New build, Racer.

[Kali4nication]

Hey everybody,
Just found this website looking for a new motor, and I thought I would post my bike. Please let me know what you think. It's a cheap 68.5cc engine kit bought off ebay, and an old diamondback frame. It has road tires and a speedo. Took her out for the first time with a speedo earlier today. Top speed hit 45mph before the road ended. Muhahahaha. I'm only around 200mi on the motor, so I don't want to beat on it. I would guess 48-52mph is top speed. Stay posted for the results....





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[Kali4nication]

Welcome to the forum, and don't take this the wrong way, but ...

Call me unconvinced about your speed estimate (unless you were going downhill). It takes quite a lot more than a stock kit and sprocket to do 45MPH with an HT motor. Still, I'm guessing those are 700c wheels, which would give you a bit more top end than a 26"er.

In the top pictures, I see that the stock air cleaner tubes are pointing up. Those should be down, like in the last picture, to keep road trash out. The other thing I see is that the chain is way too loose. Snug that up before it jumps off and throws you down like a rag doll. You might invest in a fuel filter, because the cheapy plastic one on the inside of the petcock is junk.

Apart from those few things - nice clean build. I've got a build going on a similar bike, with those flat bars - do you get a lot of vibration through those? Mine seem to be pretty harsh.

My speedometer may be off. The directions say it should be exactly 5mm from the sensor. I will test it by riding along side my roommate's car over the weekend. I will also swap the intake as suggested. I flipped it over thinking the air would be cooler and more direct from the top, but I did not take in account the dirt. Also, the chain is very snug imo. Should it be so tight that I would put muscle into it? How would I test the tension? I will also be replacing the spark plug, and adding another fuel filter. What type of store would carry all of these supplies? I was thinking any auto parts store, but idk.

Thanks for the information and prompt response. All feedback is welcome and appreciated.

 

[Kali4nication]

I can't think of any other way of getting a accurate reading. A radar gun would be perfect! I'm sure there is a math equation that would tell me based on two points. I know some law enforcement use that method when they can't afford radar guns. They paint 2 white lines on the road, and time how long its takes to cross them(I'm guessing here). I would assume the lines are measured perfectly, and the person has a stop watch.

I will go over the chain and get back with you. I didn't try rolling the bike:/
Also, I cleaned, and returned the air filter facing down. Heading to the store for plug and filter. Will post pics after.

Thanks again.

 

[Kali4nication]

Good idea. I know android offers one free, hopefully windows will too