Hello Guest User,

Please feel free to have a look around the forum but be aware that as an unregistered guest you can't see all of it and you can't post.

To access these 'Registered Users Only' areas simply register and login.

JET SIZES

Need help restoring, building, or finding then try here.

Moderators: KeithZ1R, chrisu, paul doran, Taffus

Message
Author
blackdog3

JET SIZES

#1 PostAuthor: blackdog3 » Fri Feb 12, 2010 9:09 pm

changed a gpz1100a2 to carbs . got a std filter,cobra pipe ,no baffles. any ideas on jet sizes. cheers

User avatar
Pigford
Hardcore
Hardcore
Posts: 13314
Joined: 2nd Jan 2006
Location: North Dorset

#2 PostAuthor: Pigford » Fri Feb 12, 2010 10:14 pm

If they're std older GPz1100 carbs (BS34), the mains are approx 125, so with an open pipe start at 130 :wink:
And on the 7th day... Zeds were created!

blackdog3

JET SIZES

#3 PostAuthor: blackdog3 » Sat Feb 13, 2010 9:25 pm

the carbs are off a z1000 j2

nanno
100Club
100Club
Posts: 375
Joined: 17th Jan 2008

#4 PostAuthor: nanno » Tue Feb 16, 2010 8:13 am

130 - 135

I am running 135s on my Z1000J and it seems to work reasonably well.

Greg
There's no replacement for displacement!

dimble

#5 PostAuthor: dimble » Wed Feb 17, 2010 9:04 am

Interesting question. Not sure about my english here, but what about the idle jets and screws...? :?? thanks

kev edwards
Hardcore
Hardcore
Posts: 1487
Joined: 3rd Apr 2009
Location: leverington UK

#6 PostAuthor: kev edwards » Wed Feb 17, 2010 9:27 am

An f4 Phantom is quite big :)

User avatar
Pigford
Hardcore
Hardcore
Posts: 13314
Joined: 2nd Jan 2006
Location: North Dorset

#7 PostAuthor: Pigford » Wed Feb 17, 2010 10:08 am

dimble wrote:Interesting question. Not sure about my english here, but what about the idle jets and screws...? :?? thanks


Pilot jets may need to go up a size (eg: from 17.5 to 20) and th air screw will just need to be fine tuned :wink:
And on the 7th day... Zeds were created!

dimble

#8 PostAuthor: dimble » Thu Feb 18, 2010 12:47 pm

Ok pilot jet and not idle ...thanks for the lesson :)

How to fine tune the air screws. Someone told me about pointing each exhaust and measure the temp and adjust...Do you have a simpler method? :wink:

User avatar
Al
Hardcore
Hardcore
Posts: 2233
Joined: 21st Oct 2007
Location: Farnbronx Sin City N.E. Hants

#9 PostAuthor: Al » Thu Feb 18, 2010 5:01 pm

You could do worse than buy these to set up the carbs and in particular the 'air' (fuel) screws.

http://www.ekmpowershop20.com/ekmps/sho ... s-25-p.asp

This is a special offer which saves a few quid!

As a general guide to setting up the rest and interpreting what you get with the above mentioned you might follow this.

http://www.mikuni.com/fs-tuning_guide.html

Someone told me about pointing each exhaust and measure the temp and adjust...


Do you mean painting the exhausts??
You can tell a lot about initial temperature gains by putting candle wax on the uppermost exhaust stud of each cylinder and seeing which come up first and of course last.
Also useful if youve got a cylinder down and dont want to burn youre hands.

AL
1981 J1

dimble

#10 PostAuthor: dimble » Fri Feb 19, 2010 6:23 am

i was thinking paint :oops: but pointing each exhaust with a laser temp meter...


Return to “Bike Help”

Who is online

Users browsing this forum: No registered users and 15 guests