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 Post subject: Gearbox oil leak
PostPosted: Sun Jan 14, 2018 11:32 am 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
I seem to have an ongoing oil leak from the bottom of my H2B engine. It's gear oil. It's not coming from either side cover or shift shaft seal, sprocket or clutch pushrod seal. There is some on the back of the gearbox and I don't have the oil breather tube, but didn't think that would cause it, think the low pressure from behind the gearbox might cause the oil to swirl up there from underneath. Pretty sure it's not the oil drain plug gasket. I don't know if the cases were sealed around the studs, between bearings etc. I did have the carbs leak earlier but have fixed that finally. Any tips?

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: Gearbox oil leak
PostPosted: Sun Jan 14, 2018 12:44 pm 

Joined: Sun Sep 01, 2013 10:52 pm
Posts: 1222
Location: South Dakota
When I can't find the source of an oil lead right away I use talc powder or sometimes flour. I clean the bottom of the engine real good and with a sponge covered with powder I kind of "poof" it all over the leak area. You should be able to trace the origin of the leak this way. It is a little messy but worth it.

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1969 H1, 1971 G3SSA, 1974 G5, 1973 H2A, 1975 S3A, 1975 H1F, 1973 Z1, 1988 HD FLTC, Captain America chopper, 2000 Excelsior Henderson, 1965 Bridgestone BS90


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 Post subject: Re: Gearbox oil leak
PostPosted: Sun Jan 14, 2018 4:11 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
I'll see if I can do that, a hard area to figure out with all the crankcase ribs and the center chamber under there as well. I had a feeling it was coming from a case stud, but that is a low point so it would go to there anyway. The cases have had the mounts sleeved by my brother, I don't think those are a leak source though, knowing him the bushes will be shrunk in place tight, and shouldn't go through to the inside.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: Gearbox oil leak
PostPosted: Sun Jan 14, 2018 6:38 pm 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3137
A couple of things to remember, the transmission oil capacity is 1.30 to 1.50 quarts of gear oil, and, some Kawasaki's have somewhat compromised side stands, allowing the bikes to sit at a rather more acute angle on them, which raises the level of the oil against the clutch push rod and output shaft seals when the bike is on that more aggressive side stand angle.

Just a couple of things to consider.


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 Post subject: Re: Gearbox oil leak
PostPosted: Sun Jan 14, 2018 10:41 pm 
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Joined: Thu Sep 29, 2016 4:32 am
Posts: 615
Location: Indianapolis, IN
Because of my chambers, and the fact that I didn't have an H2 side stand, I made this one out of a KZ750 stand, cut and welded it to fit. I don't like bikes that lean over too far on the side stand so this one doesn't. I'm building a center support lift for the bike now to be able to lift both wheels off the ground at once to service it easier, I'll get a better look when I can get it up like that I hope.

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1974 Kawasaki H2B 750, 1981 Yamaha XV750 Cafe, 1986 Kawasaki KDX200, 2003 Honda XR100, 2004 SDG140. 2006 Ninja 500R Turbo intercooled fuel injected.


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 Post subject: Re: Gearbox oil leak
PostPosted: Mon Jan 15, 2018 4:42 am 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3137
For my H2R engined street H2, I did a set of very tucked in chambers. I literally moved and rewelded the side stand mount on the frame. I also dislike laying the bike over on it's side from a compromised side stand. As race bikes have, I built both rear and front end axle stands to hold the bike straight when needed.


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