|
|
Post by dashrite on Aug 27, 2016 11:30:52 GMT -5
Well I was going to sell this new motor I bought and donate 10% to the forum, but now I have to use it to get around. It has a 10mm wrist pin so I can not put my 70cc bbk on it. My current motor has a bit of a grinding noise in the gearbox. I just put a new bbk on it and I didn't even get to run it. When I was tuning it I started hearing a grind noise and it's either a bearing going up or something. Instead of just fixing that I have decided to do what I have always wanted to do and crack the case and throw in a better crankshaft and redo all the bearings and what have you. I have never done anything like this before in my life. Luckily my uncle works on motorcycles and has all the tools I need to rebuild the old motor. Suggestions on what to buy and which bearings to use and what not will be helpful. It is a minarelli chinese clone. 2004 Vento Triton. Same one 90gtvert has. I am just gonna man up and do this thing right. I will learn a lot from this experience. Might even consider turning this into a liquid cooled. At the moment I am not sure. Today I will have the new 50cc motor swapped out. The easy part. At least I will be able to still ride around. Here is the video I posted in the 2t troubleshoot section earlier today where you can see the wheel moving in and out and can hear the slight grind. youtu.be/Ev_CajKkaSY |
|
|
|
Post by ryan_ott on Aug 27, 2016 23:38:22 GMT -5
You will enjoy building a motor up. I find it soothing. Ok when things go well. Brent has all the bearings listed in the tech area for you. Don't skimp on quality bearings. The whole set pieced together is only $20-30 for quality stuff. Lc is nice but there are additional costs involved ( radiator, pump, gauge hoses)but it's worth it in the long run. What is your budget and what kind of rpm do you want the motor to run. I had a relative simple motor ( malossi cast LC, pwk 21, stage6 pro rep. Plus the other normal stuff) and I could get low to mid 60 at a mild 11,000 rpm. So not all 70's need to scream.
|
|
|
|
Post by ryan_ott on Aug 28, 2016 9:34:10 GMT -5
|
|
|
|
Post by dashrite on Aug 29, 2016 16:56:19 GMT -5
Yeah thanks for posting that. I did end up finding that thread about the bearings. Niw i am getting a parts list together. Still on the fence about the lc. I normally order from scoot tuning.ca. have always had good service from them and they have a nice selection. I am searching for mire places to buy from when it comes to performance parts. Most places are in Europe.
|
|
|
|
Post by bluegoatwoods on Aug 30, 2016 5:41:05 GMT -5
I was in a similar spot once. I needed to rebuild a three cylinder motorcycle engine. I didn't really know what I was doing, but I went ahead and did it anyway. With the help of a Yamaha shop manual.
It went well. I got a lot more miles out of that bike and so did the guy I sold it to. And it was a useful learning experience.
But I'm curious; is it even possible to convert an engine designed for air cooling to liquid cooling? There can't possibly be a water jacket.
|
|
|
|
Post by dashrite on Aug 30, 2016 14:50:07 GMT -5
The cylinder itself has a watercooled jacket around it instead of ac cooling fins. There are some members on here that have done the conversion. Im doung alit of research before i start buying anything. Like where and how to mount the radiator and such. If all else fails i still have an ac 70cc jug to throw on. No matter what i will be putting a new crank and all new bearings in.
|
|
|
|
Post by 90GTVert on Aug 30, 2016 14:50:55 GMT -5
But I'm curious; is it even possible to convert an engine designed for air cooling to liquid cooling? There can't possibly be a water jacket. Most of the time people converting these small air cooled scooter engines to liquid cooling are buying a new cylinder kit. The new cylinder and head will be setup for liquid cooling so they then just need to work out the radiator(s) and pump. There have been people that have surrounded an air cooled cylinder in order to convert to liquid cooling. |
|
|
|
Post by bluegoatwoods on Aug 30, 2016 20:23:36 GMT -5
The cylinder itself has a watercooled jacket around it instead of ac cooling fins. There are some members on here that have done the conversion. Im doung alit of research before i start buying anything. Like where and how to mount the radiator and such. If all else fails i still have an ac 70cc jug to throw on. No matter what i will be putting a new crank and all new bearings in. Pretty versatile little engines and aftermarket parts, huh? That's kinda cool. |
|
|
|
Post by dashrite on Aug 31, 2016 20:08:28 GMT -5
Could someone use thin copper tubing to go in between each fin? Dont know how much heat transfer you would get. Probably wouldnt work, but its an idea for a poor mans lc engine.
|
|
|
|
Post by 90GTVert on Sept 1, 2016 7:14:44 GMT -5
I guess that would work to some degree.  You'd have the greatest surface area for heat transfer trying to encase the cylinder in liquid though. |
|
You'd have the greatest surface area for heat transfer trying to encase the cylinder in liquid though.