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Question 65 Hillbilly 80 cc

  • chuckw
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65 Hillbilly 80 cc was created by chuckw

Not sure anyone here has experience with this bike, but I just found one that is solid and pretty complete.  Had it running, until it blew out the LH crank seal, which is very dry and stiff.  Have another coming.  Bike has good compression. Same engine is used in the K10,K11 and K15 from what I can find.Not sure anyone here has experience with this bike, but I just found one that is solid and pretty complete.  Had it running, until it blew out the LH crank seal, which is very dry and stiff.  Have another coming.  Bike has good compression. Same engine is used in the K10,K11 and K15 from what I can find.

While messing with the magneto/flywheel and crank seal, I noticed that the crank moves side to side in the main bearings; more than 1/8".  This seems pretty strange to me, I've not seen one that didn't have the crank pressed into the bearings, or at least shimmed to remain centered.

Any thoughts or suggestions from a Suzuki guy on this forum?

Thanks,  

 
69 DT1, 75 DT400 (2), 86 XT600, 78 Honda XR50, several 70's/80's MX bikes, 2021 Husky FE350
Last edit: 13 Jan 2022 11:19 by chuckw. Reason: correct text
13 Jan 2022 11:17 #1

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Replied by RT325 on topic 65 Hillbilly 80 cc

Parts pic isn't very clear & a bit confusing to look at, but i guess the RH crank nut holds it over. Can you view the crank nut through the filler hole in the clutch cover. If its tight then not sure. Are the bearings loose in the case on the right side & crank a sliding fit in the left so there's your in & out play of clearance from left crank web to the left bearing. If the crank nut is tight i'd just leave it & 'ride on' as possibly been like it forever.--with a new left seal of course. earliest i could find was "68 similar.
www.partzilla.com/catalog/suzuki/motorcy...10/piston-crankshaft
Last edit: 14 Jan 2022 01:24 by RT325.
14 Jan 2022 01:23 #2

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Replied by MarkT on topic 65 Hillbilly 80 cc

I've never seen a crank on a bike held only by press fit inside a bearing...  usually a nut/gear sandwiches a bearing like RT325 said... 

 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
14 Jan 2022 06:02 #3

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Replied by chuckw on topic 65 Hillbilly 80 cc

I think you guys have it right, the primary gear nut on the clutch side should hold it in place.  There is not an access hole, so I'll need to pull the side cover off to check it.  Understand the press fit bearings to crank don't typically hold it in place, but I've not seen a crank so loose in the bearings that it moved back and forth easily.  

I have seals coming, both sides (same seal).  Once they arrive I'll get the side cover off and see what it looks like and update this thread.

Thanks for the responses, 
69 DT1, 75 DT400 (2), 86 XT600, 78 Honda XR50, several 70's/80's MX bikes, 2021 Husky FE350
14 Jan 2022 09:55 #4

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Replied by nhsteve on topic 65 Hillbilly 80 cc

I had a K10 for awhile. Very good original shape when I got it, so not much needed other than tires and tubes (age cracks), and a few small things. I don't recall setting the timing so cannot speak to how the crank moves, but in and out play does seem odd. I would like to hear how it all ends up so please post back if you think of it.

I wound up teaching our son to ride on it. He wanted to ride it to high school, about 22 miles one way on a road that had some fast 50mph stretches. Did not like that idea, traded it to a man for a '73 RD250 in decent condition. Once squared away that at least could hold it's own.
14 Jan 2022 11:39 #5

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Replied by chuckw on topic 65 Hillbilly 80 cc

So I found time to pull the clutch cover off between other projects. It does not appear that the primary gear nut is loose; it is still restrained by the bent over keeper. Crank movement is between 1/16 and 1/8 on this side also. It does not seem that the bearings are moving in the case; the crank is sliding in the bearings. Waiting for the replacement seals to arrive, but not sure what to try next with the movement. Could possibly add some shims under the primary gear to hold it to the RH side?

Interested in any suggestions and ideas!
69 DT1, 75 DT400 (2), 86 XT600, 78 Honda XR50, several 70's/80's MX bikes, 2021 Husky FE350
17 Jan 2022 16:34 #6

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Replied by Scootern29 on topic 65 Hillbilly 80 cc

If you happen to be on Facebook, contact Joe Broussard. He is an Early Suzuki guru. We call him Suzuki Joe. I've known him about 30 years, knows his stuff.
Question authority, think for yourself!
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18 Jan 2022 17:37 #7

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