Dynojetting?

[Tom L]

i was recently doing some maths and realised i'm only getting 25-30 MPG out of my bike ('99 VTR) which to me seems pretty poor. I was thinking that perhaps part of the reason is that the guy i bought the bike off stuck some race cans on without adjusting the fueling etc. What would be the advantages in getting the bike set-up properly to run with the non-stock cans. Do i need to buy a full dyno-jet kit or are there cheaper ways as a kit seems to be around £250

[TLS-Moose]

The moreopen pipes might cause the engine to run rough, but is more likely to lean out, rather than richen up, the mixture

as with most big twins Firestorms have a reputation for being thirsty

[GIXXER KID]

i only get 92 to a tank on my 950sm with standard cans, costs about £15 to fill up if thats any help

[Banditmax]

Dynojetting should help you to get more power for a smaller throttle opening therefore reducing your fuel consumption if your lucky. But riding style will dictate what your going to get outve it mpg wise.

[jam]

A Dynojet kit for your bike will be around the £90 mark as it's a twin, setting it up on the dyno will be around £120, if you are going to have it done it would be a good time to fit a K&N filter or similar and have it set up to run with the K&N and the pipes you have, a K&N filter will set you back around £50. You will see a small gain in power at full throttle, a smoother midrange with more power available at smaller throttle openings and your fuel consumption should be a little better.
So £250 is about right for the DJ kit K&N filter and installation and set up. The last VTR Firestorm I fitted a Dynojet kit and set up on my dyno ended up with around 118bhp at full throttle with a midrange increase of around 10 to 15bhp. Upjetting can be done without a DJ kit but the big difference with the Dynojet kit is in the needle profile rather than just bigger main jets, but doesn't always produce significant gains lower down the rev range.

[mattr6]

I used to run a firestorm and as moose says, they do drink petrol!!

[TLS-Moose]

My bike runs rich because it rarely runs hot enough (above 80 dgrees C) to get onto the "normal" map Even so, it usually does about 105 miles from full to flashy light and takes about 13 - 14 litres at that point, or about 35mpg