How to tune a carby engine bike?

Gidday,

I know you can buy a timing gun / compression thingy for a cage ( have done
that before I saw the light ) but how easy is it to do the service on a
bike?

Changing oil if fine, but the actual tune of the engine. What sort of
equipment do you need for that?
Is it specialised for a bike?

 

In aus.motorcycles on Thu, 29 Jan 2004 14:42:15 +1100

4 stroke engine is 4 stroke engine.

How easy it is to work on depends on how complex it is.

My stone age pushrod Guzzis with their easy-to-get-at carbies (and
electronic ignition, yay!) are dead easy compared to a Ram Air DOHC
wildly timed your-hands-have-to-be-tiny-to-work-on-this multivalve
multicarbed (fuel injection is, I believe easier than carbs)
multicylinder sportbike.

So start off by saying what bike you have, and whether you want to
service it or hot it up.

Zebee

 

You need a set of vacuum gauges ($150-ish). These plumb into each cylinder's
intake manifold and register how hard they suck. You then use a screwdriver
to twiddle little linkages between the carbs to align their butterflies
until they all suck equally hard. Job jobbed. The bike should idle more
smoothly, start more easily, and pull more instantaneously when coming off
closed throttle.

You don't need a timing gun because the ignition is operated by a computer
triggering off a sensor on the end of the crank; no spinning mechanical bits
to get knocked askew.

 

http://www.factorypro.com/tech/carbtune,CV,high_rpm_engines.html

http://www.factorypro.com/tech/carbtune,CV,lower_rpm_engines.html

Daron

 

After you've split the cases and fine-tuned the gearing by very careful
jetting, it should just all fall into place.

Or so I'm told. Never been game to try it m'self.

 

Yeah, thats about it - its easier on a Yamaha, they come with three
tuning forks...

big (My Honda just came with this stupid chicken wing!)

 

This is for a specific bike it take it? I find a timing gun quite a handy
tool.

Hammo

 

If you have to ask then don't attempt it.

Rob

 

Yeah. And what about the carbs without butterflys?

(since this guys seems to think that a carb is a carb)

 

Intact Kneeslider wr

The sick bored person who is only writing this stuff case too crappy to
go for an actual ride

And I have just as many cv carbs as flatslides to tune - the major
difference between the two being:
I do the flatslides by swearing at them (LOTS) in the garage
I do the CV carbs by taking the bike to Lloyd and saying "you tune
this - I couldn't be bothered messing it up myself".

fair enough

K

 

I'm disappointed my kwaka didnt come with a tractor.

(who wants a harley anyway?)

 

A tractor ? Kawasaki heavy industries make seriously **** off big BOATS...

JL
(but like you said who wants a harley)

 

I had a chuckle when I saw the Kawasaki name/logo on the subway trains
in New York yesterday

big (they oughta paint them green and write "Ninja" down the carriges!)

 

A tractor ? Kawasaki heavy industries make seriously **** off big BOATS...

Have fun over there, oh and can the trains mono? or are they shafties.

Mike.S

 

No - they're train drive!

Boom! Boom!





-------------
Kevin Gleeson
Technical Director
Blue Rocket Productions
Hobart, Tasmania, Australia
www.blue-rocket.com.au

 

I'll bet they corner well.

Theo

 

Like they're on rails in fact ...

Cheers


(I just couldn't help myself could I? I'll give you the hook back next
week Theo.)N


-------------
Kevin Gleeson
Technical Director
Blue Rocket Productions
Hobart, Tasmania, Australia
www.blue-rocket.com.au

 

In aus.motorcycles on Tue, 10 Feb 2004 02:37:19 GMT

Yup. Like they are on rails.

especially surprising considering they tend to have narrow hard tyres.

Zebee

 

X-No-archive: yes
Kevin Gleeson wrote;

You lie! I've been to the drags and them rails don't corner very well at
all!
Clem

 

Leave the towers out of this...


Postman Pat