Dynajet carburetor kits

[DarkLord]

Just wondering how many out there have these installed in their bikes, and what your thoughts are on them?

My SV was running horribly rich when I first got it, revs would drop and then suddenly surge forward upon roll on acceleration, fuel economy was appalling (170km on a tank of 98 and the fuel light was on - for a 650 v-twin not even being ridden that hard) and generally ran like a bit of a pig.

I had the dynajet kit installed in January of this year and it now runs far better, no more surging or brown crap coming out of the exhaust, I can now get 350ks out of a tank while taking it easy, so it's been good. Only thing to note is because the carbies run more economically on fuel than before, it tends to reach a lot - especially in lower gears when riding around town. Makes it a bit of a bitch as you have to either ride round 50 zones in 4th or put up with the engine complaining if you leave it in first or second, but overall it's not that much of a big deal.

Keen to hear your thoughts/opinions.

Cheers

DarkLord.

[meteor]

Yip, I got one on the motard. Opened airbox and FMF can. Goes heaps better, havn't used the choke.... ever! Don't know if there is any peformance difference between the JD or Dyno jet kits. I reckoned it physically felt that 2nd has the pull that 1st used to. The pipe is a Q4 so not really any louder just pitchier if that makes sense. Lotsa fun about town and on twisty roads but cruising... nah. Enjoy

[nadroj]

Dynajet needles tend to wear quickly & ovalate the main jet, so don't expect too long a life from them.

[DarkLord]

Cheers guys.

When you say they wear out quickly - how many k's are we talking here?

How can you tell when the jet becomes ovalated?

[nadroj]

Mine started to deteriorate from as little as 6000km with mileage per litre decreasing and fouling plugs when starting. I used to think it was caused by the cams I was running causing flutter of the needles due to the short intake tracts. A tank full could be disposed of in 160KM.

[DarkLord]

Interesting... mine have been in the bike for about 17,000 k's or so and although it can be a bit bitchy whenI start it up, and the throttle sticks every now and then, there is no problem with fuel economy and the sparkies are fine according to the last service I had done on it which was only a few thousand k's ago. When did you get yours installed, nadroj? My bike is a 2001 SV650s, perhaps the dynajet kits have been improved since you had yours put in?

[nadroj]

Yep it's a few years ago now but I went thru 3 sets during the time I had the GSXR1100L. It was running aftermarket cams & 4 into 1.

[meteor]

I've had the Dynojet kit in for ~4000K. Still runs fine. I get about 25km a liter ish. It's only a 400 tho so a few horses and cc less than your 1100.

[gale_wolf]

Similar to nadroj, also been a while for me, but on my GSXR1100K I went through 5 sets of needles (that I can remember, possibly more) while putting 130,000 kms on that bike. No doubt the kits have improved since my time with that bike though.

[DarkLord]

That's an impressive amount of k's!

Any major mechanical problems with that bike, Gale? My SV is beginning to get up there in terms of k's (nearly hitting 80,000) so I'm curious about the longevity of the bike from here on in. Different models, I know, but seeing as they are the same manufacturer it'd be nice to know.

[gale_wolf]

Darklord - I don't have any experience at all with an SV, but certainly never had any major mechanical problems on the 11. Just the usual wear and tear, only had to replace the cam chain and clutch plates (but not both at the same time). It had done 153,000km when I sold it and the engine was still going strong; probably could've done with an overhaul really but the engine was still very reliable, it just didn't have the same get up and go that it used to have.

Apparently the GSXR1100 engines had a reputation for being 'bullet proof', the engine would still be decent long after the rest of the bike had fallen apart around it. Over the years that I owned it I had several different mechanics say the same thing in that regard.