View Full Version : throwing Flames out exhaust

Eric Black
01-07-2007, 08:48 AM
I just redid my engine on my 97 750 Kat . I change it to a 816 as they call it and re did the head and the vavles. I also put a factory pro advance on it an put K&N pods on it the shop I go to said that I should run a 144 size jet but I think that is to big . It starts up fine but i'm throwing blue flames out about foot or so when it's running. Should I go down in jet size or should I change the air mixer screw. I have different jets . If someone can help me I would be great full. I forgot I'm also running a D&D show an go exhaust on it.

01-07-2007, 01:45 PM
Wow Blue Flames....some people pay money to get that effect...they make a kit that will allow you to do that but your's is stock doing it...I say get a passenger with a wire hanger and a bag of marshmellows and you'll be set...:lol:

Seriously I just wanted to post so that your thread would be sent back to the top and maybe someone with more experience than me could help you out...

Got any pics of your problem? Would like to see it...:bigthumb

The CyberPoet
01-07-2007, 03:27 PM
Did you just change jets, or did you install a full stage 3 jetkit?
Scratch that -- there is no stage 3 for the 98+ Kats

Also: did you change your exhaust at all, or is it still the stock 750 exhaust?

Here's probably what you need:
Adjustable full stage 1 kit.
Aftermarket headers, AND/OR scrap the pods
About 2 hours on a dyno-machine with exhaust gas analyzer.

Good Luck!
=-= The CyberPoet

01-07-2007, 04:17 PM
Flames ? NICE!!!! I wish mine did that. COOL

Special K
01-07-2007, 07:44 PM
CP: He said at the very end he is running a D&D........
Also, pretty sure there IS a Stage 3 kit out there..........if not, the only real difference is the jets they include in each kit.

Definitely too rich....................lean it out.

Check your floats - make sure they are set at the proper height. I think its 12mm, but check the manual. (It's gotta be more accurate than my crappy memory! :lol: )

Set the A/F screws to 2.5 turns out from dead stop.

Synch carbs FOR SURE!

I agree on the dyno with EGA - they only way to go with your set up, for sure!

01-07-2007, 08:03 PM
That is cool! The blue flames would match my Blue Kat! :P

The CyberPoet
01-07-2007, 10:31 PM
I must have either misread it, or he corrected his original post to change the model year (from 98 to 97). Yes, there are stage 3 kits for the 97 Kats from FactoryPro (the one I would recommend) and from DynoJet.

And I wasn't sure if the comment on the D&D was muffler only or full exhaust (headers+muffler) set-up.

=-= The CyberPoet

01-07-2007, 10:40 PM
CP it would have to be a full system, if it were slip-ons on a 97 there would be two of them. I'm pretty sure since D&D and V&H are the only companies that make 4 into 1 ehxaust systems for the pres it is a full exhaust.

01-10-2007, 05:31 PM
maybe check your exhaust valve clearances. they could be slightly open when motor is ignighting the fuel. does it backfire?