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Old 08-17-2019, 04:25 PM
7sluck 7sluck is offline
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Default Options for replacement drum/sprocket

I was wondering if there was a good alternate option that anybody else has had luck with on replacing the sprocket/drum on a Manco model 104D-29 GRASSHOPPER. I didn't want to go back to the two-in-one, sprocket/drum, but rather two separate parts to avoid the current situation of a broken drum. I was thinking about drilling and bolting the two together with some spacers even, but wanted to consult the more experienced crowd before I go and start modifying this, as this field is not my specialty.
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Old 08-17-2019, 10:25 PM
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Hellion Hellion is offline
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This is a one-wheel drive kart, yes?

The combination sprocket/drum is tried and true. One of my karts (live axle) has
that setup--they are bolted together.

Anything is possible, but more photos of the rear end would help tremendously.
I'm sure Dr. McKutzy would agree...
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Old 08-18-2019, 07:02 AM
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Hes right not much more solid set up than that for a yard kart. I have the manual disc on one of our karts the are worse. Bolting it with 4 , 5/16 bolts would be good.
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Old 08-18-2019, 07:47 AM
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Quote:
Originally Posted by Hellion View Post
This is a one-wheel drive kart, yes?
No it's a tubed live axle in fact..


I wonder how you managed to brake the drum to be honest,
since it's the last thing I can see failing on a setup like that..
Nevermind
Now IIRC the drum is riveted to the sprocket not welded,
so you can drill out the rivets and rerivet a new drum if you want to.
(only a tad more difficult than un- and rebolting a drum)
And if I'm not mistaking that's been done since a bolt head doesn't clear the axle tube sufficiently but I might be misremembering... *shrugs*

The replacement has indeed a bolt on sprocket (and a keyed drum)
https://www.gokartsupply.com/sprocket.htm
scroll down to part 12087G
IDK if that fits (for reasons above) but usually gokartsupply is trustworthy enough to give it a try


'sid

PS do NOT use a spacer though.. the sprocket acts as a guide for the brake band.. and if that gets stuck between the drum and the sprocket or slipps off the drum you have either a non moving or a non braking kart (both is annoying )
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Old 08-18-2019, 11:10 AM
mckutzy mckutzy is online now
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Quote:
Originally Posted by Hellion View Post
This is a one-wheel drive kart, yes?

The combination sprocket/drum is tried and true. One of my karts (live axle) has
that setup--they are bolted together.

Anything is possible, but more photos of the rear end would help tremendously.
I'm sure Dr. McKutzy would agree...
I concure my good friend... more pics please...
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Old 08-19-2019, 12:18 PM
7sluck 7sluck is offline
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Default Brake-no-brakey

I will do a little cleanup of the drive case tonight and take some more pictures.

As far as how it happened, I'm not for sure. I fired it up for the young'uns one day and I started to hear some metal-on-metal clanking and rubbing. Then I found the drum had come apart from the sprocket.

I was going to put spacers in-between them to properly align the brake pad with the drum portion. I didn't see any clearance issue right off the bat, but when I clean it up, I'll take a better look and post those pictures later.
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Old 08-20-2019, 08:29 PM
7sluck 7sluck is offline
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Default A few more pics

So, I have not managed to get it torn apart yet. I've got too many irons in the fire right now, but it's next on the list. I'm assuming that I should probably get some new bearings for the kart since I'm going to be tearing it apart (I'm assuming there are bearings on the drive shaft)?
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Old 08-21-2019, 12:28 AM
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You can certainly get new bearings, or go hog wild and replace everything that's a 'wear item', and that's a good idea but you can also service the sealed bearings (if they just feel or sound rough but are still in spec). Pry open the bearing seal with a dental pick and repack it with a good grease.


Otherwise, buy new. 5/8" ID x 1-3/8" OD bearings are cheap.


Now the reason I thought your kart was 1-wheel-drive was the fact both rear wheels appear to have wheel bearings, but there is an axle too....Manco model 104: http://kartingdistributors.com/pdfs/...ed20020909.pdf


It certainly is an interesting failure--the sprocket and drum were sheared in twain (two).
Could be welded back together if you didn't want to fork over $42.95.
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