Balancing carburettors
Posted by: Fisbey on 27 February 2006
A friend has just bought an old Suzuki 750 and wishes to balance the carbs, however the compression is a wee bit down on two of the post. My question is does the compression being a bit low affect the carburettor balancing (via vacuum gauges)?
Posted on: 27 February 2006 by Mike Allen
I havent balanced carbs for over 20 years now, but when we did (on Cars), it was crucial that compression was equal across all pots. If only one or more was down, then that had to be investigated first. I wouldnt think the basic principle has changed over the years, and cant see why it would be any different for a bike.
Mike.
Posted on: 27 February 2006 by Mark Dunn
Hi Fisbey,
"A wee bit down" covers a lot of ground. If it's no more than say, a 10% difference between pots just ignore it, - or get it tuned on a dyno. On an old Suzi 750 (which model?) the compression ratio will be relatively low (as compared to modern bikes), so I doubt it will make a big difference. However, getting the balance right, - everything else being equal - *will* make a big difference to smoothness and rideability.
Pity me, my Honda Valkyrie has 6 cylinders and 6 carbs.
Best Regards,
Mark Dunn
Posted on: 28 February 2006 by Basil
"A friend has just bought an old Suzuki 750"
Is it one of the old water cooled triples? Or the later GS four cylinder 4 strokes?
There is an easy (ish) way to check that involves using a drill bit as a spacer to check that all the carb "slides" are open the same ammount. It seemed to work ok on my old Honda 550 and Kawasaki Z900 & 750 triple!
Posted on: 28 February 2006 by Rasher
quote:
Originally posted by Basil:
It seemed to work ok on my old Honda 550 and Kawasaki Z900 & 750 triple!
You got a Quacker H2?!!!
Suicide machine if ever there was one.
Posted on: 28 February 2006 by Basil
quote:
You got a Quacker H2?!!! Suicide machine if ever there was one.
Had, for a fairly short time! I remember thinking that the guy I bought it from seemed very eager to sell it!
It
was immense fun, as long as you never, ever turned your back on it!
It also helped that I'd had regular use of a friends Yamaha YR5! As you know of the reputation of the Kawasaki triples, I'm sure you've heard of the YR5!
Posted on: 28 February 2006 by Rasher
The days of air cooled 2-strokes seem a very long time ago. I had a soft spot for the Suzi GT380 too. I had a friend who sold me his RD125 so he could get the 350. I was 17 and used to go on the back with him, and I loved it. I wouldn't do it now though!
Posted on: 28 February 2006 by Fisbey
It is a 750 Katana - four stroke four cylinder.
