Carbs cleaned and new Mains installed?

[Shack]

Hello Again,
I was at the YAMMY dealer and the main Mechanic was at the counter parts. I picked up my new main jets and asked for some pilot jets...Main jets 147.5 and He said I wouldn't need pilots..just put new mains and it would be OK..I am putting on new individule filters and am I have read the xs files and they recommend going up in the pilot jets.. I wasn't able to get new pilots..they didn't have them>>>What should I do..chance the mechanics advice or what?????? Let me know your thoughts.
Thanks
Shack

[tsears]

no pilots carbs

Hi,

I have a bank of these 'no pilots' carbs on my '80 SG. They are NOT the stock carbs, and the pilots are capped off with screw on caps. Consequently, I believe, the mains are quite large, mine are 145's. I tried running it with the pilot holes uncapped, the stock (42.5) pilots, and a variety of mains from 110 to 145. All situations failed miserably, so I recapped the pilot holes and went back to the 145's. Runs great like that and produces good tan plug color.

Good luck,
Tim

[crunchbird]

Those capped off pilots are fed by a little passage coming over from the main jet. You can still play the pilot jetsize game but you need the caps on. If you are so inclined.

[Shack]

Thanx,
My 79 has removable pilots but Yammy mech said usually no need to change them...Any of ya with a 79 or experience help...I don/t want to lean the bike out????/ Will it be alright to put the carbs on and try it???? Or with the indi filters will I hurt the engine???? Please let me know..
Shack

[skids]

I am pretty sure that the E, F, and SF have a passage between the main bore and the pilot bore. I have SH and H carbs that do not have the interconnecting passages. The pilots are also open to the gasoline without plugs. The screw-on plus were stock on the older carbies. That is NOT to say that Yamaha wouldn't have used up the surplus carbs that were on hand to produce the 80 models...

Originally posted by crunchbird
Those capped off pilots are fed by a little passage coming over from the main jet. You can still play the pilot jetsize game but you need the caps on. If you are so inclined.