62t/62t SJ tuning w/ FP

[JustinB]

I put a Waveraider engine in my SN along with a FP B1 Mod chamber. This is the same pipe as the Raider pipe, which FP recommends stock jetting for- 130/120 for the main jets, and 67.5 for the pilots. I made the adjustments per the Raider instruction sheet and it seems to run great, but I havent had it on the water yet.

Question is, should I use these same jetting specs for this engine in a SJ? I know the engine load will be less, but how exactly will this affect jetting.

Anyone have a 62t/62t engine in a SJ with a FP have any jetting recommendations?

 

[kevbo]

Don't make any assumptions on carb tuning. Make it fourcycle and lean from there.

 

[JustinB]

Don't make any assumptions on carb tuning. Make it fourcycle and lean from there.

I realize I will have to do some plug reading. I am mainly wondering how engine load affects the jetting. I will be the first to admit that I am terrible in this subject.

Assuming the jetting was spot on while the engine was in the Raider, how does it being put in to a SJ (with stock impeller and single cooling) affect things? I have single cooling at the moment because I am using a stock 64u head.

 

[SXR-FOREVER]

You should be fine with what FP says for jetting! Used it on mine raider motor I put in my SJ and it was pretty damn close, I just had to mess with the screws for a bit to get it perfect.

 

[SUPERTUNE]

Use the stock F/A with all the screens and don't remove the choke plates out of the carbs too.
You might need a bigger low jet. Definitely will if you use a Jetworks flow control valve on the stinger feed.

 

[customride0105]

i dont get this? raider is stock 130, 120, 67.5 when a superjet is 130 130, 70 fp reccomends 135s and 70s i take it cause sjs are running 61x cylinders ?
any one tryed 130 130s and 67.5s on the 62t? whats the point of runnig the mag side? i take it cause carb fuel pump is on the pto?

 

[JustinB]

Use the stock F/A with all the screens and don't remove the choke plates out of the carbs too.
You might need a bigger low jet. Definitely will if you use a Jetworks flow control valve on the stinger feed.

I dont have a flow control valve, but I am using a T that has a reduced diameter on the leg that flows to the stinger. I did leave in the choke plates and drilled the stock FA bottom plate for my primer.

 

[JustinB]

Got it out on the water today to see how it ran. It seems to run great- only thing I am worried about is the headpipe seems to be pretty hot, which leads me to believe it is lean. I never noticed my headpipe on the RN being very hot, but this skis headpipe is so hot you cant hold your hand against it. What kind of temps should I be seeing?