Downsizing carb on a Rapido 225. Mikuni TM24 anybody?

[adriang]

I whacked a mikuni TM24 on my GP200, replacing the standard delly. Really pleased with it, it seems to be snappier with the response, and is certainly a bit more economic.

Just thinking over the balance between performance and economy, and was thinking about downsizing the carb on my Rapido 225 from a 30mm PHBH to a Mikuni TM24. Anybody tried this, got any thoughts???

Not to worried about performance, I'm collecting parts for an RB based DTC knock-off.

[Train Driver]

24mm mikuni and ancillotti exhaust, this is my jetting which after 2500 miles is still spot on.
Jb dyno'd
main jet 175
pilot 20
needle 5n1b

[adriang]

24mm mikuni and ancillotti exhaust, this is my jetting which after 2500 miles is still spot on.
Jb dyno'd
main jet 175
pilot 20
needle 5n1b

thanks..

more questions!

Was this with an air filter?

what were the figures from the dyno?

And are you pleased with it?

[Train Driver]

Air filter yes/ foam type
Dyno 16bhp 13ft/lb torque all below 6500rpm
Please yes but now running a RT255,the rapido now belongs to cezeta

[corrado]

24mm mikuni and ancillotti exhaust, this is my jetting which after 2500 miles is still spot on.
Jb dyno'd
main jet 175
pilot 20
needle 5n1b

Is that the carb that I now own Paul? The needle sounds wrong though, I'm thinking it's 5N13. I upped the main jet to 195 while running in my Mugello 225. Bottom end seemed very boggy so went down to 17.5 pilot which is still boggy but not getting much time to dial it in at the minute. I'll cope with the rich bottom end but need to do some top end plug checks before riding to IoW on Thursday. I'm using a Breath Swet filter and so far not run it with the panels on. Had plans to try today but it's persisting down oop norf.

[cezeta]

having gone from a 35mm mikuni to a 30mm and got better performance im sceptical of the big carb desire. a well known tuner has insisted he can get similar power from a ts1 from a tm24 and encouraged me to be the guinea pig so there is food for thought there

its not just size but volocity aparently

(now wait for the usual culprits to quote something out of a 1970s book :baddevil: )

martin, it is an sn13......was written funny by john at jb as i recall

[Train Driver]

24mm mikuni and ancillotti exhaust, this is my jetting which after 2500 miles is still spot on.
Jb dyno'd
main jet 175
pilot 20
needle 5n1b

Is that the carb that I now own Paul? The needle sounds wrong though, I'm thinking it's 5N13. I upped the main jet to 195 while running in my Mugello 225. Bottom end seemed very boggy so went down to 17.5 pilot which is still boggy but not getting much time to dial it in at the minute. I'll cope with the rich bottom end but need to do some top end plug checks before riding to IoW on Thursday. I'm using a Breath Sweet filter and so far not run it with the panels on. Had plans to try today but it's persisting down oop norf.

sorry martin i typed it wrong it was 5N13,
the rest i cant help you with it was set up on the dyno at Jb's, with a K&N style filter

[mickdale]

having gone from a 35mm mikuni to a 30mm and got better performance im sceptical of the big carb desire. a well known tuner has insisted he can get similar power from a ts1 from a tm24 and encouraged me to be the guinea pig so there is food for thought there

its not just size but volocity aparently

(now wait for the usual culprits to quote something out of a 1970s book :baddevil: )

martin, it is an sn13......was written funny by john at jb as i recall

hello cezeta - mate in my club is running a tm24 on his ts1 and really rates it.
was wondering about putting my tm24 on my torque tuned ts1 230 but not sure if it will flow enough fuel?

did you get round to trying one on yours?
cheers
mick

[cezeta]

having gone from a 35mm mikuni to a 30mm and got better performance im sceptical of the big carb desire. a well known tuner has insisted he can get similar power from a ts1 from a tm24 and encouraged me to be the guinea pig so there is food for thought there

its not just size but volocity aparently

(now wait for the usual culprits to quote something out of a 1970s book :baddevil: )

martin, it is an sn13......was written funny by john at jb as i recall

hello cezeta - mate in my club is running a tm24 on his ts1 and really rates it.
was wondering about putting my tm24 on my torque tuned ts1 230 but not sure if it will flow enough fuel?

did you get round to trying one on yours?
cheers
mick

no mick......i rode it into a concrete dranage ditch at speed in france instead

so my experiments are hindered for a while, i may have a series 1 cut down as a result soon though using a 30mm kehin in europe this year was an improvement on the bigger carb though thats for sure.

im interested to know what manifold he uses?

[mickdale]

would be interested to know the manifold aswell - i'm using a LTH inlet manifold with the bolt on rubber - wonder if i can get one to fit the carb with the right hole spacing??