Manco Dominator slow to get rolling/ low torque

[Mangumck]

Just got my Grand kids a Manco Dominator 435B with Predator 212cc engine. Very slow to get rolling, seems like torque issue. If on a incline in pasutre inpossible to get going up incline. Sprocket/ gears seem to be stock.

Clutch sprocket 10T, Reduction Sprocket 23T / 9T, Axle Sprocket 27T
Tires 145/70-6.

WHat could the issue be. Could the clutch be shot?

Also thinking of putting a all terrian type tires on rear.

Any advice and direction woiuld be greatly appreciated.

 

[anickode]

It looks like it probably had a torque converter, and now it does not. It probably failed or wore out, or didn't fit the predator and someone went the cheap route with a centrifugal clutch and another sprocket.

That's only a 6.9:1 reduction... Not a lot if the kart is being used off pavement.

Clutch could be slipping too.

If you switch to bigger tires, you'll DEFINITELY need a bigger gear ratio. I'd start with the clutch and go from there.

 

[itsid]

gearing is NOT stock!

stock gearing would be
10T -> 35T - 9T -> 27T on later models (10.5:1)
and 10T -> 35T - 12T -> 27T on earlier versions (7.9:1)

any higher gearing than that and your results are to be expected to be honest.

swap your 23T sprocket to the stock size of 35T and you should be good.

make sure whatever new tyres you mount they do not exceed 15" in diameter!
(you are now on 14")
... increasing the rear wheel diameter will result in the need for lower gearing.
an inch is acceptable I guess, but 16" or even 18" might need something like 12:1 already.


also use 420 chain, that thing is heavy thus #41 chain (looks identical but pins are much weaker) might stretch very quickly... just saying


'sid

PS yes, trying to get going with a too high ratio will eventually ruin your clutch, if that already happened is difficult to tell,
take it apart and if the inside of the bell and the shoes are discoloured straw might work, blue will likely not... swap the clutch as well, but for now I'd say it should still be good.

 

[Mangumck]

Thanks for advise. I will get it a try.

 

[Mangumck]

Where is the best place to get a 35t sprocket?

 

[itsid]

tough actually.. 5/8" bore correct?

since 420 and #41 chain run on identical sprockets.. a #41 sprocket can be found here:
https://www.usarollerchain.com/41BS...nished-bore-sprocket-p/41bs35-58-sprocket.htm

if you have a machine shop that could finish the bore (drill and ream bore to size, add keyway and tapped cross holes for the grub screws)
http://www.ebay.com/itm/NWOB-IDC-H4...ooth-B-Type-Plain-Bore-Sprocket-/182213929692

'sid

 

[Mangumck]

Thanks Sid