1975 gt750 blowing oil out of vent tube

[tinman0313]

New to the site hello. I have a 75 gt750 that I picked up a few months ago I got it going everything is working good other than it's blowing transmission fluid out of the breather tube I suspect it's the crankshaft seals leaking pressurizing the transmission oil was wondering if anyone knows of a good place to have the crankshaft rebuilt thanks

[GTandcbr]

Hi and welcome to the forum. First before you start tearing the motor down. Drain and measure the oil if there is too much in there that's where it comes out. If that is okay you need to get someone trustworthy to do a leak down test to make sure that is the problem. The test puts a small amount of air into the crankcase to see if the seals hold pressure or leak. This will save you a lot of work for nothing if it isn't the seals. I'm sure someone from your side of the pond will be along shortly with a crank recommendation

[jabcb]

Bill Bune has done lots of Suzuki cranks & is highly recommended.
http://www.billbune.com/index.html

[tinman0313]

Hey I appreciate the info I checked oil level and it is low now I lowered it and it didnt start coming out as bad until higher rpm and speed just did a leak down and have air coming out of vent tube so pretty sure crank seals I guess it is time to pull apart and I will contact bill bune next week appreciate that info also

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