yamaha xj750 seca engine

Hi lads, i've put a 750 seca engine in my maxim, can someone tell me is there supposed to be
a plate covering the main air#80 and pilot air#225 under the diaphram in rhe carbs. im using the maxim carbs in the seca engine. main jet #120 pilot 40. it shows a plate covering the main air and pilot air in the seca carbs but not in the maxim CMSNL schematics. Thanks.

 

plate is a part yamaha used then stopped using it is not needed
Same jets are used in 750 maxim and seca
if you look at this link you will see specs for US bikes. also Canadain and Euro Seca which have different jets. the US bikes had to meet EPA requirments. That is why there is a difference.
What you have will work fine.
http://xjbikes.wikidot.com/carb-specs
XJ750 Models:

Years & Models: 1981-3 XJ750 Maxim, Midnight Maxim, and Seca USA models
Carb Manufacturer: Hitachi
Carb Series: HSC32
Carb Model ID: 15R00 (Maxim, Midnight Maxim)
Carb Model ID: 5G200 (Seca)
Main FUEL Jet Size: #120
Pilot FUEL Jet Size: #40
Main AIR Jet Size: #80
Pilot AIR Jet Size: #225
AIR COMPENSATOR Jet Size: #36
Starter FUEL Jet Size: #40 (non-replaceable, in float bowl)
Main jet NEEDLE ID: #Y-13
Main needle JET Size: #3.2mm (the main needle JET is also known as the "power valve" or "emulsion tube").
Fuel Level in float bowls: 3mm +/- 1mm (.118" +/- .039")
Idle RPM's: 1,050 rpms

 

Thank you, while im here, did i read somewhere that the main air and main pilot air jets are
wrongly shown fitted in the haynes manual.Thanks.

 

yes Haynes is wrong this is corrected photo

 

thanks, so pilot large will be 80, small 225 and are you saying this hole needs planking?? Thanks

 

[QUOTE="sydmac, post: 637500, member: 15253"/QUOTE]

 

Thanks so will it be Pilot large 80, small 225 and is the hole to be blanked? Thanks again.

 

if by planking you meen the cover that goes over air jets , no it is not needed. the screw is not needed as the hole for screw goes no where

Main AIR Jet Size: #80
Pilot AIR Jet Size: #225

for hatachi carbs the number is a metric drill size

main air jet is smallest diameter #80

 

just like in photo the Main AIR Jet Size: #80 goes closest to the screw hole for plate