I’m putting a first generation Briggs animal in a Mini bike fat rear tire 13 x 6 x 6 not sure if I should run a torque converter or a regular clutch motor with a comet torque converter already set up has an 11 tooth sprocket in front. The minibike came with a 40 tooth in the rear, not sure if I need a 35 or 40 chain
Animal in mini bike
- Thread starter samstheman
- Start date
Torque converters generaly are geat for having off the line torque then it slowly upshifts to give you more top end. The centrifugal is simpler and lighter and may allow some extra rpms at top end but it would need much lower gearing to acheve the same takeoff as the torque converter and unless that motor is an extreme build the torque converter will preform better.
On the torque converter the rear clutch is just bolted on. Take the bolt off and slide the driven clutch off to access the sprocket, its an easy swap.
There are preformance mods for the torque converter, look them up if you want to get the most out of it.
Depending on the wheels you have a 40 tooth rear sprocket may be a bit high on the gearing. Most bikes are closer to a 50 tooth.
On the torque converter the rear clutch is just bolted on. Take the bolt off and slide the driven clutch off to access the sprocket, its an easy swap.
There are preformance mods for the torque converter, look them up if you want to get the most out of it.
Depending on the wheels you have a 40 tooth rear sprocket may be a bit high on the gearing. Most bikes are closer to a 50 tooth.
Ok so this is where I’m at comet TC. Brigs animal rear tire diameter is 12.5. Rear sprocket is 54 front sprocket is 12 but I think I need 10 the 40 chain makes front sprocket way bigger than 12 front in 35 now I see size difference when I received new sprocket I also have a 40 rear that might go with this 12. Anyways, any helpful tips and yes, the 40 chain is big..
still trying to sort out gearing, but also need to get exhaust in any suggestions
still trying to sort out gearing, but also need to get exhaust in any suggestions
Attachments
The attached pics show a Caper Cycle That [years ago] I installed an Animal engine. Has not been started up in a very long time. The compression was bumped to about 11 to 1. That was a lot of hassle as I remember. The cam is stock but both intake and exhaust rockers have been altered to give a better ratio: more lift and better cam timing. The velocity stack was turned from solid and the curved intake is also hand made...I had way too much time on my hands. By he way: Note the hose that goes from the rocker box to the intake, The stock engine has that so I plumbed it back into the suction of the aftermarket carb. I am 100% sure that it is necessary that the hose from the rocker box CANNOT be simply vented to the atmosphere. The ONLY way that the valves and valve gear can get lubed is by way of oil mist from the crankcase. There is no 'oil pump'! In my humble opinion it would be a mistake to defeat the added vacuum that the designers supplied. I used a regular centrifical clutch and it is problem starting the engine. I always had to put the front wheel against a tree before pulling the start rope. As the engine would nut idle below the 'lock-up' RPM of the clutch the little bike would ether stall of take off for the moon. I recall the first time I started it. With malice and aforethought it attacked my....I turned it loose to crash without me nearby. But with the proper starting procedure it is a riot to ride. Quite fast.
Attachments
Sam. You asked about an exhaust pipe for the Animal; here is a pic of what I made years ago. The mini has been sitting in the bike shed and is awfully dirty, I have no excuse for that. The pipe shown is a 'megaphone' with a aluminum heat shield. The cone was made by turning a piece of hardwood to a cone shape and working the sheet metal around it. That was a lot easier than it sounds. IT IS LOUD! The other pic shows the regular clutch and jack-shaft and abbreviated aluminum chain guard. Note that there is a 'brace' provided under the pipe and goes back to the engine.....without a brace the weight and shake of the assembly would surely tear the bolts out if the aluminum head casting. A friend of mine that survived riding it said I gotta will it to him.
