To fit or not to fit - Dynojet

markycee · Post by **markycee** » Mon Oct 03, 2011 10:36 pm

Thinking of dynojetting my VTR at some point this winter. Figured it would be a reasonable project to have a go at this winter. It runs performance pipes already and I would stick a K&N in.
The thing that worries me is that there seems to be so much hit and miss on which kit and worse still the settings to use. Whenever I read threads about jetting they seem to mention stuff like "try this setting and if you get a flat spot change the Blah blah, or use different jet or washer" etc etc.. I recently changed the carbs on my bike due to a choke problem and its a big job on it's own by the time you remove seat, tank, pipes, air box, disconnect coolant etc etc. That lot's before you even start stripping carbs down. So how do rolling roads rejet and tune carbs on these things? Do they really have to do all this sh1t between every needle setting or change??
When you buy a jet kit, is there a setting that guarantees it will be 99% and the rest is just a tweek on mixtures screws etc??
Assuming I end up talking myself out of this! Anyone know a good place or someone who could just tune and balance my existing carbs. I'm Heathrow neck of the woods?

Wicky · Post by **Wicky** » Mon Oct 03, 2011 10:47 pm

A decade ago got a good deal on a dyno kit & K&N , bought Micron Race Cans - 8 dyno runs later with a carb guru and Â£250 lighter I've not had to touch the set up apart from clean and re-oil the K&N and balance the carbs.

tinysmall · Post by **tinysmall** » Mon Oct 03, 2011 11:26 pm

If you are going to buy a jet kit, please just bite the bullet and take it to a reputable dyno operator who has experience with these bikes. There are people who don't mind sorting it out themselves but it takes a long time and a lot of faffing about. Getting it set up properly will pay dividends. When I had mine done I saw boosts in the midrange of 10-15 bhp and similar on the torque curve, just purely through smoothing out the fueling. To get though, nearly half the jet kit ended up being binned and they used some of their spares. Each of the two carbs runs on different settings to get the best fueling. But yes, it's worth the money. Mine runs at 107.something bhp and 69 torques. A fair bit above standard and it pulls like a train in the mid range.

gilson · Post by **gilson** » Tue Oct 04, 2011 7:21 am

A company called PDQ performance just near you are reputable.

http://www.pdq1.com/

Serlant · Post by **Serlant** » Mon Oct 10, 2011 12:46 am

my 98 VTR1000 with a dynojet kit, k&n filter and set of unknown pipes, straight through pretty much though, Bike had 46k on at the time...

tony.mon · Post by **tony.mon** » Mon Oct 10, 2011 8:35 am

A bit down, you'd expect 104+ with those on, but with the mileage taken into account not too bad at all.

But that's just a power run; was the fuelling set up when the dynojet kit was installed, or was it just bolted in with the recommended settings?

darkember · Post by **darkember** » Mon Oct 10, 2011 7:37 pm

It seems alot of effort for just a couple of HP gain

tony.mon · Post by **tony.mon** » Mon Oct 10, 2011 8:14 pm

Yes, but coupled with cans and a free-flowing air filter, it's worth it.
Not so much for the hp gain, but for torque, which gains loads.

It feels much better.

But yes, on its own, not much to write home about.

However, you have to start somewhere.....

pariah · Post by **pariah** » Tue Oct 11, 2011 10:10 am

Roger has fitted a dyno kit and set mine up , also has K&N filter fitted . Just wating to see what the difference is going to be when i get back to riding it. According to his invoice it took 20 dyno runs at a cost of Nearly Â£85 quid ?

agentpineapple · Post by **agentpineapple** » Tue Oct 11, 2011 3:01 pm

20 dyno's for Â£85 is cheap mate, having said that the overall cost you paid was high, i just hope the bikes worth it pariah, i hope it puts a smile on your face matey.........

wingman14 · Post by **wingman14** » Mon Oct 17, 2011 9:42 pm

My Storm was running rough and decided to take it to HM Racing of Edenbridge on the advice of Tony Mon (cheers Tony).
I was going to get a dynojet kit fitted but after discussing what I was looking for they advised that they could get a smoother more responsive mid-range without one. They certainly know their stuff and the bike has sacrificed about 2hp form the top end but feels quicker in real terms on the road and much better to ride. It "down" to 100hp at the back wheel now and reached 153 on the rolling road.

Whether you fit a dynojet kit and K&N or not - take the advice of the wise ones and take it to a specialist to be set up.

By the way - don't try a K&N filter with standard jets - it will run like a pig.

Serlant · Post by **Serlant** » Tue Oct 18, 2011 1:58 am

the dynojet kit was already fitted when I bought the bike, but it came with a service history old mots and receipts and dyno runs, kit was fitted on 25/11/2000 and when tuned went from 104 to 109WHP with an increase across the entire revrange, honda service record had stamps on 21/6/00(12000mile service) and 18/4/01(16000mile service) on 11562, and 15,946 miles respectively so if we assume it had 14,000 miles on it, I can live with 7 horsepower in 35,000 miles.

VTR1000.ORG