Jets/Shims

alan · Post by **alan** » Tue Nov 28, 2006 12:51 pm

Is it possible to buy different size jets and the shims instead of a jet kit im really being a tight butt so i dont have to buy a jet kit as my bike has maxed me out.

im presuming i need 185 & 190 size jets according to instructions i have from dyno jet if using a k & n and aftermarket exhausts plus i will have slightly modified headers.

Also i wont have the slide drill jig you get with a jet kit so i wont know where to drill the slide correctly any advice greatly appreciated.

Pete.L · Post by **Pete.L** » Wed Nov 29, 2006 8:15 am

Hi Alan,
yes you can buy jets individually. Personaly I think it's a better option to use your original needles and just shim them with a s/steel washers cause they have a better finish on them and the Dyno jet needles have been known to wear the carbs prematurely(if thet do that it means new carbs). The easyest option would be to pop it down to your local tuners and let them sort out some sizes for you. The K&N jet numbers don't always corrispond with other manufactures I believe. I'll see if I've still got a pic with diamentions for drilling the slider if you like.

Pete.l

Squiffythewombat · Post by **Squiffythewombat** » Wed Nov 29, 2006 9:50 am

Pete.L wrote: The K&N jet numbers don't always corrispond with other manufactures I believe.

This is certainly true, i remmber in the suzy garage we had loads of problems getting the K&N gixer kits to match!

alan · Post by **alan** » Wed Nov 29, 2006 12:27 pm

It says on the dyno jet kit if you are using a k & n plus after market pipe you should go up 2 size bigger than the jets what are installed if i have read it right.

Instead of a dj kit there is factory pro kit what some of the us guys may its worth searching on there.

thanks Pete & Toby

Stormin Ben · Post by **Stormin Ben** » Wed Nov 29, 2006 12:49 pm

Alan,

The BEST advice is call Roger on 07970 915259

He'll be more than happy to chatter away regarding jet sizes, drilling carbs etc and if you tell him exactly what modifications you're running with he'll most probably look up in his big book of past experiences and give you a 99% perfect setup

Kitch · Post by **Kitch** » Wed Nov 29, 2006 8:17 pm

Apparently, the US guys on the superhawk forum swear by actually decreasing the jet sizes from standard.

Gives massively improved economy for an unnoticeble power drop.

Dunno 100% if the US version has different carbs than UK, but I wouldn't think so, they have that exhaust blanking plate to fiddle their output.

Stormin Ben · Post by **Stormin Ben** » Wed Nov 29, 2006 11:51 pm

Kitch,
That WOULD be right for standard air filter, coz the engine runs quite rich as standard
However, when fitting a freer flowing filter and less restrictive exhaust you would DEFINITELY need to richen it up

Pete.L · Post by **Pete.L** » Thu Nov 30, 2006 12:02 pm

I had a Laser Duo tech system on my Storm
it was road legal with removable baffles.
When I fitted the K&N filter and Dynojets I had to drop from a Honda 185 to a Dyno jet 170 main. And I still got an extra 3 bhp across the range. Just because the diameter is different it doesn't mean they flow less they also go deeper into the float bowl.

Pete.l

Styler4077 · Post by **Styler4077** » Thu Nov 30, 2006 10:57 pm

My two pence worth.

I have to agree with Pete.

I'd go so far as to say â€œNo way do you want to go up a jet sizeâ€

On my dyno, the majority of road bike the riders add a can and by default increase the richness of the bike.

Fit a free flow can and a performance filter to balance the in and out.

Then come down at least one step on the mains. Going up would richer the mixture, decrease the power and drop the fuel consumption.

I have seen one VTR with a 170 in the frony and a 175 in the back as the owner thought it ran better and the fact that the rear cylinder ran hotterâ€¦.

styler

Post by **sirch345** » Fri Dec 01, 2006 12:05 pm

Styler4077 wrote: I have seen one VTR with a 170 in the frony and a 175 in the back as the owner thought it ran better and the fact that the rear cylinder ran hotter….

styler

You reminded me of this:-

http://www.roadracers.co.uk/vtr.htm

Styler4077 · Post by **Styler4077** » Sat Dec 02, 2006 10:52 am

Thats him.

Nice web site.

How about a VTR URL list like the Birthday list?

styler

Post by **sirch345** » Sat Dec 02, 2006 1:51 pm

Styler4077 wrote:Thats him.

Nice web site.

How about a VTR URL list like the Birthday list?

styler

That sounds like a good idea to me

We could make it a sticky and have different categories depending on what each site represents IE tuning, tyres, suspension, bodywork, paintwork, exhausts etc etc

Kaz and Cuppa whats your opinions

alan · Post by **alan** » Mon Dec 04, 2006 4:40 pm

Just had a qoute for a factory pro jet kit from Straightline racing following the bad comments and research i did with the dyno jet kit being difficult to tune and setup with a k & n anyway 90 quid including postage where do they get these prices from?????

Post by **sirch345** » Mon Dec 04, 2006 5:12 pm

Â£90