Engine won't start

[Mistamilla]

I finally got my bike all together. I was waiting for awhile for the bike shop to build up my wheel on a freewheel hub made for motorbikes. They were having a bit of difficulty but it's all together now. Now the only problem is I can't turn on the engine. I was thinking it might be the kill switch, dax says to tie kill switch to blue wire, and others say the white wire. (it's a 70cc from dax) And how is it that I tie them together?

It might not be that, I don't know. I don't even know exactly how I'm supposed to turn on the engine. It's not a rope pull, I don't see any switches on the motor, and I don't think it's a pedal start. ( I hope it's not a pedal start because I have the freewheel hub so that when I pedal the bike the chain going into the engine does not turn.) I am kind of frustrated with this project, so I appreciate any help. Thanks.

 

[Ghost0]

Bad news, but these are pedal start motors. The idea is that with the clutch pulled in you start pedaling and whenever you want to start the motor just release the clutch and it starts.

The white wire is the kill switch on my bike.

 

[drimpact]

Yup, ghost is half right: "Happy Times" (dax70) needs the solid hub not the free wheel one. Those are for motors with pull starters. Dax70 is a pedal start engine.

The white wire is a 6v 3A power source for lights(not widely used). Grounding it will kill the engine, but the kill switch should get spliced into the blue(or)green wire to ground the cdi, not the Magneto like the white wire does. I tape my white wire and forget about it on my builds.

 

[JemmaUK]

Yup, ghost is half right: "Happy Times" (dax70) needs the solid hub not the free wheel one. Those are for motors with pull starters. Dax70 is a pedal start engine.

The white wire is a 6v 3A power source for lights(not widely used). Grounding it will kill the engine, but the kill switch should get spliced into the blue(or)green wire to ground the cdi, not the Magneto like the white wire does. I tape my white wire and forget about it on my builds.

umm.. I am a little confused here... if you are pedalling - ie providing torque and therefore power to the rear wheel doesnt that mean that the hub wont be freewheeling and therefore dumping the clutch should start the engine?

Being a belt kinda' girl (and no comments please.. I can just see the minds spinning) I would have thought that as long as there is still pedal action and pressure on the chain that that would mean the engine could be kicked over - isnt it only when you dont pedal that the freewheel happens?

im probably completely wrong here lol

Jemma xx

 

[mickey]

doesnt that mean that the hub wont be freewheeling and therefore dumping the clutch should start the engine?

The driven sprocket won't be turning and that's what would spin the motor. Just as on the human powered side, if you stop pedaling, your crank won't continue to turn.

 

[drimpact]

umm.. I am a little confused here... if you are pedalling - ie providing torque and therefore power to the rear wheel doesnt that mean that the hub wont be freewheeling and therefore dumping the clutch should start the engine?

Being a belt kinda' girl (and no comments please.. I can just see the minds spinning) I would have thought that as long as there is still pedal action and pressure on the chain that that would mean the engine could be kicked over - isnt it only when you dont pedal that the freewheel happens?

im probably completely wrong here lol

Jemma xx

The freewheel hub he is talking about, the freewheel is on the motor rear sprocket side(left), not the pedal chain side(right). this has to be solid mounted to the rear wheel for a happy times. The free wheel versions allow easy pedaling when the engine is turned off. On Happy times the chain moves whenever the bike moves.

 

[JemmaUK]

The driven sprocket won't be turning and that's what would spin the motor. Just as on the human powered side, if you stop pedaling, your crank won't continue to turn.

Thats what I thought, so if thats the case then keeping pedalling while you drop the clutch should mean you still have drive and therefore the wheel should kick-over the engine. Unless I am missing something massively obvious...

On the old cyclemotors such as the rudge you would pedal and while pedalling dump the clutch (or if you were lucky drop the decompressor valve) and hopefully the engine would start... generally you would disengage the clutch again and wait a little while still pedalling till it had some heat in the motor - reengage the clutch and off you go at a stately 35mph...

it sounds a shame that all that work on a freewheel hub is wasted

Jemma xx

 

[kevbo]

Unless I am missing something massively obvious...

...it sounds a shame that all that work on a freewheel hub is wasted

There are TWO freewheels on this machine, one on each end of the rear axle, so the rear wheel can drive neither the pedals or the engine, but either can drive the rear wheel.

All may not be lost, though: Isn't there a pull start add-on unit for the HTs?

If you really needed to ride much without the engine, the freewheel would be nice, as the bits between the clutch and the rear wheel do add noticeable drag. Enough that I'd take the left side chain off if an engine failure left me more than a couple of blocks to pedal.

 

[JemmaUK]

There are TWO freewheels on this machine, one on each end of the rear axle, so the rear wheel can drive neither the pedals or the engine, but either can drive the rear wheel.

All may not be lost, though: Isn't there a pull start add-on unit for the HTs?

If you really needed to ride much without the engine, the freewheel would be nice, as the bits between the clutch and the rear wheel do add noticeable drag. Enough that I'd take the left side chain off if an engine failure left me more than a couple of blocks to pedal.

Now it makes sense - I'll make the excuse that is somewhere north of 12am here... lol

Jemma xx

 

[Mistamilla]

I talked to someone today and he was saaying the same thing, that I could put on a pull start for the engine. He said though that the kits that the add on kits are horrible and don't last very long. He suggested drilling a hole in the magneto cover and adding a pull start cord from something like a chainsaw or something. I'm goin to look further into that. Thanks