STX-1100 and Flame arrestor mods

[Paul/Sherrie]

If I change the stock flame arrestors to an aftermarket brand what type of
performance increase (if any) will there be. Anyone who has done this?
Will I need to rejet the carbs? Any info or advice please

[ZXiMan]

Depending on the year of your 1100STX or ZXi watercraft and if If
you have stock carbs, the best "overall" combination we've tested is the Triton
Engineering velocity stacks with K&N's. Only the Evolution Marine system out
performed it, but is a pain in the butt to get to the tuning screws on the
carbs and much more expensive. During initial testing back in 1997, the
Triton/K&N set-up was worth 3.6hp and a solid .89 mph (average of 6 runs) on
the Stalker radar gun. These tests were performed with NON CV carbs with stock
jetting (only the carb screws were adjusted) and the accelerator pumps were
active. Test vehicle also had a higher compression head using pump gas. Other
flame arresters tested during this time were the R&D, Ocean Pro, Vilder, Prok,
Jetinetics, Evolution Marine, and standard K&N's with short stacks....

James Crone
Performance Engineering
http://www.Performance-Eng.com
940-321-5865

[Dave]

I recently installed the Triton Engineering Velocity Stacks on my 1998 ZXi 1100. I
also used TauCeti REC 2 filters on top (they fit perfectly). I immediately noticed
a nice increase in the pull between midrange and top end. However, I also noticed
a huge increase in the bog I experience when I open the throttle fast at low RPMs.
Even with the stock F/A the ZXi has some bog/hesitation when pulling the throttle
open quickly at low RPMs (almost threw me over the bars once trying to get away
from an oncoming wave). At times, it almost died when I hit the throttle with the
modified stacks and filters installed. Looks like I need to turn those carb screws
a bit!!!

Anyone have any suggestions to decrease the bog in this situation?

Also, I notice some water spray gets in the hull. In real heavy chop/ocean
conditions, I believe the TauCeti filters were sucking in some water vapor (not a
good situation). Any suggestions for a filter spray/oil or different filter that
keeps water vapor out?

Dave
sen...@iname.com

[sxi...@my-deja.com]

I just installed aftermarket flame arrestors (Worx Power Cones) on my
1999 SXI Pro (dual 40 Mikunis). I did have to rejet my carbs as low
and midrange performance sucked. I changed the stock 67.5 low speed
jets to 72.5. I am also going to bump up my high speed jetting one if
not two sizes. Don't know if this dual information will help you on
your triples, but it might give you a starting point. Additionally, I
am riding at 2500 feet.

SXI

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[ZXiMan]

Dave,

Unfortunately you don't have external adjustement screws on your CV
equipped '98 ZXi.... You won't like the alternative (getting pre '98 Keihins
and sending them to Mega-Flow)

[WSteph007]

yes it will give you a performance increase and you will have to rejet the
carbs. also, recommend installing an primer kit (remove the choke butterflies
and shafts. i used an r&d intake and any primer kit for keihin carbs will work
email if you need more info
ws

[sxi...@my-deja.com]

Install larger low speed jetting. Maybe 2-3 sizes larger than stock
depending on altitude. Also bump up the high speed jet 1-2 sizes. See
my other message in this thread.

[Dave]

James,

Thanks for the info! The dealer sold me a 97 shop manual and I didn't realize
the CV carbs had no adjustments! I can imagine the pre-98 carbs and mega-flow
mods will cost some $$$. I guess I am going to have to live with the bog for a
while. Now, I just don't know whether to stay with the stock F/A, or go back to
the velocity stacks with Tauceti filters? The stacks feel nice in the mid to
high range but make the bogging even worse! Any suggestions?

Dave
sen...@iname.com

[Dave]

Ok, I am confused....

Can I rejet the the 98 CV carbs? Or, do I need to purchase pre-98 carbs and get
them modified? The two messages below gave me different impressions....
- I have a 98 ZXi 1100.
- I already have primers installed.

Dave

---[ MESSAGE #1 ]---

WSteph007 wrote:

---[ MESSAGE #2 ]---

[Jeff Bemis]

you had better expand your water box for increased flow. doubtful you need to
rejet unless you increased your ports.

jb

[Jeff Bemis]

i could see the rejetting if you were adding a pipe or re porting. flame
arrestors???
you must be a shop mechanic or have too much money.

jb

sxi...@my-deja.com wrote:

> I just installed aftermarket flame arrestors (Worx Power Cones) on my
> 1999 SXI Pro (dual 40 Mikunis). I did have to rejet my carbs as low
> and midrange performance sucked. I changed the stock 67.5 low speed
> jets to 72.5. I am also going to bump up my high speed jetting one if
> not two sizes. Don't know if this dual information will help you on
> your triples, but it might give you a starting point. Additionally, I
> am riding at 2500 feet.
>
> SXI
>