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what is a good brand for a motor kit

2 stroke motorized bicycle engine kits need careful installation and setup, find out how from our professionals here!


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  #1  
Old 06-02-2010, 03:28 AM
mikeread mikeread is offline
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Default what is a good brand for a motor kit

Right now I'm looking at geting a kit from bikemotorkit.com or bikeberry.com but before I buy I want to make sure I am getting a good kit. I'm looking at getting a 60cc or larger motor and don't want to pay over $200.
Any thoughs?
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Old 06-02-2010, 04:12 AM
city of angels city of angels is offline
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Default Re: what is a good brand for a motor kit

usabikemotors.com has a starfire motor for around 185. plus tax i really like them ihave mine for around 4 months on my trike and i really like it
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Old 06-02-2010, 04:46 AM
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Default Re: what is a good brand for a motor kit

Look in the swap and shop, I have a few for less than that by a long shot.
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Old 06-02-2010, 04:46 AM
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moronic_kaos moronic_kaos is offline
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Default Re: what is a good brand for a motor kit

I got one off eBay from a guy called BoyGoFast. Love the motor, but hate the kit.

If you're using a cruiser bike, look at what they're giving you for an extended frame adapter. If it's a piece of sheet metal with a long bolt going through it, that's no good (they want you to drill through your frame and run that bolt through it). What you want to see is a muffler clamp-looking thing (U-bolt) and a peice of sheet metal, as the u-bolt just clamps around the frame.

Also check out the exhaust. I got a black one & there was no way to take it apart to clean, and the end ended up popping off after less than 10 miles. Plus the black painted exhaust usually starts peeling when it gets hot and looks like crap.

I hear that the black clutch lever is supposed to be a little more beefy than the stock one with the chrome handle, but I've never seen the black one

Gas tanks come in 2 or 3 sizes, get the biggest one you can for obvious reasons.

Brass pet-cocks (gas shutoff valves) SUCK! It's nice that the filter is inside the tank and out of the way, but its like having a piece of shrapnel stuck out of the bottom of the gas tank. Every time I pedal it digs a hole in my pants, and sometimes my leg will bump it to the off position accidentally.

Chain tensioner. This is quite the interesting topic. There's two different ones that I've seen. There's one with 2 bolts and one that has 4 and uses 2 brackets on the back. I personally recommend the one with 2 bolts, as the one with 4 though it looks like it should be beefier, but the bolts are actually quite small and you can never torque them enough without stripping them. Wrap the frame where it mounts to with gasket paper and you wont have all the problems with it moving that others have had on this board.

Chain size is another issue. There's two different kinds, a 415 chain (heavy) and another that's like a bicycle chain. The bicycle chain one a lot of people hate because everything has to be aligned so perfectly for it not to fall off.

As for the motors, there's a few things to look for but it's hard to get good info before buying. I like square clutch pucks (the pads inside the clutch are either square or round, the square have slightly more contact area), clutch arms that don't have a slot, just a hole (pain to install, but less of a chance of snapping), thicker studs are always nice. Don't know if it's true but a lot of sites talk about having thicker studs.

And I like the straight heads believe it or not. The slant heads (heads where the CORRECTION: SPARK PLUG (got it right this time) is installed at an angle) get all cracked up on the inside and someone told me they sometimes come warped. These motors have some real cheap casting jobs, and the less complicated and curvy they are, the better. I've done a conversion and the difference in power isn't noticeable, so I don't find it worth risking the integrity of the motor. Clearance would only be an issue if using a very small mountain bike frame, or maybe a certain style of chopper bike.

Oh. I've seen motors that have no intake piece (angled pipe fitting between carburetor and motor), though I'm told they don't sell these anymore. DO NOT BUY THESE!!! They suck to work on. Every time you want to get the carb off for cleaning or whatever, you have to unbolt the cylinder and pull it up about an inch for it to clear the clutch cable run.

Last edited by moronic_kaos; 06-02-2010 at 08:18 AM. Reason: Don't ask
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Old 06-02-2010, 05:13 AM
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K.i.p K.i.p is offline
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Default Re: what is a good brand for a motor kit

"slant heads (heads where the piston is installed at an angle) ".....um no. I think you meant spark plug.
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Old 06-02-2010, 08:16 AM
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Default Re: what is a good brand for a motor kit

Wow, I think I made that correction on the wrong thread. There was another where I was talking about rounded top and flat top spark plugs

So much for that...

Last edited by moronic_kaos; 06-02-2010 at 08:19 AM.
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Old 06-02-2010, 06:08 PM
mikeread mikeread is offline
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Default Re: what is a good brand for a motor kit

thanks this has been really helpful! the motor from usabikemotors.com does sound like a really good motor...
this comes as a complete kit or is it just the motor? GT4 66cc Standard GT4 Standard [StarFire] - $185.00 : USABikeMotors, Your source for Grubee StarFire Bike Motor Kits, Parts, Service
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Old 06-02-2010, 06:29 PM
city of angels city of angels is offline
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Default Re: what is a good brand for a motor kit

its the whole kit
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  #9  
Old 06-02-2010, 09:25 PM
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Default Re: what is a good brand for a motor kit

It's the kit, but it doesn't tell you a heck of a lot about it.
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Old 06-02-2010, 09:47 PM
city of angels city of angels is offline
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Default Re: what is a good brand for a motor kit

well let me tell you about this kit is give you the option to run duall brakes set uplus it has the new speed carbutator plus it has one of the best chain set up i have seen is better than the 415 chain
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