Please help: OEM 44 (64X) carbs on Pro-Tec 62T manifold - no jetting question! ;-)

[jetfreak78]

Hello,

i recently changed my carb setup (superjet) to a 62T pro-tec manifold with 44 oem carbs (64X).
There is no carb plate, like Boyesen or R&D have, on the pro-tec manifold, so the carbs are directly mounted to the manifold (x-pattern).
I build the engine with manifold and carbs mounted and put the complete setup in the ski. Mounting the carbs was a pita even with the engine out. i had to fabricate a wrench, because the nuts are so tight to the carb bases...
My problem is now that i have to change jets in the carbs, i can not reach the carb nuts. maybe, with a lot of luck i can get the carbs off, but never in life tight back on.

am i the only one with this setup? how do other people manage this problem? I do not want to take the engine out every time i have to change a jet in the carbs!

Have others found a solution for this?

My last plan is to produce a kind of carb plate like R&D or Boyesen with the angular bolting pattern, but then there have to be two plates. one that bolts to the x pattern of the manifold and has angular holes and one that bolts to the carb bases and has the accordingly angular holes. Hope this is understandable ...

But that 2 plates would raise the carbs ~3/4 inch above the manifold. I do not now if this is a good idea, as it would lengthen the way from the carbs to the reeds, etc. and so reduce the signal from the crankcase to the carbs, or what. what do i know.... this unfortunately transcends my knowledge of carbs or two strokes

Can someone please tell me, if this is a good or bad idea?

Your help is greatly appreciated. Thank you very much.

I searched but found nothing related...

 

[Harbor]

I have the same problem on a buddy's boat. My jetting is close and runs pretty good so we're just leaving it alone.

To your point though, not sure how your idea could even work, there is no room on the manifold top flange (at least on ours ) to run any other bolts in any other pattern for a plate.

Wait if your good at fabrication, maybe pull the manifold off and weld flanges so you can do an offset pattern with a standard type carb base plate like modern manifolds. Or maybe get a php manifold, aren't they like $280 USD

Btw, our manifold was warped on the top flanges and had to be resurfaced

 

[jetfreak78]

PS: i even can not get the manifold of with the carb mounted in the hull, because it is mounted with studs and and there is also no room

 

[Storbeck]

I would suggest your best solution would be to use an oem intake manifold, they're cheap and work well.

 

[jetfreak78]

 

[Storbeck]

That looks like it might be setup for 48mm carbs? If so I would even more so suggest using the oem manifold as a better fit for the 44mm carbs

I do have to admit that manifold is pretty cool though.

 

[jetfreak78]

I would suggest your best solution would be to use an oem intake manifold, they're cheap and work well.

I´m in Germany. nothing jetski related is cheap here. i searched half a year to get this manifold ...

 

[jetfreak78]

I´m in Germany. nothing jetski related is cheap here. i searched half a year to get this manifold ...

I wanted an OEM Mani, but could no get my hands on one

 

[jetfreak78]

I have the same problem on a buddy's boat. My jetting is close and runs pretty good so we're just leaving it alone.

To your point though, not sure how your idea could even work, there is no room on the manifold top flange (at least on ours ) to run any other bolts in any other pattern for a plate.

Wait if your good at fabrication, maybe pull the manifold off and weld flanges so you can do an offset pattern with a standard type carb base plate like modern manifolds. Or maybe get a php manifold, aren't they like $280 USD

Btw, our manifold was warped on the top flanges and had to be resurfaced

My jetting is not even close :-( Because of the x-pattern of the manifold my idea was 2 plates to first built an offset pattern over the manifold

 

[Storbeck]

You can't just buy on on ebay?

 

[Storbeck]

https://www.rhaasproducts.com/ProductDetails.asp?ProductCode=domsp248yam

I'm not 100% sure but I think this is exactly what you are describing.

 

[jetfreak78]

https://www.rhaasproducts.com/ProductDetails.asp?ProductCode=domsp248yam

I'm not 100% sure but I think this is exactly what you are describing.

Yes, this would be the lower plate, but then you need another plate to bolt the carbs on. Then you can bolt the 2 plates together through the offset holes and can take the carbs of together with the carb plate

 

[jetfreak78]

what you think about raising the carbs with this 2 plates as described in my first post. is this bad?

 

[Storbeck]

Conventional wisdom is that extra volume in the inlet between carbs and motor is bad. How much difference it actually makes I have no idea, doubtful you'd ever notice a difference but don't know.

Hard to tell in the picture but it appears that you already have a sub-optimal situation with an intake designed for 48mm carbs using 44mm carbs (so larger diameter, more volume). No idea if that actually matters in reality though.

@JetManiac sells oem 64x manifolds for a pretty reasonable price and I bet he'd ship you one to Germany. It's not very exciting but it's what I'd be doing if I were you.

 

[JetManiac]

I would switch to the oem manifold setup and sell the protec. Do you still have the oem plate that the dual 44s were mounted to stock?

 

[Harbor]

View attachment 384877View attachment 384878

Yeah, your manifold has 2 extra bungs.. sweet... so you'd remove the 4 studs from manifold, uses counter sunk Allen's to hold your carbs to your plate, and use the manifolds extra bungs to hold the plate to the manifold. Gaskets above and below your plate...

No need for a thicker than normal plate

 

[bored&stroked]

I would switch to the oem manifold setup and sell the protec. Do you still have the oem plate that the dual 44s were mounted to stock?

He's said in Germany he can't find one.

 

[JetManiac]

He's said in Germany he can't find one.

Ship one from the US. And sell the a/m mani there.

 

[jetfreak78]

That looks like it might be setup for 48mm carbs? If so I would even more so suggest using the oem manifold as a better fit for the 44mm carbs

I do have to admit that manifold is pretty cool though.

I think i mesured 46mm on top of the manifold. Im not sure, but never 48mm

 

[jetfreak78]

I would switch to the oem manifold setup and sell the protec. Do you still have the oem plate that the dual 44s were mounted to stock?

Hi jetmaniac. You mean a oem 64X manifold,right? And with this You can easily take the carbs of? I wanted one, but as said could not get my hands on one. I have no plate, just the carbs and the manifold. What would it cost me for the complete manifold with plate and gaskets, shipped to germany. Maybe i need some other parts also.