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Not sure a stock motor will turn that 155. 13/26 maybe in a 148 pump

"Runabout" is not an oddball class, it is the 1200 that is oddball. GPR 1200 is a runabout as is an STXR and a seadoo xp or gp800.

There was always a runabout "naturally aspirated" class which was for 4 stroke runabouts up to 2000cc with no superchargers. 2 strokes up to 1300cc with no triple pipes/dry pipes could run with them....

I dont recall what the class rules are probably because with regard to 2 and 4 strokes they dont make much sense but I think a stock 1200 can run with 4 stroke naturally aspirated. The problem is...

Dont typically come into the Yamaha section but just happened to catch this. I also looked into this 2 years back and found it is hard to find people who are running these old 1200 2 strokes. He had...

http://greenhulk.net/forums/images/misc/quote_icon.png Originally Posted by Meen95z http://greenhulk.net/forums/images/buttons/viewpost-right.png
Quick question, my shredmaster plate...

:lurk5:

He was making up for the 8 years he was a member and never posted (almost). All those trouble free hours no time to go on the internet :D

Check the ignition box and see what is in there. What are the compression numbers for you on a fresh top end?

Dont think this thread will get much action on here. You may want to try PWCtoday.com there are alot more stand up riders on there that will have experience with that setup.

Down and back is most aggressive up and forward is least. I dont remember how much in between adjustment there is on that brand.

Ask Riva what fuel to use. May be worth checking the fuel requirements of the organization you are racing with.

Suggestion would be to try what you have and see if it dials in, if not then change them. Here is a diagram from Novi that shows the return restrictor



...

Sounds like a good place to start- a little rich. Novis need a restrictor in the return line usually recommend a 95 or 100 main jet in that.

Was the gp a big bore or triple pipe?

Report back when you get into them

Isnt the fuel pump on the carb?

What is in them now?

What is the installed spacing on the couplers? Thinking if they are too far apart it could cause this type of issue. Also how much does the hull weigh?

https://impros.com/store/index.php/tech-info/tech-info/impros-skat-trak-impeller-recommendation-chart-for-1987-2013-kawasaki-watercraft.html

Yea I thought about it years ago. Was thinking of a vertical plate/bracket between the thru hull and charger with the tensioner and bearing holder incorporated into it. Seemed like would need a...

The guy who built the 15f I have originally ran the turbo setup with stock pistons + 1mm spacer + like 7 lbs boost before he switched to aftermarket pistons.

The shorter rods on the 12f crank...

...

On 12f rods makes more sense. Originally you said 15f rods and pistons in a 12f motor. They would be way down in the hole.

If you need a 250x rod and piston I have some. Just pay shipping

"I bet a set of high comp forged 250-310 pistons on 15F rods would drop right into a 12F and you would have a pump gas boost ready 12F for about as cost effective as you could get."


15f stroke...