Hi Rhys. I've had many of both and still have two TSs.

The TF & TS 185 motors are almost identical. You probably know the TF (Suzuki called it the MudBug) was for farm work and had some minor tuning and gearing changes to make it more suitable for that. The barrel porting is different, especially the exhaust port, and it has a smaller carb. This have a noticeable increase in low end torque. It has a smaller front sprocket and larger rear sprocket for lower and slower gearing for climbing steep hills, and for dawdling behind walking herds of livestock. Other than that, the motors are the same. The TS185ER was about 18.5hp and the TF was just over 13hp.
I had my TFs for dairy farm work and they were just the best farm bikes. I had a TS barrel that I'd had ported slightly giving about 20hp, with a correctly jetted carb attached. I used to use this for trail riding. When I was going trail riding, I'd undo the exhaust studs, head studs, plug lead, and air filter boot on the TF motor and pull the barrel and carb off. The tuned TS barrel and carb would go on giving a decent increase in power. I could do it in about 10-15 minutes.
Another tip with these motors is NEVER run them on pre-mix fuel, except for the first start after a rebuild. The CCI oil injection system feeds into two points. One is directly to the piston, and the other to the left main crank bearing and the big end bearing directly. They will run for a surprising amount of time on pre-mix but these two bearings WILL fail in time. Also the CCI system automatically varies the oil to fuel ratio according to the load on the motor, from a low of about 110:1 up to about 25:1 under full throttle. You get less carbon and oil residue build-up on the piston, exhaust port and inside the exhaust pipe and silencer.
Hope this helps. Where are you? The TF was sold mainly in New Zealand and Aussie.

Best regards
Nigel in NZ.

__________________
The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription

Huh, so this would have explained why the '73 TS185 I used to have kept needing new bearings every 5 minutes ... you live and learn!

Thanks for posting that info

er, yeah! Suzuki had the very best oiling system available, the direct bearing lube went a long way to their reputation for reliability and longevity. On my TS185 RACE bike, I adjusted the pump higher - to the max setting, but still variable according to throttle opening as it was often plonking along at low speeds, and ran pump gas. As I recall, the standard Suzuki race kits simply said wire the pump full open, and run straight pump gas. The factory TR500 I raced ran this way and worked fine, as did a TR250 I know, and my own TR-ized T20.

__________________
Grant Johnson
Seek, and ye shall find.
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Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com

Note that the Suzuki bearings that were direct oil injected, had a shield to keep the oil IN the bearing, with of course lots leaking past to lube elsewhere - but that shield would largely PREVENT oil from getting TO that bearing from the PREMIX.

__________________
Grant Johnson
Seek, and ye shall find.
------------------------
Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com

I got it as a very tired "field bike", it was a real death trap, lol

Didn't keep it long, and I had my street-legal looking DT100 so I just went back to that (the oil pump on the DT never gave me problems, but lots of people hated them at the time)