bgm/mb 225 rt

[SpanishSX200]

RT 230
Race Tour RT230
PWK 28
JJK Needle 2nd clip from top
40 slide
45 idle
108 main
Marchald filter
BGM Stator 17 degrees BTDC

This ran perfectly for 20k KM

[Minority]

RT 230
Race Tour RT230
PWK 28
JJK Needle 2nd clip from top
40 slide
45 idle
108 main
Marchald filter
BGM Stator 17 degrees BTDC

This ran perfectly for 20k KM

And then what happened?

[yozzer]

think I will put a smaller pilot in and see if it starts with breathsweet on,

thanks guys

[poppygun]

I also have a new RT230 build which starts really well hot and cold spec is
new rt 225 kit 60mm crank
30mm vhsh
50 slide
145 main
k1 neddle
b38 emulsion tube
dq 262 atomiser
60 pilot
60 idle??
m tec retard tickover 21 deg
dev tour
marchald filter no hole,panel touching bottom by 20mm
a bit rich but using etg and cht may change main to a 138
done about 120 miles and seems very good

[giankx]

RT240 (71x60) no issue when starting from cold or warm.
I have a sweetbreath filter and i did a small hole in the bottom with a pipe for draining the excess of fuel during the spitback. The pipe looks always dry, but i just had the hole in the plastic elbow because i had serious problems starting my mugello when warm.
30mm vhsh
120 main jet
dq262
k98 3rd slot
pilot 70 and b56 emulsion tube
slide 50
float valve 300
9,5gr float
mtech starting from 23 degrees and set to 9
Mito reverse clubman
did over 5000km without issues.

[SpanishSX200]

And then what happened?

Minority,

I took it off and replaced it with a reed valved RT, that Mark did for me. Have just completed Avignon on the new kit. The old RT will be getting the same treatment. I can run the reed valved one with an open carb with no spit back. And it gives me another 6-8 BHP.

Simon

[mnpes]

ARE THE PILOT JETS FITTED KEIHIN JETS ?

GENERALLY COPIES ARE NOT ACCURATELY SIZED ~ COPIES COULD BE LEANER OR RICHER THAN STAMPED

LIKE EVERYTHING ELSE YOU ONLY GET WHAT YOU PAY FOR ~EG ... A COPY KEIHIN IS NOT THE QUALITY OF THE GENUINE ARTICLE

I"ve found running small pj"s even on original Keihins is not good medicine

Monitoring an original pwk28 carb up with an onboard air-fuel-ratio gauge etc

The small pj"s ran dangerously lean when throttling right back >>>> " Heading for nip-up land " especially after a good 3/4 to full throttle run

**** MONITORING WITH JUST PLUG-CHOPS WOULDN"T SHOW THIS WEAK SPOT ****

[Minority]

And then what happened?

Minority,

I took it off and replaced it with a reed valved RT, that Mark did for me. Have just completed Avignon on the new kit. The old RT will be getting the same treatment. I can run the reed valved one with an open carb with no spit back. And it gives me another 6-8 BHP.

Simon

Sounds sweet Simon, you've got to be happy with 20k, that's a fair few km!

[Minority]

ARE THE PILOT JETS FITTED KEIHIN JETS ?

GENERALLY COPIES ARE NOT ACCURATELY SIZED ~ COPIES COULD BE LEANER OR RICHER THAN STAMPED

LIKE EVERYTHING ELSE YOU ONLY GET WHAT YOU PAY FOR ~EG ... A COPY KEIHIN IS NOT THE QUALITY OF THE GENUINE ARTICLE

I"ve found running small pj"s even on original Keihins is not good medicine

Monitoring an original pwk28 carb up with an onboard air-fuel-ratio gauge etc

The small pj"s ran dangerously lean when throttling right back >>>> " Heading for nip-up land " especially after a good 3/4 to full throttle run

**** MONITORING WITH JUST PLUG-CHOPS WOULDN"T SHOW THIS WEAK SPOT ****

Thanks for the heads up! What would you consider to be "small", I'm running a 40 at the moment.

[mnpes]

If only it was that easy to say what " Is small "
No 2 engines jet the same or rarely
Used the Keihin on 2 similar set-ups ended up slightly rich using a 42 and a 45 ~ So the " 40 " is not far-out
If you look on Scootrs"s tech site "Carb settings for the Keihin type carb" ~ The different sizes people use for pilot jetting is somewhat "Eye Opening"
Mr.B who sells the BGM copies states somewhere about jetting their product ~ " People tend to jet these carbs to rich "
So it boils down to your choice ~ But best to run the richest you can rather than leanest