You CAN NOT use premix only on a TS185 unless it has been much modified internally. And even the factory racekit didn't do that.
The TS and all Suzukis of that era used a pump to pump oil direct to the crank bearings AND to the intake in very specific ratios. The crank bearings will not be adequately lubed if you only use premix.
Any good quality 2-stroke oil will work fine. Set the pump correctly, and use straight gas in the tank. Simple and extremely reliable, and one of the reasons the Suzukis of that era had excellent crank reliability and general engine life compared to others.
Suzuki was so committed to the system that even the factory 500 GP racer they gave me in 71 still had the pump.
The problem with a pipe is getting the right one. We used to use Bassani, but I'm not even sure they're still in business. It's worthwhile for racing, questionable for anything else. Too noisy. Oh yeah, don't take the baffle out of your stock pipe, despite what you may think it will run slower. Just make sure it's good and clean. Burn it thoroughly with a propane torch. (similar to an oxy-acetylene welding setup, if that doesn't translate!  The oxy-acetylene torch will also work well.
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Grant Johnson
Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com
__________________
Grant Johnson
Seek, and ye shall find.
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Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
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