80cc Bicycle Engine Kit Updated 2 Stroke Motorized Bike Motor Kit for 26" to 28" Bicycles Petrol Gas Powered Bicycle Motor Kit Upgrade with Digital Speedometer & 2.5L Fuel Tank

Works great went with the 80cc. Plenty fast and a lot more reliable than the 100cc in my opinion. No issues, use it everyday 10-50 miles a day. Be prepared to buy rear tires and chain tension rollers as they do wear out fairly quickly depending on the quality in which you purchase. I use street rear tire and mountain front now. Front so it can still grab in different terrain and rear street just because I was wearing mountain ones out quicker since I mainly ride on the street. ONLY downside I had was my air filter does not fit because the frame is too close (26in bike). So I made something that would work but motor hates it (starves for air) and runs like shit. So I don’t use one but, I dont ride it in the sand or fine land like that so it doesn’t get sucked into the engine. Normal road use is fine but for off road purposes your probably going to have to make something and throw a jet kit in it. But as stated five stars works great for what I use it for.

Out of the box I could tell it was very cheap. One of the mounting studs was bent, but I was able to find a replacement. After several hours of installation (and lubing the motor with 2-cycle oil) I attempted to start it. It was very frustrating at first because it wouldn't start, but after redoing some electrical connections, I was finally able to start it.Sixteen miles later I am enjoying a sweet powered bike and it has more power now, because I installed the air filter correctly. ( it was getting suffocated previously) I highly recommend that you have some basic knowledge about two-strokes and mechanical experience before purchasing. You can cut the clutch cable and housing to a suitable length with a cheap cable cutter found on Amazon. The other long cables are kind-of annoying, but the extra length can be tied or zip-tied out of the way.The speedometer seems to be junk, and it keeps turning off or resetting.I would probably buy this again if I want to motorize another bike.I hope this review helps!

After installing the motor I found there was no spark. The test parameters, according to the instructions, for the magneto was 323 ohms. Mine tested at 343 ohms. My guess is that is not enough of a difference to cause no spark so I suspect the CDI is defective. As indicated in the ad on Amazon this kit is non-returnable but there is no way to request replacement of a defective part. Very disappointed. Be ready to replace defective parts at you own expense. Hope the engine is not defective. There is no option for choosing 0 stars.

My mechanic put this together and he did an amazing job.

Very hard to put together. The instructions are pointless because they do not help. And it didn’t even fit 2 seperate bikes I bought. They should give in a frame opening spec in the description

Thann you was just what I needed all in one.

It worked wonderful untile I ran it to hard for a long time it still works but some of the bolts became lose wonderful product

bolts will vibrate loose in less than 5 minutes no matter how much you tighten them and muffler won't stay attached