recently acquired a 85 JS550 and have some questions regarding it. I bought it to get into the standup world lol. It has 180 psi in both holes. Aftermarket exhaust, supertrapp waterbox, K&N. Previous owner was running amsoil at 50:1. Should i be running more oil in it? I run 40:1 Pennzoil full synthetic in my SS sitdown. Also he is running B7ES plugs. Some people were mentioning to me that these plugs are hot and should run some other kind. Also the plug caps dont click on like they should and was thinkin bout just running new plug ends but might be an issue of the wire length. Any inputs here? Also moving to the gas tank. The fill cap on the front of the ski is blocked off with a plate and the tank is blocked off underneath. So u only can fill with gas by removing unscrewing the cap on all the pickup lines. Dont really like the setup. Was thinkin about an aftermarket oversize gas tank anyways just unsure if it will fit in space i have. Also the handlebar has a bit of side to side movement not bad though but will probably need some new bushings. Any input you have will be greatly appreciated as i enter this whole different world of standups I will post some pics. Thanks
New to me js550 questions
- Thread starter golferdude
- Start date
i have an 86. an it has the same plug problem. you can either buy new ones and install them or like i did i had an old motor with screw in plug caps been running them for 5 years now. sometimes they pop off when i remove the caps from spark plug, but that's the only time. with that i just re-twist them on. for you tank issue, your going to have to reverse the process that was done to it. your going to have to take the block plate off and probably get a new tank. i cant tell anything about the tank i would have to see the front. you could also do as one of my super-jet tank and just install a new tank cap on top the tank, and leave everything as it is.
- Location
- St Charles IL
pretty sure you should be running resistor plugs
that compression is very high for a 550 piston port motor... I would look into running at least a 50/50 mix of race gas.
also any oil stamped with TCW3 rating will suffice... i mix 44/1 but you can do anything anywhere between 40/1=50/1
that compression is very high for a 550 piston port motor... I would look into running at least a 50/50 mix of race gas.
also any oil stamped with TCW3 rating will suffice... i mix 44/1 but you can do anything anywhere between 40/1=50/1
- Location
- North Carolina
I have a westcoast oversized tank I was going to sell on ebay. Hit me up if your interested. It has the fill neck inside so you could keep your block off.
Im interested just need to make sure it will fit with my supertrapp waterbox up there? How much u want
- Location
- North Carolina
150 $plus shipping and paypal fees. They normally sell for 200 on eBay.