TDMR40 question

[dandywarhol]

I've just picked up a pair of Mikuni TDM40 carbs stamped TDMR 40D6 T731.

The parts manual shows a linkage for accelerator pumps (part numbers 93/94) but there is no link and bellcrank on mine. What do others have on their TDMRs?

http://www.allensperformance.co.uk/images/exp-tdmr.gif

[dandywarhol]

Think I'll answer my own question. The carbs were built from a bank of 4 for a ZZR1000. Only one of the carbs has the pumper and feeds the others by pipework.

Someone has a pair of carbs with a pumper and I've the other pair.

Has anyone used a set of TDMR40s without an accelerator pump? I'd be interested to know before \I send them back to Germany under Ebay misrepresentation rules

Cheers, Alan

[Tarwetijger]

I am using TDMRs with acc pump, yes. But I doubt if it will do worse without them.
All they do is just squirt a load of petrol in, getting the mixture too rich for a short moment.

[dandywarhol]

Thanks Mr T. I was wondering if there would be a big flat spot under acceleration? I've dealt with auto engines where the accelerator pump has been faulty and the car has been a pig to drive through the "hole" in the fuelling.

The seller is willing to take them back - think I'll do it - unless anyone has used TDMRs without the pumper...........................................

[M.V.]

Tried to set up a set of flatslides on a friends bike from a two stroke (no accelerator pump), don't do it.

[dandywarhol]

Thanks MV. Out of interest, what 2 stroke had pumps?

I once had a racing RD200 with 32mm Amals which had powerjets fitted but they weren't mechanical pumps, they relied on vacuum to add the extra fuel at full throttle

[M.V.]

Not sure, but these were jetted way too big stock, so I assume the two strokes are much richer but don't use a power jet, probably because they are usually at full throttle or off (or should be I guess!)

Even jetting them back to normal ish we still couldn't get consistent results with partial & quick WOT.

[misterdimwiddy]

When my FCR41's had an accelerator pump fault (no fuel pumping) the motor ran dreadfully. The pump is there for a reason and it will be a pig to ride without it in my opinion.

[dandywarhol]

Thanks for all your replies - I've sent the carbs back to Germany. Still looking around for a pair.................

[brockzila]

So if you got hold.of a.full bank of four carbs it would be possible to make a set of carbs for a trx with a 40mms bores?

Try a zzr forum. That motor.has an issue with spinning main bearings so there will.be a.few sets of carbc with out motors around.

[dandywarhol]

Yep, been looking down that route ☺