Author Topic: Front and rear main bearings  (Read 1416 times)

Offline Testarossa

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Front and rear main bearings
« on: November 06, 2017, 04:19:17 PM »
'74 850T

So . . .  the front and rear bearings are integral with their flanges?  Or can they be pressed out of the flanges and replaced that way?

Looking at the parts list at Harpers, I don't see separate part numbers for the bearings distinct from the flanges -- just the bearing-with-flange parts, that is front 12011900 (with oversize options) for $172, and rear 12011400 (with oversize options) for about $300.

Is there a cheaper way (Guzzi content) to replace those bearings? Pete Roper's instructions don't mention one.

http://www.thisoldtractor.com/guzzitech.dk/pdf/08_pete-roper-bigblock-guzzi-engine-strip.pdf
70 Triumph TR6R, 74 850T, 74 Yamaha TA125, 89 Mille GT, 99 F650, 2013 Yamaha XT250; 1974 MGB
Gone: 59 Piper Comanche 250, 69 Harley/Aermacchi 350SS, 71 Honda CB500/4, 74 Laverda 750 SF2, 91 Suzuki VX800, 50cc two-stroke scoot, 83 XR350R

Offline Antietam Classic Cycle

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Re: Front and rear main bearings
« Reply #1 on: November 06, 2017, 04:26:49 PM »
Nope, sold as a flange complete with bearing. MG Cycle is much less expensive.
Front main: $90-$95 for filter engines, $104-$108 for non-filter engines
1st under rear main: $153.57: http://www.mgcycle.com/index.php?main_page=product_info&cPath=68_126&products_id=189
Charlie

Offline Testarossa

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Re: Front and rear main bearings
« Reply #2 on: November 06, 2017, 06:09:32 PM »
Thanks, Charlie!
70 Triumph TR6R, 74 850T, 74 Yamaha TA125, 89 Mille GT, 99 F650, 2013 Yamaha XT250; 1974 MGB
Gone: 59 Piper Comanche 250, 69 Harley/Aermacchi 350SS, 71 Honda CB500/4, 74 Laverda 750 SF2, 91 Suzuki VX800, 50cc two-stroke scoot, 83 XR350R

Online Huzo

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Re: Front and rear main bearings
« Reply #3 on: November 06, 2017, 06:15:06 PM »
Harper's has an apostrophe.... :rolleyes:

Offline Testarossa

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Re: Front and rear main bearings
« Reply #4 on: November 06, 2017, 06:22:41 PM »
 :violent1:
70 Triumph TR6R, 74 850T, 74 Yamaha TA125, 89 Mille GT, 99 F650, 2013 Yamaha XT250; 1974 MGB
Gone: 59 Piper Comanche 250, 69 Harley/Aermacchi 350SS, 71 Honda CB500/4, 74 Laverda 750 SF2, 91 Suzuki VX800, 50cc two-stroke scoot, 83 XR350R

Online Huzo

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Re: Front and rear main bearings
« Reply #5 on: November 06, 2017, 06:47:51 PM »

Offline Testarossa

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Re: Front and rear main bearings
« Reply #6 on: November 21, 2017, 12:38:48 PM »
Ordered all the bottom-end stuff today. Crank came back with everything ground to one undersize.

Sludge trap was about 1/4 full with mostly rubbery stuff off the original chain tensioner.




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Next step is to soda-blast the crankcase and gearbox.
70 Triumph TR6R, 74 850T, 74 Yamaha TA125, 89 Mille GT, 99 F650, 2013 Yamaha XT250; 1974 MGB
Gone: 59 Piper Comanche 250, 69 Harley/Aermacchi 350SS, 71 Honda CB500/4, 74 Laverda 750 SF2, 91 Suzuki VX800, 50cc two-stroke scoot, 83 XR350R

Offline Curtis Harper

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Re: Front and rear main bearings
« Reply #7 on: November 21, 2017, 02:06:59 PM »
Harper's may be a bit more money, but Harper's has OEM parts. Not something that is questionable as to it's manufacture.......
More Moto Guzzi parts than anywhere.
www.harpermoto.com
1-816-697-3411
curtis@harpermotocom

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