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 Post subject: Gt185 Crank Seals
PostPosted: Sun Nov 17, 2019 6:34 pm 
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Still in the Driveway

Joined: Sun Nov 17, 2019 6:12 pm
Posts: 3
Country: U.S.
Bikes owned: GT185
I’m new to this forum and just picked up a 73 GT185. It hasn’t ran in years and needless to say, both cylinders were low on compression. I was hoping the rings were stuck but they weren’t. Now I’m on to crank seals. This is the first engine tear down for me. Any tips or tricks to make this easier on me is much appreciated. Thanks


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 Post subject: Re: Gt185 Crank Seals
PostPosted: Sun Nov 17, 2019 7:50 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3489
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
An introduction + pics would be appreciated. (You can’t upload pics to this website. Use a photo website like Flickr & post links here.)

Crank seals is a task best left to the pros.
Bill Bune is a specialist shop that does lots of two stroke cranks. Highly recommended: http://www.billbune.com/index.html

Do you plan on doing all of the other motor work?

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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 Post subject: Re: Gt185 Crank Seals
PostPosted: Mon Nov 18, 2019 3:12 am 
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Expert racer

Joined: Mon Dec 01, 2008 2:52 am
Posts: 1203
Location: Manchester, UK
Hi and welcome. Sounds like you'll need to rebore the cylinders, failing crank seals will not cause low cranking compression in the cylinders.

I wouldn't automatically assume the crank seals have failed. For what it's worth, I'd pull the cylinders and pistons and inspect the crank through the crankcase mouths. If it seems OK, mix up some 2-stroke oil and fuel in a 50/50 mix and pour it into the cases and let it sit for a few days, then drain it out. This can refresh the seals a little and lubes the crank bearings too.

_________________
1976 GT380 - wounded by me, and sold on
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed


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 Post subject: Re: Gt185 Crank Seals
PostPosted: Mon Nov 18, 2019 3:55 pm 
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To the on ramp

Joined: Fri Aug 11, 2017 7:09 am
Posts: 415
Country: england
Bikes owned: several gt250 ramairs
i've done the same trick, craig, except i've always used diesel or parafin in the crankcases - they don't evaporate as quick. 185's are a pretty easy engine to work on, the only bit i hate about them is the ridiculous gearchange mech on the left side. sure suzuki could have come up with something better than that :D
cheers, dd.
p.s. if you want to upload photo's, then postimage is dead easy to use and free.

_________________
GTS250 road registered. TS250 engine, Ramair frame.
GT250 big bang road registered. Both pistons fire the same time. USD forks.
GT285 road registered. Overbored - 58mm and TS125 +2 pistons fitted.
GT10 road registered. '65 T10 engine, GT250 frame.


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 Post subject: Re: Gt185 Crank Seals
PostPosted: Mon Nov 18, 2019 6:18 pm 
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Still in the Driveway

Joined: Sun Nov 17, 2019 6:12 pm
Posts: 3
Country: U.S.
Bikes owned: GT185
I haven’t been able to post on this thread all day. I’ve typed out this reply and it keeps sending me to an error page :evil: the crank does spin freely and smoothly. I’m pretty positive the cranks bearings are good. I’m going to try what you guys have suggested and we shall see. Otherwise I’m going to have the cylinders checked and order some new pistons and rings, reassemble and see how she does. Thanks again for the replies


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 Post subject: Re: Gt185 Crank Seals
PostPosted: Mon Nov 18, 2019 6:20 pm 
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Still in the Driveway

Joined: Sun Nov 17, 2019 6:12 pm
Posts: 3
Country: U.S.
Bikes owned: GT185
And I’ll try and get some decent pictures up tmrw. A little background on me is I’ve been into motorcycles for years, I’m 35 but have had an it using from sport bikes to harleys. I’ve always a loved two strokes and love the older bikes styling. I’m not a mechanic by no means, but have a pretty good clue, enough to get me in trouble at least lol.


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