Super Jet Le RN big bore 850 + color change build

[d_moss]

Well, to be fair - that's the kind of knowledge/know-how you typically pay a motor builder for. Without that, you have to figure it out yourself.

I love Blowsion dont get me wrong but lots of emails and calls were exchanged and no mention of pistons hitting the case was ever mentioned to my knowledge. Kind of a big deal. Dome clearance issues I understand I opted for the better looking $200 cheaper ada head.
Rather than the Blowsion 2 piece.

 

[d_moss]

 

[d_moss]

so no facy expensive silly couplers. I am ditching the stock long hose too. Prob will buy a straight of 2.5in radiator hose.

I will just use a 2-2.5 in reducer coupler for intercooler pipe for now and maybe later when I feel like re powder coating the chamber I will weld on a 2.5in stinger.

 

[d_moss]

one more thing. I am using a 650 stator it has a white wire with a red stripe, a brown, and two greens i think. Would I plug the white/red wire into my red wire inside my 701 RN ebox? Then just match the other wires since they are the same?

 

[d_moss]

White/red goes to white on the enhancer, and brown goes to brown. but the brown was almost black in my ebox. So it was hard to tell.

 

[d_moss]

 

[d_moss]

so I have never ridden an 850 but hold crap it flicks this sj around like crazy. My friend bough my old motor and a b pipe for it then added new rings. My old motor in his square rips way good too. i say as good if not better than when it was in my RN. I widened the exhaust ports on his 701 a bit and replacing the r&d dry pipe with a b might have made a good difference too.

My ski needs some bugs worked out. the pee'ers are to cold i think. the water coming from the head is only warm. I need to restrict it even more. I guess try some big jets. the pipe needs dryed out too. Its almost cold to the touch.

The carbs are all outta wack also it wouldnt start as soon as i got it to the river. I was plagued with bad old gas i tried to use at first then i think flooded it ect ect it was lame. Im sure the carbs are pretty rich as well. I bought them used so they will be getting rebuilt to eliminate a variable.

Also need to add another ground to the motor from the battery I think that will help with starting and spark.

Need a primer bulb.

Then figure out the carb tuning and pipe tuning.

I am running ngk br8es plugs in the ada head. Are they alright? or should I go hotter or colder?

 

[d_moss]

http://www.youtube.com/watch?v=WGwQKS-wREg&feature=g-upl&context=G232b713AUAAAAAAAAAA

[youtube]WGwQKS-wREg&feature=g-upl&context=G232b713AUAAAAAAAAAA[/youtube]

 

[Jonsson]

Yeah problems! So the pole i bought is an old x metal pole i guess and the hole the cold fusion turn plate bolt goes through is way bigger than the oe style bushings. the hole is about a half inch bigger than the bushings. so i have no idea what bar adapter was previously used and i guess i will either weld the hole shut and re drill or make a bushing.... dumb..

Yeah! more problems! So blowsion is very vague on their big bore pistons and of course give you no real instructions on what you will have to do to get honda cr 500 pistons to work. They just said here are the sleeves, here are the pistons and you will need this spacer plate too.

First problem the cases need to be bored WAY past the sleeves if you want to not modify the pistons. I did not want to separate my cases pay to have them cut more and then find out they need epoxied or the oil groove in the bottom of the transfers is important. so I cut the bottom of the pistons to the same height as stock 760 piston. Makes more sense to me anyways. Luckily there is a groove about a quarter inch from the bottom of the skirt and i used that as a guide line. Cut off wheel and orbital sander they were flat. I left just a hair of the skirt edge to measure the flatness around the skirt. I took a pic and you can see the faint line where the groove is in the bottom of the skirt.

Next problem with the spacer plate at .125 in and two .020 base gaskets and 42cc ada super bore domes (seadoo 951 domes) the pistons hit the inner part of the domes. LAME. so i added two more base gaskets that brought the squish to outer .048in and toward the inner part of the dome to .035 in. Better still to tight. I had the domes cut to the correct angle to fit the piston and took a tiny extra off Squish is now about .065 outter to .067 inner . barely an angle towards the center. The 4 dumb base gaskets are required to get the port timing decent. Blowsion needs to build a thicker spacer plate and possibly raise the intake ports on the sleeves. But yamaha seems to have it wrong in the first place. stock motors dont even let the piston drop all the way out of the way of the exhaust port. or go to the bottom of the intake ports.

two base gaskets and spacer plates

pistons hitting the case

I was quite the exact same problems. But right spacer plate and + 5mm stroke. I got exactly the correct position themselves.
In addition, the piston pin bushings accesso that the bearing edge of moving too.