main jets 6mm?

**Wed Mar 25, 2009 5:08 pm » Post: #1 » Download Post**

Searching brought nothing up si to save me taking the carbs off can anyone tell me the main jet size on a mc21, 6mm x 8mm?

**Wed Mar 25, 2009 5:12 pm » Post: #2 » Download Post**

Why not just order them by part number?

Main jet part number formula here!
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Andy.
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**Wed Mar 25, 2009 5:21 pm » Post: #3 » Download Post**

edit, cheers andy

i wonder what the price comparrison is like ordering them from allens performance or direct from honda... will have to check

**Wed Mar 25, 2009 5:30 pm » Post: #4 » Download Post**

The Keihin part numbers and the Honda part numbers are the same... so even if they come in little bags with little white/green Keihin stickers from Allens instead of red/white Honda stickers, they are exactly the same part.

I doubt there will be a huge difference in price.
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Andy.
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**Wed Mar 25, 2009 7:09 pm » Post: #5 » Download Post**

Hi ,

What do you do when you need a size bigger than 220 . I tried to get a bigger jet from my supplier and they said that 220 was the maximum size .

Do i drill the jets out ?

Thanks for any info .

Neal

**Wed Mar 25, 2009 7:16 pm » Post: #6 » Download Post**

get a bigger carb instead Very Happy

**Wed Mar 25, 2009 7:26 pm » Post: #7 » Download Post**

I am running mc 28 carbs , the rules in my class don't allow me to change to bigger carbs . I am worried because i am now going to run 35/1 premix instead of 40/1 .
It is only the one track that i run 215's , the track is on the coast with a long straight !

Any advice ?
Thanks Neal

**Wed Mar 25, 2009 7:38 pm » Post: #8 » Download Post**

just back on topic, cross referencing the part number (393) the
main jets the nsr uses are 6mm bore x 8mm

sizes 60-200 available, taken from allens

"Keihin Jets are sized in steps of 2 and 3.
Eg: 100,102,105,108,110.
This is probably to avoid engraving ".5" on the jets"

cheers

**Thu Mar 26, 2009 2:31 pm » Post: #9 » Download Post**

Hope this helps people save a few quid.

The honda dealer price for Jets I enquired about:

99101-393-1250 £3.93+VAT

99101-393-1300 £4.79+VAT

99101-393-1320 £5.85+VAT

Allens Performance

all of the above sizes were £2.95+VAT

Thats a good saving

**Thu Mar 26, 2009 2:44 pm » Post: #10 » Download Post**

Yeah, can't argue with that! Certainly didn't expect it to be that different.
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Andy.
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