Building monster go kart from scratch

[theo]

Looks like you are going to get bump steer with your a arms mounted like that. Cycle one side of the suspension and see if you have any rotation on your steering shaft. Frame looks great.

 

[hotrodchevy83]

lol i have a 15 48 flat bottom with a 640cc jetski motor in it

 

[hotrodchevy83]

whatcha mean bump steer with a arms? if ya refering tires rubbing have about 3 inch of clearance. what ya mean rotation on steering shaft? it turns 1.5 turns left or right from center shortened a rack and pinion off a mitsubitshi mirage thanks on the frame comment hope it dont bend lol welded with 7018 3/32 next time be wire welded lol

 

[theo]

What i mean is, what happens when you lift up one side of your suspension. Is there a toe change.

 

[Doc Sprocket]

To clarify- Have someone hole the steering wheel dead straight, and lift a front tire all the way to the top of it's travel- does the tire stay straight all the way up, or does it steer as it goes? Please note that this test is much easier with the spring removed.

 

[hotrodchevy83]

it has a rack and pinion that has ball joints inside the rack and pinion so the shaft length stays the same

 

[fowler]

just do the test and u will see

vidio it and post it here we will tell u

 

[hotrodchevy83]

so what is the limit?

 

[fowler]

limit for bump steer?

0 degrees

it depends on road 0 is the limit
off road u are allowed some but u will notice it

 

[theo]

it has a rack and pinion that has ball joints inside the rack and pinion so the shaft length stays the same

You are right the shaft size stays the same, but if the a arms and the tie rod are not swinging in the same arc the tie rod will push the spindle either out or in, as the a arms go up and down, changing the toe.

You should be able to get most of the bump steer out with single a arms, because you are limited to travel.

 

[hotrodchevy83]

well just wondering if the motor i am putting in there is going to be enough and its shaft drive im not sure how to hook it up to a sprocket

 

[bighead]

I have an old angled gear box out of an old 1985 ATC250es Big Red three wheeler. Not sure if it would work. But just shooting ideas.

 

[hotrodchevy83]

well i have 2 sprockets how can i hook them up?

 

[fowler]

u will get an adaptor made up and put the engine faceing sideways

also u are useing proper sprockes aint u

keyed sprokets are no good

how many splines are the shaft

 

[hotrodchevy83]

the shaft to the final drive is 3/4 of an inch exactly so i had a keyway cut in it and going to use it with some high speed bearings. i am running the sprockets i had just to see if it would work its two 40 chain sprocket 10 tooth to 54 tooth what ya think?

 

[fowler]

noooooo

number 60 chain
iv seen the result of a chain snap in low speed situations and if it can dent steel tube then your head is no match


u need to find the specs for this bike
hp and gear ratios

id say a 70 tooth at least
find the origonal tooth count and add a few

do u have pics of this engine?

 

[hotrodchevy83]

its suzuki gs850 1981 model it got 2 40 chains double sprockets 10 driver to 54 driven

 

[fowler]

on the ogigonal bike?

well change it to a single 60 less things to go wrong

 

[hotrodchevy83]

i had a setup with 2 sprockets already so just gonna run with it consist of two number 40 chains the driver is 3/4 keyed shaft

 

[hotrodchevy83]

what ya think