carb jetting

[tjfisher30]

ok after read the rejetting tips here is the question i have a 80 sg with stock exhaust and soon to be individual air filters now reading the rejetting i come up with 112.5 and 122.5 but i cant find those sizes but i can get 115 and 125 's will this work right and should i got up on on the pilot jet but seeing how i didnt got up 3 jet sizes i should not need to ?

[TADracer]

Give'em a try

Jets should be sized in 2.5 increments so your mains will be one size larger than the recommendation. The recommendations are not set in stone but are a starting point. Since the mains do not really come into play until after half throttle, give them a try. Your pilots handle from off idle through about 1/3 throttle and some of this can be adjusted with the idle mix screws.

My 79 special has individual air filters and 4 into 1 header. I am up four sizes on the mains and one on the pilot jet....not exactly what the tuning recommendations say but that seems to be the sweet spot for my bike. So, I would change the jets, go for a little ride and see how it feels. Then read the spark plugs and see if they are light tan.

[trbig]

I'm just not understanding why you can't find those sizes?? They should be available. I don't know where you looked, but they are out there. Good luck with whatever you decide. A tad on the rich side would be better than lean anyway with these bikes.

Where are you getting the Pod filters from?? You might do a search and read about them... quite a bit of discussion about suppliers and problems with some.

Tod

[chopwatchagot]

I found the same issue while looking for jets for my 80G. It seems that from 110 to about 125 the sizes go up in increments of 5 and then from there on they go up by 2.5. Check Mikes xs, they have the whole lineup and good prices.

[TopCatGr58]

Hey TJ,

Have you pulled the mains out yet?? Contrary to what the "Book" says, many of us have found the same size jets across all 4 cylinders, instead of the staggered setup that is published!?

So it's not really necessary to stagger them, was just Yamaha's attempt at trying to keep the inner cylinders cooler by making them a little richer! You may not need to try to find so many different sizes.

Bike Bandit has them, but can be a little hard to find them on their site. You have to go and select carb accessories, and then you'll find them.
T.C.

[tjfisher30]

jets

there are two differnet jets bike bandit has them but the have the small round head not the large round but the treads are the same can i use either i know that the carb has the large as oem but i dont think that matter does it ?

[TopCatGr58]

Hey TJ,

Well, I'll be damned but the large head BS30/96 style main jets are NO LONGER shown!? I don't know what to say, Xcept I'm sorry! But, no, you can't use the smaller head ones, those are used for air jets, but you need the large head style for the carbs!

BikeBandit's LIVE HELP was closed, don't know if it's a matter of accidental omission, or if they have truly quite carrying them, but I would think they would want to carry the large head jets!?!?
Again, sorry for the mis-information!
T.C.

[red bandit]

If you write Bike Bandit they will order them for you. Tell them what you are looking for and what size.

[Brian_D]

Have you checked the prices for the N100.604 main jets from Bike Bandit??? $10.68/ea

I ordered 4 N100.604 Mikuni jets from JetsRUs for $12.36 plus $7.23 shipping & handling and received them within 5 business days via USPS. Not as cheap as some but definitely cheaper and faster than Bike Bandit.

[skids]

Re: jets

If they are "main jets" it does not matter if they are the smaller diameter of the big diameter. They are metered the same. I think the hex style is different though (not sure).

Originally posted by tjfisher30
there are two differnet jets bike bandit has them but the have the small round head not the large round but the treads are the same can i use either i know that the carb has the large as oem but i dont think that matter does it ?

[tjfisher30]

Originally posted by Brian_D
Have you checked the prices for the N100.604 main jets from Bike Bandit??? $10.68/ea

I ordered 4 N100.604 Mikuni jets from JetsRUs for $12.36 plus $7.23 shipping & handling and received them within 5 business days via USPS. Not as cheap as some but definitely cheaper and faster than Bike Bandit.

faster maybe not sure yet but cheaper no i just got 8 jets 2 sets 112.5s and 115 for 17.27 and 4.00 for total of 21.98

[tjfisher30]

Re: Re: jets

Originally posted by skids
If they are "main jets" it does not matter if they are the smaller diameter of the big diameter. They are metered the same. I think the hex style is different though (not sure).

skids your right well at least that what the guys at motorcyclecarbs said they will fit and both large heads and small heads the holes are the same and the threads and depth the only diffrence is the large head is 8mm and small is 6mm but i will let you all know for sure when they come in i will be trying them if somehow they dont work whats 20 buck ive screwed up worse before for a lot more money

[Brian_D]

thats a good price - Bandit charged me $10.68 plus shipping for qty 1 jet (#110) - and it took almost 20 days for delivery.

[chopwatchagot]

Mike's xs has the large round head jets you need. They are 2 for $6.00 The hex head jets will not work. They have different threads.