K & N filter plus Dynojet for SRX600?

[g80cs]

I'm thinking of getting K&N filter and Dynojet kit for my SRX600. I've read elsewhere that the Dynojet kit is way overpriced for a few jets. Anyone got experience or opinions? Thanks Rob

[Ken]

I have just fitted a dynojet kit to my Dominator. I bought mine from Ebay. You will find them listed to fit most bikes. I Think I saved about £15.00. There are a few parts in the kit you wont use so you could buy the parts required if you know someone who had a kit and can give the numbers. I found it made my  bike much smoother to ride. No increase in top speed. I don't have  K & N  but fitting a good aftermarket exhaust made  a difference to power.
Ken

[themoudie]

Aye Rob,

Have K&N air filter and found that fine. Bought K&N for Gert my first SRX and DynoJet but never fitted it before selling the bike. Sold it to in the TC, sorry I can't remember who. Sally runs with K&N, standard carbs and BSM system with short (30cm) Futura road can, seems fine. Yes, the price increased by 50% after I bought the DynoJet kit and for a drill, jet and instructions new price seems steep.

Regards, Bill

[peterj]

My experience with trying K&N filter element and a number of different cans on my SRX whilst the motor was still stock suggests that there is no way a single dynojet size can suit all setups.

If you want to try the dynojet road first without the expense, I'm pretty sure a guy called Jhop, who posts here from time to time, has the sizes you need - have a look in the archives perhaps? It may have been on the US Thumperpage that hasn't recovered fully from being hacked to death (it is up and running again btw).

You can buy the drills individually from

http://www.maccmodels.co.uk/drillsnum.htm

If you want to do the job properly, you really need to dyno it and try a variety of sizes. I got a reasonable sized set of drills off Aus Ebay for about 10 quid to do mine after doing the motor and pipe. If you go too big, just fill it with araldite or solder and start again.

[Ken]

If you are thinking of drilling jets beware. Dynojet claim their jet sizes are not metric sizes but unique to them. Also the needle is special. With the NX650 kit you also get a shield that goes in the venturi to help atomise the fuel.  Don't forget the float height. That will make a big difference.

Ken

[guest27]

I am sure the comments are correct - but despite dynojets claim I am betting that the drill bits are commercially available not unique to them.  When I was a turner we covered imperial and metric, numbers and letters.  Had most drills between 1/64 and 1/2 inch in 1/64 increments, most metric between .5mm and 13mm in .1mm steps, then the letters and numbers fill in the gaps.  If it does seem to be a funny size drill - take a look in a Zeus Engineers pocket book - you may well find it is a standard size anyway.

R

[peterj]

From info posted before the SRX dynojet kit consists of two jet drills, one is numbered and the other a fractional imperial (if my memory is correct). Certainly both converted to within .02 mm of drills in my limited metric jet drill set. You would get more mixture variation with altitude and weather changes than with that sort of jetting difference.

As far as needles go, I ended up filing a small flat in the primary carb needle to get mine close to right (tip from an ancient Mini tuners article), but that was after the piston and cam were upgraded. I believe that in most cases a stock engined SRX is not going to need a special needle.

When mine was stock engine wise, I tried three pipes on it (none designed for an SRX mind) and the required jetting was substantially different in each case. I just cannot see how one dynojet setup can cope with all available combinations of pipe and filter. Now if they were to publish which pipe and filter they set up for, it would at least be a good start point, but AFAIK they don't even do that.