hesitation,bog, on accel. off idle

10 replies to this topic

Posted June 17, 2002 - 04:31 PM


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? :)


Posted June 17, 2002 - 04:53 PM


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

  • RedThunder

Posted June 17, 2002 - 05:05 PM


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.

  • qadsan

Posted June 17, 2002 - 06:07 PM


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?

  • pbgunrunner

Posted June 17, 2002 - 06:33 PM


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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  • Craig_Mitchell

Posted June 17, 2002 - 07:34 PM


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


Posted June 18, 2002 - 04:38 PM


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. :)

  • Moredesert

Posted June 18, 2002 - 05:44 PM


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.

  • gtms34

Posted June 19, 2002 - 06:09 AM


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


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.

  • Moredesert

Posted June 19, 2002 - 08:43 AM


How much is an Edelbrock carb anyway?

  • qadsan

Posted June 19, 2002 - 09:08 PM


Originally posted by Moredesert:
How much is an Edelbrock carb anyway?

About $400 - $480 depending on where you buy from.

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