Bridgestone Motorcycle Parts Discussion Board

Bridgestone Tech Talk => 175 & 200 Talk => Topic started by: mikandrsn on May 09, 2021, 09:30:54 PM

Title: Leaking 2 stroke oil
Post by: mikandrsn on May 09, 2021, 09:30:54 PM

Recently purchased a really nice dt175. The only issue is it leaks 2 stroke oil out of the left carb. (about 10 drops per day). Any suggestions on what my problem might be. Thanks

Title: Re: Leaking 2 stroke oil
Post by: OldSwartout on May 10, 2021, 08:32:16 AM

The check valve in the oil line isn't seating. Not sure they're repairable, but might just have some debris it it.

Title: Re: Leaking 2 stroke oil
Post by: mikandrsn on May 11, 2021, 03:03:10 PM

thanks I'll check them

Title: Re: Leaking 2 stroke oil
Post by: Old BS Guy on May 23, 2021, 11:25:55 AM

Most certainly check valves are a problem, especially with a bike that has set for a long period. The additive packages in some 2 stroke oils tend to separate and gel around fixtures and low points. (Gummy). As memory serves, some early check fittings were rebuildable, latter was not. That change occurred on DT175 twins after Oct. 1965 production. ALWAYS a good idea to check your tank filter as well, making sure it has integrity and isn't collapsed or compromised. On unknown new projects it's good to start from supply and work through to delivery points. Saves grief.