Another Newbie Needs Help

[catldavis]

I have an old Manco that I put a new HF Predator engine on. I have two problems, the drive drifts along its shaft and for the life of me I can't figure out how to make it stationary? It seems to have a place on the end of the shaft for a snap ring, but it still wants to drift side to side. The second issue is the clutch/drive. When I lift the rear tires off the ground by putting the kart on a stand, the clutch engages and the tire spins (here's a video link):

https://drive.google.com/file/d/0B0MgomsbUcPJelBFWG9ZNFVTNU0/view?usp=sharing

However, when I put it on the ground, the clutch engages and it just sits there (but you can smell the belt a little):

https://drive.google.com/file/d/0B0MgomsbUcPJUVJsUXFYX2NvOWs/view?usp=sharing

Is it the drive not engaging? I'm totally lost on this thing. Any help would be greatly appreciated.

 

[jandj]

From the video it looks like your belt is out of line to start with.
You're either gonna have to move the pulley on the motor out (and again,from the video it doesn't look like you have much room to do that) or move the other pulley in towards the motor.
It also would appear you need some type of spacer behind the pulley on the motor to keep it from "walking" in away from the nut end.

 

[catldavis]

Hi JandJ, thanks for the comment. When you say pulley on the motor, you mean the clutch? The driven is out of alignment as it had already "walked" away from the motor prior to me starting the video (trying to video with one hand and lift the cart with the other). I can't figure out how to keep it from walking. I was thinking to tap the end and use a bushing with a washer and bolt to keep it from walking away from the motor. However, even when it is in perfect alignment, it still won't pull the cart forward. I don't understand it unless the driven spring is too weak to engage the drive or the drive isn't engaging correctly. I'm by no means an expert on these things.

 

[jandj]

Yes, that's the pulley I mean.
If you're saying it was in line with the other pulley and has walked towards the motor then yes,you need something behind it to hold it in place so the belt's straight.
If you're saying it was closer to the motor but walked out,from the video it would seem the belt was more out of line than it is now which means it needs to move still farther out (or as I said before, the other pulley needs to move in.
As to the engagement issue, someone else will have to help with that as I'm not familiar with that type clutch, my kart has a Maxtorque clutch with teeth on it and a sprocket on the drive wheel.
My guess is it's not engaging fully.
Also, and again as I'm not familiar with that set up, if it's engaging the drive wheel
while it's in the air that usually means the idle is too high.

 

[catldavis]

I tried it again and the same result. It seems to engage if I push the cart and get it up in speed. However, once you slow down, it just spins unless you push it off again. Anybody else have any help?

 

[bob58o]

It seems to have a place on the end of the shaft for a snap ring, but it still wants to drift side to side.

Are you using the snap ring?

---------- Post added at 04:17 PM ---------- Previous post was at 03:55 PM ----------

A spacer and snap ring may keep the "Driven" pulley stationary. (the 30 series has a snap ring and large nut) Since the two pulleys are out of alignment, when at idle.... the angle of the belt is causing the "Driven" pulley on the jackshaft to turn as well, if it were straight... the belt would be loose and only the "Driver" would turn, not the belt.

When giving it gas, since the "Driven" is not secure... Instead of getting smaller and tighter on the belt, it just moves the whole unit along the jackshaft.


Like said before, Move "Driver" Pulley away from engine and/or move "Driven" Pulley closer to engine and secure it in place.

Just to make sure, how many teeth on Jackshaft sprocket and how many on Axle?

How high is your idle??? Put it below 2k to keep the belt from engaging

Make sure the "Driven" unit isn't on backwards and is at correct distance from crank shaft.
see instructions below


http://www.bmikarts.com/pdf/comet_40series.pdf

http://www.bmikarts.com/pdf/comet_30series.pdf

 

[catldavis]

Great information Bob58o! The complete setup is as it was from the factory (clutch, driven and belt). However, the engine is now a Predator and not the factory Tecumseh. Using the factory mounts, I don't have anymore length on the motor shaft to bring the clutch out away from the motor to be inline with the driven. I used a shim and longer bolt to get it out where it is located now.

I'll check the teeth on the sproket and jackshaft tomorrow.

The idle is as it came from the factory. The engine might have 30 minutes on it since it's been put on the kart (mostly idle time).

Thanks again and I'll return and report.

 

[bob58o]

i haven't personally used that torque converter. I'm only speculating from what i can see in the video and comparing to my 30 series. I only have used the TC that comes as one unit with the "Driven" already attached to a backplate mounted to engine.

I only ask about the "Driven" being backwards cause I remembered reading about it and it is not set up the way as seen in the instructions for the 40 series.

check this out.. not sure if it will help

http://www.diygokarts.com/vb/showthread.php?t=29648

 

[bob58o]

maybe a few lock collars would work better than the snap ring alone.
This looks like a setup with lock collars.

 

[bob58o]

This is what i was looking for.
I'm sure this pic will help much more than my speculation. Hopefully someone with a Manco will help out.

What about that part Manco #1494 in the pic???