Tell me about Dynojet kits

[Papa Lazarou]

I picked up one cheapo for the Triumph Thunderbird (still awaiting repair for the accident damage  ).

I'm not entirely sure much would be gained by fitting it and it requires an irreverisble mod to the carebs-drilling a hole.

Thoughts?

[HanksXXX]

I haven't had much luck with their kits and prefer Factory Pro if available.

[zer0netgain]

I picked up one cheapo for the Triumph Thunderbird (still awaiting repair for the accident damage  ).

I'm not entirely sure much would be gained by fitting it and it requires an irreverisble mod to the carebs-drilling a hole.

Thoughts?

It's been a while, but as you know, these kits let you "tune" a carburetor setup for specific local factors and desired outcomes (more horsepower being the main goal).

A good kit should come with the parts needed for your area (2-3 jet sizes).  As far as drilling a hole, I think the "hole" is really just to access a carb adjustment screw you normally would never touch.

Last time I did one (a decade ago), I was wondering what I'd have to drill out, but I think it turned out someone already put a kit on the bike, and I wound up just changing out parts.

[bomber]

I have had very good luck with their kits . . . I'm not sure about in Merry Olde, but here in the states, carbed bike kept getting leaner and leaner to suit the regs -- some, to the point of being impossible to ride when cold, and having low throttle grumpitudes . . . I installed dynojet kits in a number of bikes, and felt it worth the monehy and time in all cases.

[Bowtie76]

I'm guessing the whole is in the bottom of the needle slide.  

It results in quicker throttle response.  Not something that you have to do.  Try the new jets and needle.  You can change the slider spring or drill the hole in the slide latter if you feel it is necessary.

[ConPilot1]

I had a stage ll in a Kwak aircooled i4 ZR750. Damn thing ran like a bastard.
Really quick with a great throttle. There were no flat spots in the RPM range at all.

[tomek]

It's been a while, but as you know, these kits let you "tune" a carburetor setup for specific local factors and desired outcomes (more horsepower being the main goal).

A good kit should come with the parts needed for your area (2-3 jet sizes).  As far as drilling a hole, I think the "hole" is really just to access a carb adjustment screw you normally would never touch.

Last time I did one (a decade ago), I was wondering what I'd have to drill out, but I think it turned out someone already put a kit on the bike, and I wound up just changing out parts.

You are clueless , as usual I might add .

Some kits require drilling , or rather enlarging the hole in the slide , it quickens  reaction to the throttle .

Dynojet kits tend  to be on rather rich , safe  side   . I`ve always ended up with smaller then they recommend main jet . Other then that they are O.K.

[Kraz]

DJ kits seem to be hit and miss, depending on the bike it's for.  

Sometimes all you need is to adjust the needle, sometimes a new needle and multiple jets are req'd.  Bike specific forums seem have the inside gouge on whether it's the best kit for your bike or not.

[bomber]

btw, the drilling MAY be simply removing the cover from the low-speed adjustable jet . . . . .

[zer0netgain]

btw, the drilling MAY be simply removing the cover from the low-speed adjustable jet . . . . .

That was my situation.

[Papa Lazarou]

DJ kits seem to be hit and miss, depending on the bike it's for.  

Sometimes all you need is to adjust the needle, sometimes a new needle and multiple jets are req'd.  Bike specific forums seem have the inside gouge on whether it's the best kit for your bike or not.

Sadly, Triumphrat is worse than useless on this one

[ConPilot1]

I've heard also to get the kits with the titanium jets. The brass ones tend to go oval shaped over time.

[fossil]

I've had good luck with Dynojet. Hands down best service ever was from Holeshot perfomance when I had a 98 Bandit1200. Called with a question and ended up talking directly to Dale Walker...

[lj516]

I have gotten my Jet kits from Ivans performance parts and they are amazing. He does tons of testing and makes all of his own needles with several levels of taper on them. You can call him and get either him or his son who are very willing to help everyone.

[Papa Lazarou]

Ta.

Anybody want to buy a brand new stage one dyno jet kit for a Tbird?

[Drif10]

I haven't had much luck with their kits and prefer Factory Pro if available.

Same here.

As for drilling the slide: You can do it without worry. If it doesn't work out for you, you can simply fill the hole with epoxy. Once it's dry, you then just re-drill it to the original diameter.Done it a few times.

Another thing about the DJ kits: They use their own proprietary jet sizes, so it doesn't correspond with the oem original sizes. This means that if you need to go outside of the range they provided, you have to buy the new jets from them. That, or start using your numbered drill set to figure out which sizes you have, then figure out which oem jets you need and buy those from your local shop. PITA.