Re: balancing carbs on R90/6


"Rob Kleinschmidt" <Rkleinsch1216128@xxxxxxx> wrote in
news:1146249895.002509.18130@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
gabe2004@xxxxxxxxx wrote:

However, there is a lag between when I open
up the throttle and the engine responds. It's very noticible. I was
thinking that the carbs might need to be balanced. I've never done it
before. Any advice on the best way to do it?

Two basic techniques (bear with me if I'm missing an R90 peculiarity)

1) Vacuum balance. You attach a vacuum gauge to a little port on
the underside of the carb and fiddle with the idle adjustments
until the two carbs are drawing equal vacuum.

<snip>

I guess it is self evident but if the OP is a real newby it might
be worth mentioning.
After you get equal idle performance on both carbs, you need
to make sure the throttles open up at exactly the same time
when you twist the throttle grip. Either you eyeball it or you
do renewed tests at very low throttle. You adjust the cable
free play at each carb to get it right.
Typical symptoms when this is wrong on a boxer is both lag
and a sort of shudder at low throttle openings (the boxer
effectively being a thumper).

--
Ole Holmblad - Göteborgs Prima MCK / MK Pionjär
TDM850 / TT600R FL#44 OTC#489 UKRMSBC#08
SGFPTH#00 Remove hat to answer by mail


.

Relevant Pages

  • Johnson outboard bogs down [Repost]
    ... My son has a circa 1985 Johnson 70 HP two-stroke outboard motor. ... sort of protective solution into the carbs when he stored it for the winter ... He's also emptied the fuel tanks and added fresh ... synchronizes the throttle to the carbs is pretty solid so we don't think we ...
    (rec.boats)
  • Re: Johnson outboard bogs down [Repost]
    ... My son has a circa 1985 Johnson 70 HP two-stroke outboard motor. ... sort of protective solution into the carbs when he stored it for the winter ... synchronizes the throttle to the carbs is pretty solid so we don't think we ... This is all aside from proper timing which is checked first. ...
    (rec.boats)
  • Re: Johnson outboard bogs down [Repost]
    ... My son has a circa 1985 Johnson 70 HP two-stroke outboard motor. ... sort of protective solution into the carbs when he stored it for the winter ... There doesn't seem to be a way to adjust the fuel/air mixture on these ... synchronizes the throttle to the carbs is pretty solid so we don't think we ...
    (rec.boats)
  • Re: Stuck/Frozen carb butterfly valve
    ... The throttle was stuck closed, and some digging around showed it ... B-12 won't hurt any rubber part that hasn't already perished from ... If the carbs are off the machine don't break the individual carbs apart ... solutions are in tanks intended for cleaning automobile carburetors. ...
    (rec.motorcycles.tech)
  • Re: Balance, Grip, Throttle, and Crash
    ... > CB600F has a small bit of slack before opening up the throttle. ... > like I'm loosing balance, I tend to grip the handle bars a bit more. ... U.S. taxpayer dollars spent each DAY in Iraq? ... there is no limit to the innocent lives they are willing to ...
    (rec.motorcycles)