ratio

Ok so I wanted to make a thread on the benefits of each drive system and the disadvantages of both to help anyone in need of some information on this topic. Centrifugal clutches have springs wrapped around the clutch shoes. When the engine rpm is raised the centrifugal force makes thes waits...

Hi everyone, I'm looking at building my first mini bike and I'm not sure what sprocket size to put on and what ratio I should go for. It's going to be a lightweight fat tire bike similar to the one jeep2003 built. I'll be using on muddy/ hilly terrain. This is what I'm thinking so far...

Hey all, been a while since I've been on here. Winter time in the great Northwest and I had my Ruttman stored away. With good weather coming up, I've decided to "soup it up" a little. I already ordered parts, but I have a question. Will a gear ratio of 3.5 to 1 work? I ordered a 17 tooth...

In the process of rebuilding my MTD/Columbia dual suspension mini bike and I was wondering if anyone who has a factory unaltered model what would the tooth count be on the jackshaft drive sprocket? I have the factory rear 3 hole sprocket on the rear wheel. Thanks! I'll get some pics posted of...

not sure what a good gear ratio to shoot for is. I have a 6 horse with a 10 tooth clutch and 60 tooth sprocket and I will be adding a jackshaft but do I want to stay with 10 tooth spockets (final drive 6.00)on the jackshaft or like a 13 and 17 (4.59 final drive)...I'm not looking to set land...

I see a lot of you fells running a 1.3 ratio rocker on the intake side only. Why is that? Why not both?

I have a doodlebug predator 212 hemi. With gov still on 3 stage loop exhaust Ruixing carb .035 jet new imulsion tube K and n air adapter I have 15x6x6 rear tires 13t max torque clutch My gear ratio is about 5.5 to 1 Will this harm my clutch ? what is the range of...

Guys, I apologize for asking something I'm certain has been asked before. I swear on my only child's life that I did a search, and there is a lot of info our there on this, but I was having a hard time finding what I'm after. I need advice on what gearing ratio I should shoot for wit my tav...

What is the ratio of fuel to oil that this engine recomends, I know they are rare so I wanna be proper with it. It came on a desert fox I just bought.

I just want to hear some experiences with high gear ratio and the other factors that go into play along with them such as: Weight of mini-bike (or go kart) and operator combined. Gear ratio. Size of tires. estimated top speed estimated time to get to top speed. `My personal experienced...

i was going to post in tech section but i think all engines and tanks are different. Parts: gx390 carburetor and 35lph mikuni fuel pump. 1/4"inch "T" fitting and line. So i've been working on my engine for many months trying to pinpoint why the engine either wont start...

Hi, I have started making a frame for a minibike. The rear wheel is a 15" diameter (395mm), has a 70 tooth sprocket on it #428 pitch and size chain. The engine I have is a 3hp briggs. What gear ratio would I need for hill climbing and going slower for the kids? I can get a 12...

I have searched the forum with no luck so far. im running a predator 212 hemi head with boxstock bored carb mod 1 cam 18# springs and i bought a jackshaft but was wonder ing about the ratio i have a 12 tooth clutch and 54 rear sprocket the jack shaft is 13 and 15. One way i get a ratio close to...

Running a harbor frieght 6.5 stock. I have a clutch with 10 teeth rear wheel is 14" outside. I have a 26 tooth sprocket came on rim . what will that run like? I have 3 more sprockets but all different mounting holes. They are 42, 54, 60 teeth. If I'm going to adapt one on, which is the first one...

I know that the tolerances are all over the place for these motors so I am measuring piston deck height(amount piston in hole) as well as gasket thickness and head volume to determine compression ratio. My question is what is the average cutoff point where 93 octane can no longer be used and...

I have a 212cc non hemi and I want to know how much hp im making. And once I know how much hp im making I need suggestions on 1/8 gear ratio (clutch to sprocket) Currently have 12t clutch 70t sprocket Dyno cams - mod2 18lbs springs (26lbs on the way) E tube and .32 jet 2 degree timing key...

Hello. I recently bought an old (1968) 2 hp flat head Briggs on a local swap meet. It seems to be in good shape except for the gas tank, which has seen better days. Now I'd like to build something fun with it and I thought of a minibike. I don't know if the 2hp is strong enough though, what...

Billet Aluminum Hemi Rockers I hope I'm not violating any rules, but if any of you would like more info about acquiring a set of these please email me at brad@bradhillperformance.com Billet 7075 1.2 ratio rockers for the Hemi head.

I was just playing around with one of the top speed calculators and I bought a torque converter kit for my 212 predator I put in a go kart which is strictly got off road use, and the kit came with a 10 tooth and a 12 tooth sprocket, my axle has a 60 tooth on it and I went with the 10 tooth for...

gx440 block 69mm stroke 4.450 rod flat top 92mm piston that's what I got so far.. I need ... cam flywheel head rockers nr racing sells a gx390 head 40 mm intake ? I'm also looking at raceseng 1.8 fly wheel and the 356 cam from nr racing still clueless about rocker...