TZR 250 2MA _ Pickup/Stator

[muttsnuts]

Ok, odd question here, just been looking at a bike for a chap, sorted a few issues out but after testing his pickup its way out, or according to the workshop manual its way out, so ideally to prove my theory it would be useful for somebody who has a TZR250 2ma to test the pickup and let me know their readings (this thing is reading 259 ohms), or even better is if somebody happens to have a spare stator assembly I could loan to prove it is the pickup, I am 99% certain it is, but the poor guy has had this bike to everyman and his dog (and had his leg lifted each time), so needless to say he is sceptical about putting anymore money into it - I can see his logic, on the plus side I fixed a load of other issues and the bike is runnng much better, but not right, and I want it spot on

Let me know if anyone can help me out, would be greatly appreciated

To test the pickup, its the following

white/green and white/red wires (2 block comnnector near the battery) should be between 90 and 140ohms I beleive

[Eyrey1]

or tdr 250

[muttsnuts]

aye, or one of them as well !

[paulsx]

I thought they were different anyway got a tzr lump at home can do either for you but not back till Monday if you can wait

[Eyrey1]

Aug 27, 2016 19:24:28 GMT 1 paulsx said:

I thought they were different anyway got a tzr lump at home can do either for you but not back till Monday if you can wait

SAME just different plugs on wires

[muttsnuts]

Aug 27, 2016 19:24:28 GMT 1 paulsx said:

I thought they were different anyway got a tzr lump at home can do either for you but not back till Monday if you can wait

Hi Paul, just doing a reading for now would be great, if nothing else it would confirm my thoughts, then I can see if he would be happy to have a new pickup fitted, or if he wanted to have a spare stator assembly fitted to prove it once and for all, so really appreciate it - Monday/next week is fine

[db8888]

Hi DAVE just checked 2x 2ma pick-ups ones 255ohms and the other is 234ohms also checked them on the gen Yamaha analogue meter and reading are around 250ohms manual figure is 94/140ohms
I also checked figures from a gen yam data book which says 117ohms + or - 20% what is the running problem with the bike

[muttsnuts]

Hi cheers, yep it seems the manual is wrong, I was a little sceptical because they normally vary by 10's not 100+ ohms, hence why I asked, it seems the one on the bike is fine, which is good at least

The problem is its not as crisp as it could be, a little lack lustre at the bottom end and chokes a little at the top end, I sm actually tending towards the exhausts being partially to blame, I've done the carbs and that made a big difference but its just not as snappy as others I've worked on. The engine has had a full rebuild (not by me), but it seems ok, although compression is lower than I'd expect as well, but could be it just needs some more running, but I'll be doing a leak down test on it at some point.

One of the other issues is when you rev it up in neutral and let the rev's drop back, it drops below tick over and nearly cuts out, but idles fine if you just give it a quick blip, it only does this when hot, which is why I was wanting to get the readings for the pickup

I'll need to look into it further, any thoughts let me know

Regards

Dave

[db8888]

sounds rich for some reason when you rev the motor hence worst when hot just a thought has any one removed the ball bearing at the inlet side of the carb ( F3 MOD )
I have checked the compression readings on tzr250 after being rebored and run in and they are always around 115 psi with motor temp about 80 degrees c

[paulsx]

Hi just checked the one I have here 114.6

[db8888]

just checked tdr250 spec in yam data book says 235 + or - 20%

[paulsx]

Well thus one definitely reads 114.6. It's an early tzr250 motor maybe a 1kt I think.

[4l04ever]

1KT and 2MA manuals available here :-

pure2strokespirit.net/

See if they use the same pickup :-)

[paulsx]

2MA manual on that link shows it as 94-140 ohms which gives a rough mid figure of about 117

[muttsnuts]

Aug 29, 2016 21:40:32 GMT 1 paulsx said:

Well thus one definitely reads 114.6. It's an early tzr250 motor maybe a 1kt I think.

well that is interesting Paul, so the manual could be right, and it could a difference between a 1KT and 2MA stator, this is a 1KT I am fairly sure, but might have a 2MA stator fitted, in which case that could explain a few things if they need to be paired to the CDI like the YPVS's etc, get them wrong and you have allsorts of running issues

[paulsx]

Not sure about TZR's but I was always sure there was a difference between TDR and TZR stators but I could be wrong. The TZR one here definately measures 114.6 which ties up with the 2MA manual on the pure2strokespirt site.

[4l04ever]

The parts books are showing different part numbers for stator and flywheel between 1KT and 2MA, so not the same.

[muttsnuts]

ok cool, that is very helpful

[db8888]

Hi I know you can change the cdi from the 1kt to the 2ma but you have to cut the plugs and use different connectors so this proves the stators and cdi are compatible with each other
the cranks are the same so the woodruff key will be in the same place . but the flywheels have different part numbers so they are possibly meant to match with the correct stator I have a
2ma stator and flywheel on the bench if you want some pictures to compare with yours the number on the 2ma flywheel is 032000-6311 I don't have a 1kt flywheel but have a tdr flywheel and
the number on that is 032000-6600 if you hold the tdr flywheel on top the 2ma flywheel so the key ways line up the the tdr looks about 10 degrees advanced looking at the pick up triggers
hope this helps

[muttsnuts]

HI, that's very helpful and I'll make a note of that and check the bike when it comes back for the next round of trying to figure out what is wrong with it, really appreciate the info