my 4FL...

[Toop]

It should not be wrong, with a small displacement, single cylinder ... enlarge the difference in speeds makes very wise behavior (for industry that restrict, it depollue ...).
For us a sporty staging is dynamic behavior, even everyday on the road 

I will come back with the SP staging, I must have the references of the gears that differ from the 4DL 

[41juergen]

Perfect, thank's a lot!

[Toop]

Have a look at this :

4DL2 is TZR-SP
3NC is DTR-TDR origine 
4JT is tz125
1C3 is yz 125 +2003

[Toop]

There are plenty of elements to cross, a gearbox of a utility road bike is the worst of the worst case ...
You will notice that the YZ is quite similar to the TZ with the exception of the primary gear ratio ... I let you interpret this fact where one pulls short and the other long, while neither is overdrive 

[Martin77]

Do all the TZR125 gears fit in all models?

[Toop]

4DL1, 4DL2, 4FL, 5AE,4FU have similar cases and similar gearbox
3BN (DTR and TDR) have trees, pinions, bell clutch similar to TZR and so must exchange

2RH is similar to the DTR and also to the TZR of this top (I have to compare the bearings to be 100% certain)

I prefer working from a transmission 4DL by its staging and excellent finish

[41juergen]

Update: this is the latest setup, now working on getting the parts togther for the engine upgrade, will start with a TZ setup and will do my own cylinder later..

[Toop]

Great 

[TZRtim]

Looks very nice , ill be copying the chain guard like yours . What are them mirrors off ? There tiny

[41juergen]

Back on the days they introduced them as "F1 mirrors"....  But they are tiny and do their job, you can get them e.g. here..

https://www.ebay.co.uk/itm/173485279273?ViewItem=&item=173485279273

[41juergen]

Just a question to the ones having more know how than I have:
I have 2 different cranks for a DT125 / TZR125, they have a different thread for the primary gear:
one with M12x1,25 mm, the other with a M10x1,0 mm thread. Did Yamaha made a change of the threads during the different model years?
cheers
Juergen

[Toop]

I know there are two different crankshafts, one with long tail ignition (the case with electric starter) and another medium tail (starting with the kick only -> DTR first generation) 

[41juergen]

Thanks for the feedback Toop. I have both cranks, but they have the same "long" cone. One is for the TZR with the e-starter, the other is for an older "kick start" DT, the lenght is the same (at least for these both variants)...
But that would not explain my current problem, may be somebody wrecked the thread at that crank and "modified" it later for further use?

[Toop]

This story is strange to me 

[41juergen]

Just another question: the ones who own a 4DP or 4TW: can you do a picture for me from the rectifier connector showning the position of the different cables (the 2 white, 1 red and 1 black ones)?
cheers
Juergen