Kawasaki Sportsbike Riders Club - Australia - Online Forum

Greenblood wrote:Well after all the time spent looking for the bits, then the time spent getting them together. A test run was the go before all the wiring was
finalized, what a bummer the standard ZX7R starter motor was not strong
enough to turn the bike over. Now I am looking for a starter motor from a
car. something I can get a 5/8 sprocket fixed to ( no shroud over the shaft ) has anyone got any ideas?

Neka79 wrote:umm im confused...u built a motogp bike & need a starter??

Greenblood wrote:Thanks SnypR
Will have a look at the local wreckers. Am also looking at a winch motor
if I can find one that would be ideal.

Strika wrote:

Greenblood wrote:Thanks SnypR
Will have a look at the local wreckers. Am also looking at a winch motor
if I can find one that would be ideal.

Are you activating the bike with a rear tyre spinner, or are you utilising the crank end or gearbox sprocket to start it???

the reason I ask, is that those moto GP/SBK starters actually don't have much torque. They rely more on the speed at which it spins the rear wheel to get them going. Except that Suzuki one that turns the crank!!!

Seriously I thought a 4 cylinder starter would have more than enough grunt!!!!

photomike666 wrote:Isn't this effectivly bumpstarting the bike? Isn't that supposed to not work on fuel injected engines? Or is that just the flat batt syndrome? Have you tried changing the gear ratio, make the winch motor run eaiser but for longer? Maybe it simply runs too slow. 4.5hp is ok, but it may need to physically turn the wheel faster. A bump start works at a run not a walk.

Greenblood wrote:

Strika wrote:

Greenblood wrote:Thanks SnypR
Will have a look at the local wreckers. Am also looking at a winch motor
if I can find one that would be ideal.

Are you activating the bike with a rear tyre spinner, or are you utilising the crank end or gearbox sprocket to start it???

the reason I ask, is that those moto GP/SBK starters actually don't have much torque. They rely more on the speed at which it spins the rear wheel to get them going. Except that Suzuki one that turns the crank!!!

Seriously I thought a 4 cylinder starter would have more than enough grunt!!!!

That means it's not spinning the tyre fast enough. Have a good look at the starters at the next GP, they spin the rears rather fast, then literally pop the clutch to kick em over!! I'd say as an uneducated not being there or knowing anything about your set up............it's not spinning it fast enough.

If you use a high torque low revs electric motor for the application, all you will get is slip from the starter to the tyre. Better to have the bastard spinning hard then pop the clutch!!!
I am spinning the rear wheel but it dosen't want to turn the crank
over when I let the clutch out.

Strika wrote:

Greenblood wrote:

Strika wrote:

Greenblood wrote:Thanks SnypR
Will have a look at the local wreckers. Am also looking at a winch motor
if I can find one that would be ideal.

Are you activating the bike with a rear tyre spinner, or are you utilising the crank end or gearbox sprocket to start it???

the reason I ask, is that those moto GP/SBK starters actually don't have much torque. They rely more on the speed at which it spins the rear wheel to get them going. Except that Suzuki one that turns the crank!!!

Seriously I thought a 4 cylinder starter would have more than enough grunt!!!!

That means it's not spinning the tyre fast enough. Have a good look at the starters at the next GP, they spin the rears rather fast, then literally pop the clutch to kick em over!! I'd say as an uneducated not being there or knowing anything about your set up............it's not spinning it fast enough.

If you use a high torque low revs electric motor for the application, all you will get is slip from the starter to the tyre. Better to have the bastard spinning hard then pop the clutch!!!
I am spinning the rear wheel but it dosen't want to turn the crank
over when I let the clutch out.