MOTOGP STARTER UPDATE

[Greenblood]

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?

[Stereo]

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?

call a wrecker? They would have BUTLOADS of them..... And should be cheap..... You probably want something fairly decent, so I guess a V8 starter motor from the last 20 years should be pretty good....

[Neka79]

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

[Greenblood]

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

No I have a ZX7RR race bike ( no starter motor ) I built a MOTOGP style
starter .

[SnypR]

l own a Mazda B2200 84 model and the gearbox has the housing part on it, so the gear is exposed on the starter. Its a 4cyl diesel but being a diesel should mean it has enough to do what you want.

[Greenblood]

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.

[Neka79]

what abt a 13b rotor..thats abt all there good for...

[Greenblood]

So the latest on the starter, i fitted & wired a 4.5 Hp winch motor
the other weekend & guess what, no go
Just not enough Hp for the race bike with the big compresson.
Started the road ZX7R without a problem, what to do now?
If anyone needs a starter for a 250 or 125 GP bike let me know.

[Strika]

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!!!!

[Greenblood]

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!!!!

I am spinning the rear wheel but it dosen't want to turn the crank
over when I let the clutch out.

[photomike666]

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.

[Duane]

Bump starting FI works.

EFI maybe not

[Greenblood]

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.

The bike is a ZX7R superbike with carbs, & the battery is charged.

[Strika]

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.

[Greenblood]

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.

The problem is I need to have the bike spinning in gear to prime the oil
in the motor ( it has a kit oil pump ) with the egnition off. For 20 to 30
seconds, after a while without running ( bettween races or ride days).