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Motorized Cruiser Bicycles The beach cruiser has always been great bicycles to motorize. They just look good with a motor. Use this section to share and discuss about motorizing this classic.

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Old 06-10-2010, 05:00 PM
BADBOOH's Avatar
Motorized Bicycle Elite Member
Join Date: Apr 2010
Location: San Diego CA,
Posts: 273
Default Looks good but is slow...

My bike to me looks great, however she is a slug... Can't get her to go over 20, Tried all kinds of things, changed the carb to the new style speed carb, a little improvement top end, but have sacraficed torque. If I turn the fuel shut off valve off she goes up to 28 until the feul runs out, then turn the fuel valve on again and back to a slug... Maybe its a bad motor? She has 560 miles on her and runs great, as far as being reliable for these things. I guess she is what she is. Have a group ride coming up on the 20th, guess I'll take up the rear and cruise. Open for any suggestions.
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Old 06-10-2010, 08:41 PM
carpetrugger carpetrugger is offline
Motorized Bicycle Newbie
Join Date: Apr 2009
Location: Calif.
Posts: 13
Default Re: Looks good but is slow...

I'm pretty sure your engine is flooding, you say you get a some improvement at wide open throddle. Running a flooding engine at wot will clear the extra fuel unflooding the engine. The real sign that you have a flooding condition is that it clears up completly and runs great as its running out of fuel, once the fuel quits running in to the carb its left with just the fuel in the bowl. With no fuel entering the carb it can't flood itself out and runs like it should. Check the neddle an seat, float adjustment, also check for a leeking float. Turning the fuel off while the engine is running is how I test for a flooding condition, If the engine smooth's out and the rpm's pick up I know my engine is being flooded. Don't forget each time you let it run out of fuel it's also running out of oil!
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Old 06-10-2010, 09:03 PM
captainrichhill captainrichhill is offline
Motorized Bicycle Elite Member
Join Date: May 2008
Posts: 203
Default Re: Looks good but is slow...

Check the float height. You may want to try bending the little tabs in the floatbowl down a few mm. This will not allow the float bowl to fill quite as much and it might lean it out a little for you.
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Old 06-10-2010, 10:19 PM
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bairdco bairdco is offline
a guy who makes cool bikes
Join Date: Aug 2009
Location: living the dream in southern california
Posts: 6,258
Default Re: Looks good but is slow...

sounds like it's running rich. closing the petcock leans it out as it burns the fuel. where's your needle-clip set? try moving the clip up a notch and see what happens. if it goes faster, check your plug. if the plug is still black, oily, or dark brown, go up another notch. you want the plug cocoa colored. any lighter and you're too lean.

oh, and i forgot to tell you to check your plug before you move the clip. if it's already light tan, then you got a slow motor, and we'll have to figure something else out.

and, what mixture are you running? you should be at 32:1 after that many miles. if you're running it with more oil than that, it's too rich.
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