upgrade

recently the chain tensioner on my grandsons hawg ty broke off & tangled in the front chain, bending the jackshaft. i got another jackplate from a member here & i slotted the holes that bolt to the engine. i can now move the jackplate back to adjust the front chain without using the tensioner at...

I have a 6.5 hp clone that i just recently installed a k&n style air filter, 90 main jet and 140 e tube. It would start and idle fine, but at wot it ran like a dog. Replaced the main jet with the old one and it runs fine again. Would not having a more high following header not give the engine...

So I'm looking at making a big purchase for my 212cc predator. I currently have a air filter, exhaust and a drilled jet. I was looking at getting 18lb springs, retainers to go along with them, 140 e-tube, mod 2 cam, a .615 Honda carb. I will also be getting a flywheel. The governor will be...

I went for a ride a few days ago. The road we were on is a dirt road with a 30 mph limit. It's all graded with little traffic. There were a couple small hills and the TAV took me up them with zero trouble. My motor is sputtering a little at peak rpm's, so I'll be checking that out this week...

I got this seat off of ebay a while ago, but I noticed when I got it that it lacked firmness in the pad and the seat base was very thin plywood. This is one of the "custom build" mini bike seats that are frequently advertised and sold on ebay. The first time I sat on it, my big fat :asshole...

I need to replace the carb on this baja heat I just picked up. Can anyone suggest a better carb for the stock engine (JF200?) on my 196cc baja heat? Thanks

Anybody know of a good (to read: cheap) source of big block clone alternator upgrade parts? I currently have an electric start 420cc with a 3 amp charging system and I would like to be able to run lights without running down the battery. The 18 amp upgrade parts, at the places I've looked, are...

Im trying to get together a complete list of parts that I want for my scrambler sometime in the future. what are my options as far as upgrading to a bigger jack shaft sprocket. without having to :grind: my own?

Currently running 18lb springs 1.3 stamped rocker, gx200 head gasket on a genuine gx160. I already have the billet flywheel and rod, I am now looking for more rpm. My thought is start with valve train before major hp stuff. That way the valvetrain should match the capabilities of the rotating...

Adding the engine plate to the bottom of the 6.5 clone

I've got an HS40 with a diaphram carb that is pretty beat (even though its rebuilt) and I'm thinking of buying a new one. I know that these diaphram carbs aren't that popular and troublesome so I was wondering what the experts would suggest to replace it with. I really don't want to upgrade...

((background)) Ok first off I'm new here, I've had my bike for about 24 hours lol. I got it from were I work, it was returned to the store because it didn't go fast. haha The store got full credit for it without having to ship it back. I offered the boss man 50$ and he was like okay but I'm...

I need help with the 6.5 honda motor i am making some modifications to, what i have bought so far from OldMiniBikes is the super x cam, flat top piston, 0.010 over rod, 18 lb. springs, 8 degree key, all witch i dont have a problem with, my concern is that if i buy the 1.3:1 rocker arm is there...

Did this as a father --son project. Highly recommend it. My son was really in to it. He did almost the whole thing by himself---and he is 8. I just tightened it up a little more and explained the directions.

I saw a Kohler 6.5hp engine for 185.00brand new--shipped to my house. Cast iron cyl. liners. Wouldn't this be a way better engine for only $55 more than the Harbor freight engine? So what other engines fit the ProMod kit without any mods/drilling?

My son is loving his "Dirt Bug" from TSC but I know the day will come when the tiny Lifan engine just isn't enough. Is the 6.5 upgrade the only option? It just seems WAY overpowered for a skinny 11 year old. I have seen the video's and I don't need/want him popping wheelies and doing...

Hello All, I'm new to the OldMiniBikes forum and I just recently purchased a new Doodlebug DB30 and was wondering what all I need to change it from the stock 2.8 to a ProPower 6.5 (besides the 6.5). I understand I need to change the mount but will the engine sprocket and Throttle fit etc.? Thanks...

I just replaced the old dying 5HP Briggs on my son's 1972 Manco Thunderbird with a HP 6.5 Clone. it runs great. Now I want to use the original frame mount tank, what size fuel line do I need to connect the manco tank to the HF engine? Also, I would love to add a better brake, scrub brakes are...

A couple of questions.. Does the stock chain cover fit the HF engine? Is the shaft size different, my guess is yes. Where can I get a throttle linkage kit, assuming I cannot scavange parts off the old engine. I know about the complete engine replacement kit, but I don't want the whole...

I have been getting conflicting information. Some are saying when you remove the governor it only gives you 5200-5500 rpm and you do not need to put on the 18 lb valve springs. Others are saying you do. What is the correct answer? And Why? Thanks Randy