vertical shaft kart build

[bighead]

Why was the motor tore apart?

 

[Bluethunder3320]

Why was the motor tore apart?

my friend said it had low compression, and he tried to see whats wrong, and saw everything fine.

however since he took it apart i figured ill do a total tear down and rebuild.

i am going to get new rings, head gasket, crank case gasket, and i need to get an air filter as well.

toystory:
its 2003 murray select 40" mower. tecumseh 5 speed transaxle. differential. 13.5hp vertical briggs.

i still need to get the blower housing from my friend so i dont know the model and code stuff of the engine.

 

[Bluethunder3320]

old pulley:

drilled out the spot welds.

took a pulley off the blade deck and cut out the center of it (wasnt 5/8 keyed...)

then welded the center of the old pulley onto the smaller blade pulley

EDIT: sorry the dates on the pictures are all way off. i took them today.

 

[Bluethunder3320]

 

[dan]

howed u center that hub on the pulley?

 

[Cam]

I think it was the ol case of the eye'crometer mate

 

[AnderBlast]

nice build man looks good i always wanted to build an awl lawn mower

 

[r97]

looks pretty good so far.

maybe support the tranny area a bit more? why out the engine so far away from the tranny? good to see your using a clamp on the drill press now. looks like a nice place to work, heated(?), and you don't have to move the tools around.

do those wheels have bearings or bushings? also it is stronger if you don't have the ends of the tubes open.

 

[Bluethunder3320]

looks pretty good so far.

maybe support the tranny area a bit more? why out the engine so far away from the tranny? good to see your using a clamp on the drill press now. looks like a nice place to work, heated(?), and you don't have to move the tools around.

do those wheels have bearings or bushings? also it is stronger if you don't have the ends of the tubes open.

yeah im going to try to close off all the tubes. there are more threaded holes towards the front of the tranny and im going to run some tube down to it.

yeah heated its my basement LOL

the engine is spaced that way because im using the belt off the blade deck. the drive belt was missing when i got the tractor so thats what i got.

bushings in the wheels, its going to be gered for 20 MPH high gear.

 

[Doc Sprocket]

What are your plans for the brakes? I know firsthand that the little disc and caliper on the transaxle are terrible. What have you got planned?

 

[Bluethunder3320]

i was just planning on using that stock brake. MAYBE get a new rotor, and most likely different pads.

 

[Doc Sprocket]

Ooh. Don't hold your hopes up. Try it out, but expect an upgrade.

 

[Bluethunder3320]

the thing is, upgrade to what?

IDEA:
what if i put a brake rotor (i have one from a electric dirt bike) welded it to the original one, and mounted a caliper?

 

[Doc Sprocket]

You could try that. You could also try adding one to the input shaft, which may require extension. You could add a brake at each wheel.

The problem with braking an open differential at the pinion is that it can exhibit some very odd behavior in varying traction conditions. On the tractor at low speed and weak brakes, not much is noticeable. At higher speeds, and with enough clamping force to lock 'em up on loose surfaces, you can actually end up with one wheel still rolling forward, while the other one actually spins backward! Freaky as it is, I had this happen to me a couple times while doing the shakedown runs on my kids' kart, which uses a differential from an old lawn tractor. It was really weird, braking hard and throwing gravel forward! This occurred on loose gravel, locking the brakes hard at full bore.

 

[redsox985]

That would surely be interesting to be spitting gravel while mashing on the BRAKE!

 

[Bluethunder3320]

You could try that. You could also try adding one to the input shaft, which may require extension. You could add a brake at each wheel.

The problem with braking an open differential at the pinion is that it can exhibit some very odd behavior in varying traction conditions. On the tractor at low speed and weak brakes, not much is noticeable. At higher speeds, and with enough clamping force to lock 'em up on loose surfaces, you can actually end up with one wheel still rolling forward, while the other one actually spins backward! Freaky as it is, I had this happen to me a couple times while doing the shakedown runs on my kids' kart, which uses a differential from an old lawn tractor. It was really weird, braking hard and throwing gravel forward! This occurred on loose gravel, locking the brakes hard at full bore.

i got alot to mess with brakes when i used to have r/c cars.

once with my 4.6cc buggy it had all wheel drive with a center differential, and the rear brake broke.

so in turn the front wheels locked up and it did flips forward! it was hilarious to see.

 

[Bluethunder3320]

Okay well the battery and starter are both good. I just jumped the thing with jumper cables and its working. However, the plastic insulator on the starter is broke. Im having trouble finding a new one.

I just zip tied the positive wire away from the negative starter body as a temporary fix.

 

[Bluethunder3320]

Here are my brake options....... The small one is stock.

 

[Doc Sprocket]

Okay- now what about the caliper?

 

[redsox985]

Are they the same thickness? Does the caliper suck either way?