New England Honda Guys

Motorcycle Stuff => Honda SOHC4's => Topic started by: lazyguy400F on March 28, 2008, 02:21:50 PM



Title: carb balancing...
Post by: lazyguy400F on March 28, 2008, 02:21:50 PM
    As the idle speed tends to zoom up and down randomly at times, I figure a good balancing would help, (once I make sure my boots aren't leaking).  Does anyone have a balancer they would be willing to lend out, or know a good place to pick one up, along with the mystical secrets of the process? My old mechanic way back when insisted that mere mortals could never manage it, but I figure it's just a variation of "keep fiddling 'til it's right."

    And any advice on how wrong my diagnosis is is always welcome- my car mechanic knows that if I say I'm pretty sure it's the transmission, it's undoubtably the wiper motor or a flat tire. ??? :-\ ;D

     thanks, peter

   


Title: Re: carb balancing...
Post by: S-Dog on March 28, 2008, 03:32:00 PM
you could always just bench sync it to see if its close...


Title: Re: carb balancing...
Post by: andy750 on March 28, 2008, 04:06:52 PM
Peter!
I have a Morgan carb tube you can borrow. Its easy to use and comes with simple instructions. As long as you have a CB400 manual you will be good to go - play with it till your hearts content. Im in Roslindale and will be home all weekend or if you can wait I can meet you somewhere in the next week or so. Im recovering from surgery at moment so cant travel so far.

cheers
Andy

Ive sent you my cell number by PM



Title: Re: carb balancing...
Post by: lazyguy400F on March 28, 2008, 05:37:11 PM
     Thanks, Andy-  I'll give a call over the weekend if I can, depending on the chaos level here. If not, a week or two shouldn't matter much. I've got the original manual as well as an old clymer.  Hope your recovery is speedy.

     And pardon my ignorance, but is bench-synching just setting all the adj screws the same? or is an actual bench involved?


Title: Re: carb balancing...
Post by: frostypuck on March 28, 2008, 07:10:43 PM
     Thanks, Andy-  I'll give a call over the weekend if I can, depending on the chaos level here. If not, a week or two shouldn't matter much. I've got the original manual as well as an old clymer.  Hope your recovery is speedy.

     And pardon my ignorance, but is bench-synching just setting all the adj screws the same? or is an actual bench involved?

You can bench synch the carbs on the bike if you can remove the airbox without difficulty. It basically entails using a very small diameter drill bit type thing as a gauge to set all the slide openings to an equal level without using the mercury sticks. It's better if the carbs are off the bike, a good place to begin after a rebuild. Actual carb synching should take you no more than 15-20 minutes once you've set-up. (On the 400 you'll definitely want longer fuel lines or an aux. fuel container.)
Good luck,
Chris