1990 JS440SX

[Okoblowji]

Keep an eye on those battery cables. I got mine from BatteryCablesUSA and the crimps were loose under the heat shrink. One fell off while riding. When I fixed it, I checked the others and ended up crimping and soldering on all new ends.

 

[mrfist9]

Keep an eye on those battery cables. I got mine from BatteryCablesUSA and the crimps were loose under the heat shrink. One fell off while riding. When I fixed it, I checked the others and ended up crimping and soldering on all new ends.

New fear unlocked.

 

[mrfist9]

OKAY

I felt horrible this morning. Had big dreams of going to SFF today. But didn't happen. Got all weekend for that.

Took ski out at the local ramp instead to test it out.

It did good! I failed to take any media. Unbelievable difference. Got it to do 46.3mph. Which is astounding given some issues I'll touch on. And it did maybe 38 or so before. Rode it back to back with a buddies stock 550... It's night and day. I'm wide open doing tail stands on the 550. This is just blips tiny blips of throttle.

Full disclaimer since buying this ski I haven't touched the 650 whatsoever, just some new exhaust gaskets. Haven't opened the carb nothing it was running solid with its dinky wrong impeller and cavitation station.

I expected
1. The load to throw off the tune
2. Impeller too tall 13/18 skat.

Trying to build motivation to swap in that 9/17 skat tonight but ughhhh. It wasnt that bad but definitely some fun on the table missing

Ski has 1 major new issue.... It is a spark plug murderer!! Running BR8ES, played with the high speed screw a bit and frankly landed a little lean judging by cameraing the wash. But it kept murdering specifically the rear plug real bad. Borrowed a knife from a random and trimmed back the rear plug wire which was baddddd. Absolutely no visible wire. That made it work for the rest of the day. But still after a short while plugs were shot. And it was a misfiry mess.

So I'm thinking @WFO Speedracer is right and I need to ditch the old booboo electrics. Maybe I'm just now asking too much of a tired old coil.

I Want more power so 750 is going in soon. Gonna try some br9eyas. Do a better cleanup of the wires and ride the SJ all weekend. Maybe just maybe this will come out.

Good to reap the award of the hard work.

 

[WFO Speedracer]

Run BR7ES plugs or B7ES , the 650's , 750's ,900'S and 1100'S never liked 8's , we always had to swap them out or it fouled them out , I used to pull them out of brand new skis and swap them out they fouled out so bad .

Your wires may be shot but a set of b7es plugs and some non resistor plug caps will give it a boost in spark energy, it might be just enough .

Also I see you are running a stock 650 pipe, did you do the pipe mod on it , it will help quite a bit , do not expect huge power gains from where you are now running a 750 with a stock 650 pipe , you will be dissapointed.

 

[mrfist9]

Run BR7ES plugs or B7ES , the 650's , 750's ,900'S and 1100'S never liked 8's , we always had to swap them out or it fouled them out , I used to pull them out of brand new skis and swap them out they fouled out so bad .

Your wires may be shot but a set of b7es plugs and some non resistor plug caps will give it a boost in spark energy, it might be just enough .

Ugh running hotter plugs to solve problems just feels so wrong.

I run br9es in my 1100s no problems

 

[Myself]

I also have always run the BR9es in Kawi's with no issues. The "all or nothing" swap ski I recently finished has already been ridden many hours on the same pair of BR9es plugs. Breaks in the plug wires cause the spark to have to jump a gap. The end result is LOTS of resistance at the discharge which shorts the plug. I'm guessing if you check those plugs you blew through they will read shorted from the top to the threads or hex.

 

[mrfist9]

I also have always run the BR9es in Kawi's with no issues. The "all or nothing" swap ski I recently finished has already been ridden many hours on the same pair of BR9es plugs. Breaks in the plug wires cause the spark to have to jump a gap. The end result is LOTS of resistance at the discharge which shorts the plug. I'm guessing if you check those plugs you blew through they will read shorted from the top to the threads or hex.

Yeah I agree with this logic. It could be any combo of the coil and wires being shot honestly. I just trimmed them both back gave it some dielectric grease in the boots. See how it does tomorrow with br9eya & br7es (what O'Reilly's was able to get for the morning)

I'm all for fixing things correctly. Sure the wires are just clapped honestly... But all this 650 has to do is give me some fulfillment this weekend. It owes me nothing really. If it blows up on Sunday I'll be proud of it. Known good 750 + 750 ebox sitting on the shelf. End of seasons frankly already here. Really wanted to make sure the pump stuff worked and was worth it!

Loaded up!

 

[WFO Speedracer]

Ugh running hotter plugs to solve problems just feels so wrong.

I run br9es in my 1100s no problems

As I said before BR8ES plugs were fouling out in brand new machines here , when I worked at the dealership , I serviced out a brand new ZXI 1100, I told the owner I needed to swap out the plugs in it, he said we are not doing that run what came in it , he has a warranty , I said fine but you get to deal with the customer when it boomerangs , about two hours later I see the customer pulling in with the yellow ZXI 1100 , the customer is steaming mad and as promised I went and got the owner to deal with him , I told the owner you want to get me that set of plugs now ?


In different parts of the country you can get away with running different heat ranges of spark plugs apparently , but here if you want to ride and not foul plugs you run BR7ES in Kawis , the Seadoos will run BR8ES plugs all day long with no complaints , they will also run on BR7ES just fine , you are right the wires are probably beyond shot , the only real way to know is cut them open and see , but what I suggested just might get you through the weekend, for sure it isn't a fix for obviously broken parts.

 

[mrfist9]

Did good all day on the BR9EYA's
Impeller still way off. Some stuffs way off. But hey it works does the best tail stands ever. The side holds are also impeccable for subs.

Until the throttle bracket sheared. Got it tigged back up by a buddy tonight for tomorrow though! Gonna loosen up the cable some more I guess and maybe wrap something around the grip. Throws definitely too short and I yanked too hard. Not great. Need to just order the right thing.

 

[mrfist9]

An update on this thing. I've been riding it putting tanks through it. Haven't touched a thing but feeding it plugs. Helene brought our water levels back up so enjoying that while I still can before pulling the 650.

Super stoked I can submarine this thing on demand now, tail stand on demand. Trying to figure out riding it backwards. A buddy laid down on his B2 and I successfully sniped him with a firehose. Best day ever.