Re jetting

[scott02464]

Great! I'm off now for four days after tonight so I'm hoping to have a play :-) :-)

Your Filter is picked up tomorrow mate will keep you informed with tracking etc, enjoy playing and tinkering, i will take pics tomorrow of how i manage to do quick sharp mixture screw adjustments if i decide to adjust it quarter of a turn

Thanks a lot fella that's great! ;-)

I was just reading your other thread where you said your carbs had brown marks at the bottom after 40k and 12 years! Mines the same 39k and 12 years so I'm expecting the same ;-)

[VTRDark]

Bet they weren't as bad as this.

It's like my lungs.


(:-})

[scott02464]

Bet they weren't as bad as this.

It's like my lungs.


(:-})

Holy moly! Never thought they could get as bad as that when used regular?

[VTRDark]

That was my second hand carbs I bought on ebay. They were spotless on the outside. I doubt those carbs were used much. With the main jet blocked like that I don't think it would have run well at all.

(:-})

[lloydie]

Bet they weren't as bad as this.

It's like my lungs.


(:-})

i know you like smoking around your carbs but thats a bad habit

[VTRDark]

A few of links for purchasing Keihin jets.

http://www.jetsrus.com/a_jet_kit_street ... r_hawk.htm

http://bikejets.com/honda-vtr1000f-1998-2005.html

http://www.pjmotorsports.com/keihin-jet ... ain%20jets

I will try and find some UK sites and add them here.

http://www.allensperformance.co.uk/keihinjets.html

http://www.motorcycleproducts.co.uk/cat ... b658c3625a

http://www.ebay.co.uk/itm/BRASS-MAIN-JE ... 336a69f2ff

http://www.ebay.co.uk/itm/130484446234? ... 1423.l2649

(:-})

[seb421]

Got my self one of these for future use, used the Mum's card as its stored with Amazon, hopefully she wont notice and i can pay her back on Thursday

looks like a shaft with a cable inside, sure you could make one if you was good at that stuff but i'm not...

http://www.amazon.co.uk/Sealey-Pilot-Sc ... 238&sr=8-3

[VTRDark]

Apparently they do fit and work. One of the lads had one at the workshop day. I did not try it. But looking at it I can't see how it will fit. where the right angle bend is I think (now don't quote me on it as like I say I did not try) there is too much depth. Here's review http://www.motorcyclecruiser.com/access ... index.html

I already own one of these
from Carbtune and that don't quite fit. There is so little clearance on these bikes.

So I now have one of these on order from Motion pro which has a click type handle that turns in 1/16 increments and a very shallow gear driven depth.

http://www.motionpro.com/motorcycle/partno/08-0229/

here's the specs
Motion pro 90 degree carb tool with bits

Precision made of aircraft grade aluminum & stainless steel
Designed for hard-to-reach areas and air/fuel mixture screws on multi-cylinder motorcycles
Gear driven 1/4 in. hex drive
Includes five 1/4 in. hex drive bits (all 1/2 in. long) - Straight-slot, Phillips, D-shaped air/fuel mixture screw bit, 6mm hex jet bit & 1/4 in.-hex-to-1/4 in.-drive bit
Can be used with any 1/4 in. or 6mm hex bits
Strongest tool of its type on the market
Max torque is 60 in. lbs.
17.5 in. long
Replaceable drive gears
Limited 1-year warranty





I am so looking forward to getting it.

(:-})

[scott02464]

Don't forget the keihin jet sizing is different from Dynojet don't compare them both. This is why the Factory pro jet is easier to set up because they use the same scales as Keihin.

If your going to buy Keihin jets make sure they are the right ones for the carbs, IIRC 6mm thread keihin jets. I will try and find a link later for you.

I would try Keihn 178 or 180 in the front and either a 180 or 182 in the rear. If you have standard carb set up at the moment then you will have 178 in the rear already so could use that for the front. And the standard front is 175. The rear cylinder uses a slightly larger main to help keep it cool.

Three's no guarantees though. You may even have to go slightly larger on the mains.

(:-})

Thanks for all the links they're very helpfully mate!

Iv been searching for the jets you mentioned in this post '178 or 180 front and 180 or 182 rear'

However I'm struggling to find jets that arnt in numbers of 5 ie, 170, 175, 180.

And seems the largest is 180. Am I asking a daft question again lol :-(

[VTRDark]

IIRC Dynojets step in 5's and the Keihin step in 2's and 3's what I have said regarding jet size for you bike is an estimated guess as I don't know your bike, altitude etc, so just get something close to it. A lot of jetting is trial and error by either seat of your pants tuning or putting the bike on a dyno to see how things are. Ideally you should purchase a small selection of jets to play with. Just make sure they are for the VTR, it's very easy to purchase the wrong size. IIRC I think they are Keihin Series 21, with 6mm thread.

According to the Factory Pro instructions/guidance with stock/quite aftermarket pipes try a range of jets between 172 and 178.

With competition exhaust, so race pipes no baffles try a range between 178 and 185.

If using a BMC or K&N filter then add an additional 2 jet sizes to the above. So if you had a stock filter with race cans and a 180 main worked for you, then you were to put a K&N in, then you would have to replace the 180 with a 182.

The Factory Pro kit supplies 172,180,182,185, and 188 to play with. You also have the stock 175 and 178.

Try to keep the rear cylinder about 3 jet sizes above the front as with the stock set up. You must be really confused now I hope it's all starting to make sense to you. I'm sure once you open the carbs up, get to know them and start experimenting it will all come together.

You most probably wont get it right on the first go unless your lucky/fluke so be prepared to take you carbs on and off a few times.

(:-})

[scott02464]

IIRC Dynojets step in 5's and the Keihin step in 2's and 3's what I have said regarding jet size for you bike is an estimated guess as I don't know your bike, altitude etc, so just get something close to it. A lot of jetting is trial and error by either seat of your pants tuning or putting the bike on a dyno to see how things are. Ideally you should purchase a small selection of jets to play with. Just make sure they are for the VTR, it's very easy to purchase the wrong size. IIRC I think they are Keihin Series 21, with 6mm thread.

According to the Factory Pro instructions/guidance with stock/quite aftermarket pipes try a range of jets between 172 and 178.

With competition exhaust, so race pipes no baffles try a range between 178 and 185.

If using a BMC or K&N filter then add an additional 2 jet sizes to the above. So if you had a stock filter with race cans and a 180 main worked for you, then you were to put a K&N in, then you would have to replace the 180 with a 182.

The Factory Pro kit supplies 172,180,182,185, and 188 to play with. You also have the stock 175 and 178.

Try to keep the rear cylinder about 3 jet sizes above the front as with the stock set up. You must be really confused now I hope it's all starting to make sense to you. I'm sure once you open the carbs up, get to know them and start experimenting it will all come together.

You most probably wont get it right on the first go unless your lucky/fluke so be prepared to take you carbs on and off a few times.

(:-})

No mate that's much clearer thanks very much! Thanks for being patient but it's finally sunk in lol!

Iv got loads to go at there, I just need to do it now. I bought a tin of carb cleaner today so all go to get stripping (naughty) ;-) :-)

[VTRDark]

Excellent pleased to hear it

Be careful with the carb spray, it's got some nasty chemicals in it. You wouldn't want to get it on you knob, it's bad enough on the hands. Try not to over soak the rubber seals (float chamber gasket) I had one wear out with the carb spray. Some brands are stronger than others.

(:-})

[scott02464]

Excellent pleased to hear it

Be careful with the carb spray, it's got some nasty chemicals in it. You wouldn't want to get it on you knob,

Sound mate, I'll spray some on next door naybers tomatoes then and go for a sit down piss

[scott02464]

So iv put the K&N filter in!

Iv put larger mains in and shimmed the needles.... Resulting in a definate increase in power above 7K.
But if im at or below 3K the snap the throttle wide open there is a bit of hesitence (And a bit flat) until it gets to and around 7K then really picks up.

This is what the settings wer and what iv changed,

Front main - was 175 and is now 180. Mixture was 1 turn out and is now 2 1/2 turns out
Rear main - was 178 and is now 185. Miwture was 1 1/8 turns out and now is 2 1/2 turns out.

I have put 1 brass shim/washer under each needle aprox 1mm thick as well as the standard washer.

Im going to read the 'tuning guide' i have saved on here to get rid of the low end flat/hesitence, but do you have any sugestions from what iv done so far?

TBH its not left me with a massive grin, iv lost the bottom end boot up the butt ha

[VTRDark]

A bit flat = too rich

I would try a half turn ish back in on the mixture screws to lean it out first. See how it feels then. So maybe I'm guessing 2 on the front and 2 1/4 rear Also did you do a carb sync after changing things.

And if your still not happy, mains could be a bit rich. But you wont know if it's better or worse until you try.
On the mains drop down to 178 front and 180 rear. But don't do this until you have played with the mixture setting. I would be tempted to remove the 1 shim from the front carb as well.

(:-})