Mikuni Jets

YZF750R · Post by **YZF750R** » Fri May 09, 2014 11:03 am

Hi,
Just bought some K n N Pods and the blurb that comes with them recommends that you increase your jet sizes by 15%.
On my Model 1993 YZF750R the jet sizes are
Main Jet
#1, 4 cylinder - #125 which will increase to 143.75
#2, 3 cylinder - #122.5 which will increase to 140.875
Pilot Jet #45 which will increase to 51.75
Starter Jet 57.5 which will increase to 66.125
Does anyone know of anywhere in the UK I can source Mikuni Jets?

banner001 · Post by **banner001** » Fri May 09, 2014 11:08 am

yup:
http://www.allensperformance.co.uk/mikjets.html

Post by **nuggitt** » Fri May 09, 2014 11:23 am

You could try these too.

JETS

YZF750R · Post by **YZF750R** » Thu May 15, 2014 9:54 am

Decided to go with the Factory Pro Street 30 kit
4 x #130,
4 x #135,
4 x Needles + Clips.
4 x Titanium Emulsion Tubes
Let the carb setup fun begin.
Object... Get rid of fecking useless airbox and replace with K n N Air Filters. Also smooth out flat spot in the middle part of the rev range, due to lack of exup valve.
Standard Jets are #125's, do I go for the #135's first, with the needles set at their standard position or hedge my bets with the #130's and play around with needle clip position and float height....

banner001 · Post by **banner001** » Thu May 15, 2014 10:25 am

on my race bike i have always tried to get the bike fuelling ok, so that it will run up to full rpm ok, then i tune it from top down:
main jets
needle clip position
pilot jets

i usually set float position to be slightly on the rich side of "standard" and tune from there.

YZF750R · Post by **YZF750R** » Thu May 15, 2014 10:32 am

Thanks for the tips.

Which club do you race with?

banner001 · Post by **banner001** » Thu May 15, 2014 12:38 pm

its just a dedicated track bike at the moment, i dont think i can afford to go club racing, both in time and money as i already work a 70-hour 7-day week

i go to mallory, donnington, rockingham and silverstone when they have deals on, or when i know im free, as they are close by (within an hour), engine is putting out ~64bhp at the moment which sould make me eligible for the sub-64 class if i want to go that route, im looking for donor engines at the moment so i can build up a collection of race engines that i can swap in as rebuilds are underway, main thing is trying to get the weight down and im toying with the idea of cutting my radiator to fit ram-air along with new fairings.