Honda Spree and Elite 50 Forums

On my 125cc stroker setup

1/8th mile run @ 1/2 throttle = best time of the night 10.9sec

1/8th mile run @ Full throttle = avg time of 11.15 sec



Kyrptonite has also reported fastest time with only 1/2 throtte.


Why is this?

Maybe I should try half throttle

Overcarbed?

Greetings:

That suggests it's too lean. Too much carb for the setup is also possible.
What RPM at WOT?

evilone wrote:Overcarbed?

BINGO!

You would be better off with a CV carb this big.

Bear45-70 wrote:

evilone wrote:Overcarbed?

BINGO!

You would be better off with a CV carb this big.

CV carb?

would a 28mm carb help?

Wheelman-111 wrote:Greetings:

That suggests it's too lean. Too much carb for the setup is also possible.
What RPM at WOT?

The highest RPM @ Wide open is 10300 with 9.1 gears.

I suspect that my current pipe make little to no power after 9500.

Holding it at half throttle kinda put me in the "sweet spot" for longer. Max revs @ Half throttle was 9800rpm

Trafficjamz wrote:

Bear45-70 wrote:

evilone wrote:Overcarbed?

BINGO!

You would be better off with a CV carb this big.

CV carb?

would a 28mm carb help?

A CV carb has a normal throttle valve, but the slide is controlled by the a vacuum diaphragm. This makes the engine only see as much the carb as it can handle. CV carbs are used on Quads and 4 stroke scooters.

Bear45-70 wrote:
You would be better off with a CV carb this big.

CV carb?

would a 28mm carb help?

A CV carb has a normal throttle valve, but the slide is controlled by the a vacuum diaphragm. This makes the engine only see as much the carb as it can handle. CV carbs are used on Quads and 4 stroke scooters.

Oh Yes I have lots of those.... most are from 50cc gy6 china copies.

Should I get one for the 150cc gy6

They make very big CV carbs, Harley Davidson runs a pair of 40 mm CV carbs. My 250 4 stroke quad has a 32mm CV carb while my 400 (actually 376 cc) 4 stroke has 34 mm CV carb. You can't make the motor stumble by crashing the throttle wide open.

Trafficjamz wrote:

Bear45-70 wrote:
You would be better off with a CV carb this big.

CV carb?

would a 28mm carb help?

A CV carb has a normal throttle valve, but the slide is controlled by the a vacuum diaphragm. This makes the engine only see as much the carb as it can handle. CV carbs are used on Quads and 4 stroke scooters.

Oh Yes I have lots of those.... most are from 50cc gy6 china copies.

Should I get one for the 150cc gy6

I have no clue how big the carb is for the 150cc gy6? But go at least as big as you have now.

Trafficjamz wrote:On my 125cc stroker setup

1/8th mile run @ 1/2 throttle = best time of the night 10.9sec

1/8th mile run @ Full throttle = avg time of 11.15 sec



Kyrptonite has also reported fastest time with only 1/2 throtte.


Why is this?

what size carb and what pipe are you using with your 125cc setup?

bakaracer wrote:

Trafficjamz wrote:On my 125cc stroker setup

1/8th mile run @ 1/2 throttle = best time of the night 10.9sec

1/8th mile run @ Full throttle = avg time of 11.15 sec



Kyrptonite has also reported fastest time with only 1/2 throtte.


Why is this?

what size carb and what pipe are you using with your 125cc setup?

30mm oko carb

Bear45-70 wrote:

Trafficjamz wrote:

Bear45-70 wrote:
You would be better off with a CV carb this big.

CV carb?

would a 28mm carb help?

A CV carb has a normal throttle valve, but the slide is controlled by the a vacuum diaphragm. This makes the engine only see as much the carb as it can handle. CV carbs are used on Quads and 4 stroke scooters.

Oh Yes I have lots of those.... most are from 50cc gy6 china copies.

Should I get one for the 150cc gy6

I have no clue how big the carb is for the 150cc gy6? But go at least as big as you have now.

My gy6 150cc engine came with a 24mm cv carb on it.

what size inlet is on that pipe? have you tried changing the main jet by going smaller or larger? what temps are you seeing at wot?