Super Jet What do you think of these spark plugs?

[icecoled007]

Alright just took my Superjet out for its first full day yesterday. I just rebuilt both carbs and put new spark plugs. Went out and ran about a gallon through it, spark plugs came back white. I loosened up the low speed and tried again, sparkplugs came back a darker white. I then loosened the low speed all the way the adjuster knob would allow (1/2 turn?) and it came back looking like this (see pictures).

What do you guys think? I tried to get the best pictures, the look grey... not tan or white.

These are brand new spark plugs with exactly 5 gallons ran through them. Are they too new to tell much? What adjustments would you reccomend going from here.

My superjet is 100% stock, running at 5280 elecation. I am using Pennzoil Marine Premium PLus 2-cycle oil and 85 octane fuel (regular grade) http://www.ruralking.com/marine-premium-2-cycle-32-oz.html?utm_medium=google&utm_source=cse&cvsfa=1908&cvsfe=2&cvsfhu=303234363930303134

 

[kevbo]

Looking at your plugs is a waste of time. Tune part throttle by sound and response, tune full throttle for peak power. Over time the plugs will become some shade of brown.

 

[D-Roc]

if your running a stock ski why are you changing the carb adj.?, for the elevation? they "should" be a tan brown. not a dry white or dry/wet black. check your piston wash.

 

[icecoled007]

if your running a stock ski why are you changing the carb adj.?, for the elevation? they "should" be a tan brown. not a dry white or dry/wet black. check your piston wash.

It was dieing right out of idol. It hesitated on the low end.

 

[D-Roc]

to read plugs one usually does a plug chop, it won't tell you anything about your off idle hesitation but i am thinking your going to be lowering your pop off.

 

[McDog]

Why are you running br7es plugs?

 

[icecoled007]

Why are you running br7es plugs?

Opps I didnt know, thanks. Put some HS's in now.

 

[jetski9010]

If you put the HS's in there and its still hesitating when you open the throttle your going to have to open your low speed screws some more or lower the pop off. If you still have those stock caps on the screws that only let you turn the screws about a half of turn you have to remove them first so that you can turn the screws wherever you need them. If you have the fine thread low speed screws you can usally turn them out to about 3 turns if you have the course thread screws its around 1 1/2 turns if you need to turn it out more then that to get rid of the hesatation then you need to run the next size up low jet or lower your pop off.

 

[aramis]

why the #7 plug? Hotter (assuming those are NGK plugs) due to elevation?

 

[icecoled007]

why the #7 plug? Hotter (assuming those are NGK plugs) due to elevation?

#7 is what the stock SJ calls for...

 

[gageski101]

mine calls for b7hs. arent br7hs the same?

 

[D-Roc]

resistor and non resistor. i am pretty sure the oem caps have resistors in them. so you don't need resistor plugs

 

[crazy4sand]

My personal opinon Alawys run premium gas in any kind of small engine the extra few bucks wont kill u.. and quality gas cheveron or shell ... run the crappy gas in ur car

 

[D-Roc]

try some b7hs plugs.

 

[aramis]

hmmm...every service manual I have says #8 plug. As far as I knew, the stock plug was a #8 up until the '08 model year when they changed it to a #7. Maybe I'm wrong...

 

[Buckwild12]

I've always used 8's and use non resistor plugs with stock ignition, resistor plugs with aftermarket ignition. Always make sure you check for proper plug gap NGK plugs come gapped too wide out of the box!

 

[Endo]

On a stock head how close due the es's get to the top of the piston? maybe I missed something?

 

[5810]

On a stock head how close due the es's get to the top of the piston? maybe I missed something?

close very close, i ran some es in stock head and had the piston close the gaps when i motor ingested water lol:silly:

 

[sjetrider]

I cannot tune by looking at plugs, too many variables there. Tune by feel. If this boat is completely stock then I cant imagine it would be tough to do that. If you are at high altittude then I assume your tuning for that reason. PM RMBFREERIDE and see what he recomends or someone else in your area. I recomend increasing compression to start with, milled head or aftermarket head with interchangable domes. From what I hear a stock SJ will run like crap at high altittude do to lower compression.