2 way everytime I started it hot or cold. I even ran with the choke on 1/2 way a lot of the time. UNTIL I sucked part of the choke plate in my engine and took out the top end 65 mile out in the desert. Bummer Dude :)

This my not be the same on the 650's but it cost Honda $2000 to replace everything.

I would check the primary jet. A 68 is good. You can also try raising the needle one notch.

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Originally posted by Moredesert:

I even ran with the choke on 1/2 way a lot of the time. UNTIL I sucked part of the choke plate in my engine and took out the top

Yep,

The 650R has that same plate on the choke. I took mine off ASAP. I hate to say it, but changing to the Edelbrock is the only way to fix the carb woes of the 650R.

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