50-125cc Trials engine

[brunow - 007]

Hello,

So i'm looking for a spare engine for my TR35 Beta (50cc)
The current engine spare parts are of Unobtainium or extreme expensive.
The clutch is slightly worn out and i hope it will last some time.

But i like the bike!

So the idea is to run the bike for the rest of the season.
And rebuild the bike this winter to twinshock & install new engine.

AM6 / DERBI engine.
+Lot’s of spare parts
+performance upgrades.
+Cost of a tuned engine quite high (70cc, good crankshaft, heavy clutch) -> 300-400€
+ Engine size is quite the same, some welding required

-Still a 50cc gearbox -> easy to fail
-Water cooled (cost of radiator, non classic look)

Honda mtx / Tml – Suzuki Ts x 50cc engine
+Air cooled!
+Engine size is quite the same, some welding required
+Lot’s of spare parts
+Exhaust exit in the middle
+performance upgrades. (cheap)
+Proven engine from the Tlm50

-Still a 50cc gearbox -> easy to fail
-420 chain instead of 428

Suzuki AX100 engine
+Air cooled!
+ only 22kg crate weight (with kickstart, carb & elektrics)
+ Square bore/stroke (50x50mm) -> 98.2cc
+ Low compression -> No chance of overheating while driving slow
+ 428 chain -> same as the beta
+ Low first gear ratio -> 32/11
+ Cheap parts:
Clutch same as Suzuki A100 -> 30€ new plate & springs
Bigbore upgrade (115cc) 50€
+ Engine size is quite the same, some welding required
+ Good price for NEW engine
+ Still produced for export markets (india, africa) proven engine

-low power 5.9 – 7.8 BHP to start with (tuned 50cc power)
-The exhaust goes tot he right instead of the middle.

Any more?
I like the AX100. It’s a heavy gearbox / clutch / crank with little chance of breaking.
There is room for upgrades and they are cheap!

[mattylad]

Have you thought about a ready made trials engine with tons of spares available?

The legendary TY80 or maybe the bigger TY125/175. 

[suzuki250]

If you are going to change the engine and convert it to twinshock why not just buy a TY and save yourself some work and money?

Edited May 5, 2017 by suzuki250

[mcman56]

DS80.  Newer models are called JR80.  They have a solid reliability reputation.

http://www.suzukicycles.org/DS-series/DS80.shtml

 

[brunow - 007]

Thanks, it seems that the RM / DS engines were used on low cc trial bike's.

Will look around some more

Edited May 6, 2017 by brunow - 007

[FHedman]

I'm in the same situation.
Which engine did you choose?

[2strokesforever]

Bump!