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Motorcycle Repair/GT750 Crank seals


I have a Kettle that runs great but burns transmission oil faster than the fuel in my tank and smokes from the right side exhaust. From the research I have done sounds like I need crank seals. How much can I expect to pay to have this job completed and what should I look for in a good mechanic for the job?

Yes - you do need crank seals. The failure mode you describe is a classic example of this problem.

Costs vary widely and are obviously completely dependant on the over all condition of the crankshaft components which can not be determined until it is completely apart. If all you need are the seals then Bill Bune Enterprises in Minnesota is well known in the USA for doing this sort of work and the cost would be less than $400 in USD.

With the exception of one bearing, all the other components are still available from Suzuki (seals, connecting rods, big end bearings and crankshaft bearings). If you use Bill Bune, then they will advise what crankshaft components you will need to provide them with.

Suzuki can still supply water pumps (but not the impeller), pistons, rings, small end bearings and gudgeon pins. As well you can buy piston kits from third parties but some are better than others. You will also want to replace the plastic water pump gear which is not available from Suzuki in the USA, but is sold by Suzuki in most other countries (including Canada where I live). Gasket sets are available from many places - I normally use the ones sold by CruzingImage on eBay.

If you are paying someone else to do the repair work (disassembly and assembly), then you want to try and deal with a mechanic that is familiar with 2 stroke engines - a good source could be a larger snowmobile shop if an actual motorcycle shop able to do this work is not available in your area.

Hope that helps !  

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Ian R. Sandy


I can answer restoration questions specifically about the Suzuki GT750 Water Buffalo/Kettle/Water Bottle which was made between 1972 and 1977. I may also be able to assist with some restoration questions on the Suzuki T500 made between 1968 and 1977. I will not answer questions about other makes or models. I focus on restorations - I not especially interested in 'non-stock' restorations or rebuilds.


I wrote the on-line reference manual on the Suzuki GT750 called 'A Field Guide to the Suzuki GT750 Le Mans' which is available at no charge on line. I currently own six Suzuki GT750's - a 1972 (scheduled to be restored in 2013), a 1973, a 1975, two 1976 models and a 1977. I also operate and maintain the on-line reference site 'Suzuki T/GT Resources' as well as the Old Japanese Bikes web site.

I am a member of the VJMC, the AMCA and of the CVMG.

'A Field Guide to the Suzuki GT750 Le Mans' 'Notes from the Corner' - the OJB blog 'The Suzuki T/GT Resource Pages'

Graduate of Sheridan College in Instrumentation Technology, which is interesting but not really germane to this discussion - I owned my first GT750 new in 1974 and have owned and ridden at least one now for very nearly 40 years.

Awards and Honors
My 1973 GT750 was featured as the 'March' bike in the recent CVMG-RMS section calendar.

Past/Present Clients
I am the web-admin for the CVMG, and also for the CVMG-RMS section. I am also a moderator on the Sundial 2 stroke board.

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