Jetmate 701 swap

[Quinc]

What are your headpipe screws at? Whats your water current water temp?

-Bottom screw barely cracked for a trickle of water.
-Middle closed.
-Top screw adjusted until chamber temp gets hot. (120ish)
Current water temps low 50's.

Also do you run a FCV going to the waterbox?

 

[Aquaholic]

I'd close that bottom screw , completely, and then just make your adjustments on the top screw as needed. You can't get to that bottom screw anyways with the doghouse on. 180 is a good starting point. You may be able to choke it down some more during winter months. Just keep an eye on waterbox temps as the water gets warmer. It goes without saying that with a carbon waterbox, you want to stay on the safe (cool) side. BTW, do you have underpadding under that box? I can't tell.

When I ran my factory pipe I actually plumbed into the aluminum tube coming off of the stinger, as I wanted to keep the hose going into my waterbox from melting.

And, yes, I run a FCV.

I see your chamber is not supported. How long have you been running it like that? You may want to figure out a mount to the flywheel cover to prolong coupler life.

 

[Quinc]

I'd close that bottom screw , completely, and then just make your adjustments on the top screw as needed. You can't get to that bottom screw anyways with the doghouse on. 180 is a good starting point. You may be able to choke it down some more during winter months. Just keep an eye on waterbox temps as the water gets warmer. It goes without saying that with a carbon waterbox, you want to stay on the safe (cool) side. BTW, do you have underpadding under that box? I can't tell.

When I ran my factory pipe I actually plumbed into the aluminum tube coming off of the stinger, as I wanted to keep the hose going into my waterbox from melting.

And, yes, I run a FCV.

I see your chamber is not supported. How long have you been running it like that. You may want to figure out a mount to the flywheel cover to prolong coupler life.

Haven't ran it yet. Just finally got the exhaust plumbed. Still need to take it all back apart and clean it up, add hose clamps etc.

Chamber is mounted with the flywheel mount only. Have turf under the waterbox, but will stick a piece of rubber under it as well. Appreciate the help!

Hoping I can break 40mph now.

 

[Quinc]

Shes water ready! Just need to find time to run to the lake and giver her a shake down.

 

[Quinc]

Look what I found! After removing the 3 different paints; I am trying to decide on painting them or turfing them.

 

[Quinc]

First ride with the factory mod pipe and HELL YEAH! So much more power! Low and mid range are awesome. Top end signs off early though. But I think shes too rich and I need to play with the mid and bottom headpipe screws. (previously tuned/ran on my SJ.)

Also she is now running significantly hotter. So picked up some 1/2" aluminum tube from HD and plan to replace the cooling through hull tube.

 

[Quinc]

Thought it would be a simple pull the old one out and hammer the new one in. Coming out was easy enough with a pair of vice grips. Luckily I had a long 1/2" drill bit to get most of the way through, then used an air dremel and cutting burr to do the engine side. My 5200 was dry and even though lowes website shows 6 in stock they didn't have any.. So went with Loctite Marine. Looks to be fairly similar, but cant be as good because it wasn't nearly as messy.

Question do I keep it going to one side of manifold or do I tap the manifold for dual cooling and do a 1/2" to 3/8" Y fitting?

 

[SteveC]

dual cooling and do a 1/2" to 3/8" Y fitting

This just sounds wonderful, but if there’s only one outlet on the head, perhaps your flow rate won’t be affected by the size of the feed.

That said, I am in favor of always tapping the 2nd side and feeding both. Non-quantitative feel good reasons.

 

[Quinc]

This just sounds wonderful, but if there’s only one outlet on the head, perhaps your flow rate won’t be affected by the size of the feed.

That said, I am in favor of always tapping the 2nd side and feeding both. Non-quantitative feel good reasons.

Good point. Guess I will need to take her out tomorrow for testing her out how she is.

 

[Quinc]

Took her out yesterday! And shes deff running cooler but still hotter then I would like. With the original thru hull tube the manifold, headpipe and chamber would steam and sizzle when I splashed water on them. Now the cylinder temps are staying around 140, and no more water sizzle anywhere; and the chamber temp is around 170-180. So have some 1/4" npt x 1/2" barbed fittings coming in the mail. Going to drill/tap and install the larger npt fittings at the pump and manifold for piece of mind when towing adults on tubes.

Also the top speed was only 35mph. Gets there real fast though! Still running rich but going to get a tach hooked up and tune her right. *No change in top speed opening the top bpipe screw another 2 turns.

 

[Quinc]

Been thinking about the water routing now with the extra flow. Should I run the water coming off the head overboard or into the waterbox? Or should I run the T before the FCV overboard or to the waterbox? Only have 1 pisser. Or should I run a Y fitting and both the head outlet and pre fcv overboard through the one pisser?

The goal is max low/mid range power (need to get on plane) while not melting anything like the carbon waterbox with 700lbs of adults and pulling a tube full of kids.

 

[kevbo]

I would replace the fcv with a .100-.125" restrictor and call it a day.

 

[Quinc]

NPT fitting on pump upgraded from 1/8" to 1/4" old one ontop.


Didn't like that I could only bring the boat or the couch; so modified the shorelander trailer to fit the 'mate with some angle iron and an extra 2x4 on the bunk. Still Need to do something to move the gp over a couple inches or raise it with another 2x4.


Angle iron goes down around half the length of the main bracket.

 

[Quinc]

All that work on the cooling system and the exhaust is still getting 200+. Cylinder is fine running around 120 at full throttle. Swapped out my bottle neck 3/8 T with a 1/2 - 3/8 Y spliter. Then realized I am an idiot. Pulled out the adjuster screw from headpipe and the water hole is blocked. Had to use a tiny drill and hand spin it to clear it out. Also opened the bottom and middle screw just a hair.

Any tips on adjusting the pipe so its more linear and doesn't have such a big hit. Trying to pull a wakeboarder behind a 2stroke is a pain in the arse. lol

 

[Quinc]

Shes still running too damn hot. headpipe and chamber are a little cooler and no longer sizzling.. Thinking I need to block the front fitting on the head so only the back fitting on the head goes to the headpipe. Should force more water into the headpipe and cool it down. Not sure if that will increase cylinder temp any significant amount though..