Starting the motor

Midwest Autowerks · Mar 8, 2009

I am looking at an 80cc motor here and I am wondering how these engines are started

it says you can do pedal starts and so on
I was thinking of removing the pedals all together here

are they pull start or is there an ignition key? I am completely noobish at this but I appreciate any and all help. thanks

toytime · Mar 8, 2009

You need to peddle to start but there is a pull start available for around ten bucks or so.
You also need to peddle the bike to get going with these kits unless you get a jackshaft kit from sickbikeparts. It allows you to use your rear gears but you need to keep your crank in place. I just tried this morning and I can start off in first gear without helping the bike to start off.
Why do you want to remove the peddles?

deacon · Mar 9, 2009

the only time i hated my pedal start is when something was wrong with the engine. usually it was a clogged fuel line or out of gas but still it is a pain.

2door · Mar 9, 2009

Check your local laws pertaining to motor assisted bicycles. If you remove the pedals, bad idea, then your bike will not legally or technically be a bicycle anymore. It could fall under the heading of a motorcycle. In additon to the laws, having the option of pedaling can be a blessing in the event you have mechanical/engine problems far from home. Most will agree here; Keep the pedals.
Tom

Midwest Autowerks · Mar 18, 2009

I am going to keep the pedals, i bought this 80cc kit on ebay and I am wondering how a pedal start works, do you pedal then hit the yellow throttle switch to fire the motor?

toytime · Mar 18, 2009

The botton is your kill switch to turn the motor off. To start you "bump start" it.
You start to peddle and when rolling you pop the cluch and the motor starts.
It's very simple.
You may want to spend a few hours on this site; Versionate - Document sharing & collaboration, the easy way for groups to share document and files.

2door · Mar 18, 2009

Toytime,
That is a great site. It should be required reading for every new member and even the old timers might pick up a thing or two they've forgotten over the years. It should be posted here someplace that is apparent and easily located by folks just getting started or are contemplating getting into this hobby. I copied it to 'My Favorites' for quick reference. Thanks for posting it.

Midwest Autowerks · Mar 19, 2009

exactly what I needed, thank you a lot .bld.

one more thing....

when I look at the small sprocket that comes right off the engine, you can't turn it by hand, it is like it is in gear or something... do you just need to hook the chain up and pedal it? That is the only thing I am really unclear on, I appreciate the help

TigerToothBikes.com · Mar 20, 2009

2door said:
Toytime,
That is a great site. It should be required reading for every new member and even the old timers might pick up a thing or two they've forgotten over the years. It should be posted here someplace that is apparent and easily located by folks just getting started or are contemplating getting into this hobby. I copied it to 'My Favorites' for quick reference. Thanks for posting it.

Thats why its posted in "recommended reading" http://motorbicycling.com/f3/recommended-reading-6756.html check it out for more essential info. Hopefully an admin will make it a sticky.

lordoflightaz · Mar 20, 2009

Midwest Autowerks said:
exactly what I needed, thank you a lot one more thing....

when I look at the small sprocket that comes right off the engine, you can't turn it by hand, it is like it is in gear or something... do you just need to hook the chain up and pedal it? That is the only thing I am really unclear on, I appreciate the help

When you are looking at it you have the clutch cover off so the clutch is engaged. You could use the included spark plug wrench to turn it, but by hand you just aren't strong enough. BTW that is a good way to feed the drive chain onto the sprocket, with that spark plug wrench.

4yk4a · Mar 23, 2009

Toytime,thanks for the manual!

Midwest Autowerks · Mar 31, 2009

I am near completion, I think you guys will like this thing, its a custom frame built bmx with an 80cc on it, WITH pedals, everything is in really tight tolerances but fits very wel

skjjoe · Mar 31, 2009

post pics when your done .rd.

Midwest Autowerks · Apr 5, 2009

lordoflightaz said:
When you are looking at it you have the clutch cover off so the clutch is engaged. You could use the included spark plug wrench to turn it, but by hand you just aren't strong enough. BTW that is a good way to feed the drive chain onto the sprocket, with that spark plug wrench.

still I dont understand. My bike is completely assembled, chains have good tension, but if I try pedaling, the motor starts turning over, it is very difficult to pedal, pulling the clutch cable doesnt make any difference I dont think. It is like the thing is in gear and I cant just pedal the bike normally

Is this common? it confuses me, do I need to do something with the clutch? :-||

toytime · Apr 5, 2009

Why don't you pull the clutch in, leave it locked and see if you can now push the lever on the engine in some more and see if it helps. These clutches always have tension on them, there is no free play and the cable always feels tight, don't let that fool you.
Have you started the bike? I have heard of them being "stuck" or locked when new and guys seem to free it up once it starts up.

Cabinfever1977 · Apr 5, 2009

pull the clutch in and lock it,if that dont work you will need to adjust your clutch cable.no its not very fun.its more work than adjusting the brakes on a bike.
post pics id like to see that bmx with a engine.

Midwest Autowerks · Apr 13, 2009

Can you explain a bit more for what you mean by "locking the clutch"? I can shorten up the cable probably, just pull it through the housing a little farther. I need to be able to pull that clutch cable, pedal the bike, then release the handle in order to start the motor. but as it is, I can't pedal with the clutch tension right now.

toytime · Apr 13, 2009

Locking the clutch is when you pull in the lever on your handle bars and it "locks".
Yes, you need to shorten the cable as the clutch isn't being pulled in as far as it should because the cable is too long.
Easiest way is to have a pal push the lever on the engine over so that you can slide that cable end over some more. It's a common problem and you will "get it".

Cabinfever1977 · Apr 14, 2009

there will be some clutch rubbing at first,because u need to break her in.it will be hard to peddal at first,thats why i bought the dual start model and use the pull start.
and oh yes i did shorten the clutch cable(it wouldnt work before,too hard to pull)and works better when shorter.

Midwest Autowerks · Apr 18, 2009

got it, but I need to remove the drive sprocket for a little bit to do a modification, and you'll see why when I am done, but the sproket is held on by a key of some sort, does anyone know how to remove it?

Starting the motor

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