no piston wash

[bustamove]

getting the sled ready for this year checking everything twice (had it blow up twice) and i have a bore scope and found that there is no piston wash at all just built up carbon. what could be causing this, it looks like its too rich.
i did put fuel stabilizer and fogged the engine but would this cause the piston to have no wash? also there is about a 1inch by 1inch square of scratches on the piston looking thru the y pipe.. is this okay?

mods: slp pipe+can, slp heads. 93 octane /non ethanol gas.

here a really crappy pic can't tell much from it. but ill post it anyways.

 

[Newfusion900]

I may not know much but if you say it looks too rich I would check the oil pump cable, they tend to stick open. Sorry I can't help much past that.

 

[Z-Man]

What Oil?

 

[bustamove]

i do mix a little oil in the tank and running Polaris gold. mixing gas probs did it eh.

 

[Z-Man]

don't think so. Polaris gold in mine and pistons were so clean you could read all the markings on top.

 

[Goinboardin]

No wash would suggest its lean...unless I completely don't understand the concept. If it blew up twice last year I'd figure out why its lean. cracked throttle body boots?

I suppose too rich on oil could cause excessive carbon build up. But if it were too rich on fuel wouldn't the pistons be clean as a whistle?

 

[Z-Man]

Also, if you have not done it already get your injectors cleaned and tested. Witchhunter performance does this.

www.witchhunter.com

 

[Z-Man]

personally I would remove slp pipe and flash too.

 

[94fordguy]

No piston wash = lean condition

Scuffing on faces of pistons = lean condition or cold scoring or possibly out of tolerance piston/cylinder gap

 

[bustamove]

wow thanks for all the reply guys. boots are new checked with no cracks. also brand new injectors as of last year. new reeds, all new gaskets. its basically a completely brand new engine with maybe 300km on it. i wish i could get rid of the slp... damn thing keeps cracking and i keep welding it up.. but it came with the sled when i bought it and i really don't have to money to buy another pipe and can. last year the spark plugs looked good though coco brown. the only thing ive been meaning to buy is the FBF cable set up.

 

[AKSNOWRIDER]

check your fuel filter and your fuel pressure..most likely a plugged filter or weak pump...

 

[bustamove]

will buy a fuel pressure gauge and i change the filter every year with polaris :/ pricey. might switch to the hi- perf ones.

also should i be concerned with this piston scuff?
another ****ty pic but i was too lazy to take the y pipe off

 

[Z-Man]

wow thanks for all the reply guys. boots are new checked with no cracks. also brand new injectors as of last year. new reeds, all new gaskets. its basically a completely brand new engine with maybe 300km on it. i wish i could get rid of the slp... damn thing keeps cracking and i keep welding it up.. but it came with the sled when i bought it and i really don't have to money to buy another pipe and can. last year the spark plugs looked good though coco brown. the only thing ive been meaning to buy is the FBF cable set up.

Where are you at? I have one or two stock pipes laying around somewhere. I am thinking the same thing, that either your fuel pressure is low or you ECU is not putting in enough fuel. If I remember right, I think the SLP flash does actually lean the engine out at certain points in the curve.

I'm also wondering if maybe they flashed the ecu for the wrong color injectors.


Here is what dobeck told me to do to test to see if it was getting enough fuel.
Run it wide open for 20 seconds then hit the kill switch while it is still wide open. Pull the plugs and check them. Speaking of Dobeck, if you put a TFI box on it you could add more fuel to it and that might cure it.

They are on ebay all the time for around 150 and I actually have a new one sitting in my trailer they sent me after mine decided to introduce itself to my primary.

 

[bustamove]

fuel pressure good at 60 PSI idle. stays at 52PSI for 5 to 10min. would the slp head have anything to do with it?

 

[Z-Man]

fuel pressure good at 60 PSI idle. stays at 52PSI for 5 to 10min. would the slp head have anything to do with it?

NO, just requires higher octane. Stock head will actually run on less than 91, it has a built in safety margin. SLP has two dome designs low altitude and high altitude. The high altitude has higher compression. I have them on two sleds.

 

[sleddude]

wow thanks for all the reply guys. boots are new checked with no cracks. also brand new injectors as of last year. new reeds, all new gaskets. its basically a completely brand new engine with maybe 300km on it. i wish i could get rid of the slp... damn thing keeps cracking and i keep welding it up.. but it came with the sled when i bought it and i really don't have to money to buy another pipe and can. last year the spark plugs looked good though coco brown. the only thing ive been meaning to buy is the FBF cable set up.

Maybe the ECU hasn't had the SLP re-flash? Send it to SLP...

 

[Newfusion900]

Maybe the ECU hasn't had the SLP re-flash? Send it to SLP...

I don't think that SLP can flash ECU's. They send the file to polaris and have them do it.

 

[Z-Man]

My vote is still for adding the TFI box so you can add as much fuel as you want.

 

[hdkawi]

Is there on piston wash on one piston or both?

 

[bustamove]

both look identical. i adjust the tps so that it runs slightly rich. haven't had time to test it.