What size dynojet main jets are required for honda cbr 600 91-94 in the UK bike fitted with K n N filter and viper end can , and how many turns out on fuel mixture screw. ( lost my instructions) thanks, stan.

put the 35's in the 32 slots , then put 37.5's in the 35 slots

take in mind the setting that they give you is a base setting somewhere to start to get you in the ball park. your rear cylinder going have larger jets then you front due to heat. and where you live is going to affect the jetting as will. this is how you fix your problem. first what is everything set at i.e. main and pilot jet in front carb, needle clip setting (from bottom) and air/fuel. write this down send it to me. next what color is the front plug, what color is the rear plug. what you want is nice coffee cream tan.
Now you can't base dynojet jet sizes ex. o.e.m main jet 150 you could have a dynojet main of the same size but the number will WAY different. I have asked them a dozen times if once why they don't was oem sizing to make things easier on us and all the say "our jets, our sizing" write this info down we will need it later. Get it back to me and we will jet this thing right
fix it right, ride it fast
M.Woodring

Here is a link to a quality system that sounds great. Do not forget to rejet the bike as well. I use jet kits from dynojet.
http://www.bikebandit.com/1992-honda-cbr1000-full-systems/c/a644017?mg=1031&t=1

Intended for motorcycles with a stock engine using the stock airbox, air filter and stock pipe. Stage 1 kits are fully adjustable to allow the use of a well designed aftermarket pipes and stock replacement air filters like K&N. Stage 1 kits are designed to improve throttle response and driveability and in most cases power increases of approximately 5% throughout the entire power range can be achieved.


STAGE ONE INSTRUCTIONS
1. Remove the vacuum slide from the carbs. Remove the stock needles & spacers, noting the order of
assembly. Locate the slide lift holes (Fig. A), with the slide drill DD# 14 supplied, enlarge your slide lift
holes. The picture may not show your slide exactly, enlarge your slide lift hole or holes depending on your
model. Do not drill any new lift holes. Do not drill the needle hole.
2. Install Dynojet needles on groove #4, using all stock spacers. Install the Dynojet washers (2 per
needle) above the E-clip.
3. Remove the stock main jets and replace with the Dynojet main jets provided. If you are running with
stock exhaust, use the DJ110 main jets. With an aftermarket header or slip-on with high flowing baffles,
use the DJ116 main jets. Be sure that the jets you are changing are the main jets.
4. Locate the fuel mixture plug (Fig. B), if you see a screw head, proceed to adjusting procedure. With the
DD #5/32 drill bit provided, carefully drill thru the plugs. Note: the mixture screw is directly underneath this
plug, be ready to pull back on the drill the instant you break thru. Use screw provided to secure and
remove the plug. Carefully turn mixture screws clockwise until they seat, turn out 3 turns.


For further info on this, visit: http://www.dynojet.com/jetkits/motorcycle/honda.aspx

You can find the manual for the model you are searching for. Follow the 1st column "CC" to find 650cc models and you can find your specific model after that.

Thanks for asking.
Regards,
Arvind S Iyer

No it won't run very good, your model has CV carbs, they like that air box behind them, you will need to go to Dynojet and get a jet kit, that will likely fix our problem.

Dynojet

its likley to be running a bit to week,, try opening up the fule mix screw just a bit to let in more fule

if it is the the alternate of the cbr 900rr 1995 bike then replace it but i think , you'd better look for the alternate exhaust if it is cbr 900rrt even though but size matters.