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    Compression Problems

    DDave; It is important to position all parts, as when the engine was running; just in case there is a difference in something, such as a warped cylinder head. You didn't have the piston out of the engine did you? If you could make up a fitting that screws into the spark plug hole that you get...
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    Compression Problems

    DDave: Did you use a new head gasket when you reinstalled the head? Also, did you put the head on the cylinder in the same position as it was originally? BMF
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    Chain tensioners

    Skipu; you are really into motorized bikes and for me, this was my first build, using a discarded (found at the curb) Huffy Stone Mountain, mountain bike. Therefore, I never hesitated on the welding on of my chain tensioner as this bike will probably never be without the China girl engine...
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    Chain tensioners

    I see no need to make a complicated, spring tension adjustable chain tensioner. I made mine similar to abikerider, post #43 except that I welded it to the bike frame; no movement whatsoever. Some slack in the chain is desired; like said before me, a tight chain puts additional wear on all...
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    Chain tensioners

    59Poncho; I made up a chain tensioner that goes between the seat and chain stay and I welded it in both positions. Needless to say, it never moves on me! I have a slot in it for the roller, as the orginal does that is supplied in the engine kits for chain adjustment. BMF
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    Tensioner - Chain wrecked

    This is for CMP: I believe that a chain tensioner is necessary for an easy adjustment for chain wear. As chains wear, they get longer and therefore, will require some easy way for adjustment; this is where the chain tensioner comes in. The one supplied with my engine kit never worked for me...
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    clutch question

    NBD: Greg58 gave you some good links to check out in regards to your clutch situation. When I did my build, I did not use the long compression spring that is used at the engine end of the cable. I see no need for it as the clutch pressure plate provides this pressure. If this spring is used...
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    clutch question

    NBD; is this a Chinese 66cc engine (kit)? Giving us more info will allow us to help you better. BMF
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    E-bike rider dies in Windsor Ontario Canada

    Thanks Rockenstein for the links to the newspapers in this matter of the E-bike crash in Windsor; lots of good information. I would be interested to hear how the driver of the SUV makes out legally in this matter. I have several different motorcycles and one Chinese engine 66cc powered...
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    Tensioner - Chain wrecked

    I run a 415H chain using a home made tensioner with roller with absolutely no problems. The 415H chain is strong and its rollers are 3/16" wide unlike the #41 chain whose rollers are 1/4" wide. A narrower chain means more clearance with the rear tire sidewall and fits both sprockets better. BMF
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    E-bike rider dies in Windsor Ontario Canada

    I live near the Detroit (MI) area and am able to receive so AM radio broadcasts from Windsor Ontario, Canada. Two days ago, they reported that a E-bike rider and auto collided, killing the rider on the E-bike. This radio program took calls from listeners for two hours, asking for their...
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    Tensioner - Chain wrecked

    Well CMP, you were very lucky that you weren't seriously hurt do to that drive chain mishap! I believe that a drive chain tensioner is required; some others say not. Chains will stretch as they wear, and some sort of adjustment will be required. When using a plastic roller adjuster, a simple...
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    New Whizzers, any thoughts on them?

    I don't know if I can show that Web site here, but I'll give it a try; it looks good to me, check it out and please comment: http://www.extreme-scooters.com/whizzerindex.htm BMF
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    hello from michigan

    Hello Oldpot; The link that you posted shows bikes with a top tube that slant downward towards the seat post at a pretty steep angle. Remember, if you are going to be working with a 66cc Chinese engine kit, you will need room to fit the engine in the frame! My motor bike is near Lapeer, MI...
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    New Whizzers, any thoughts on them?

    I see a Web site here in the USA for the new Whizzer, model "Original" for about $1399.00 and that includes shipping. Price, photo, and description look good, has anyone purchased one of these motor bikes; your thoughts please. BMF
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    what did you do to your motorized bicycle today?

    Re: what did you do to your motor bike today? Keep that broken vice for your next trip to the metal scrap yard; they'll pay you a bit of cash forit that you can put towards one, hopefully, that is not made "off shore"! I use a vise today that I got from my dad who got it from his dad and who...
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    Spring Return Chain Tensioner

    I believe that the engine drive chain tensioner is one of the critical items on a Chinese 66cc engine build! I used the kit supplied tensioner with poor results; it would not stay in position and if it ever turned into the spokes, well, I guess we all know what would happen then! I fabricated...
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    Michigan Motorized Bicycle laws, what are they?

    Re: Michigan MB laws, what are they? LRJerry & BikeGuyJoe: I have a moped that is licensed here in Michigan so I am good to go there. When I am completely finished with my MB build, I will take photos and check with my local licensing folks. One of my MB accessories will include a holder for...
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    Lock your bike to a non movable object

    2stroker; Your engine setup looks good and is a great idea! I ride my mountain bike on dirt and sometimes muddy country roads so a engine system that drives against a tire would not work for me. My little 66cc China girl does a great job in my situation for me. I keep it in a locked barn when...
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    Michigan Motorized Bicycle laws, what are they?

    I find that reading the MB laws in this forum for various states to be very interesting and different. I have been riding my 66cc Chinese engine powered mountain bike in the country (Michigan) and I am lucky to even see a car, not alone a police car/officer but one day, I suspect that I...