B-Pipe Clearance

[brapperdoodle]

I sent my pipe to Jet-Hot for a ceramic coating and I’m finally getting everything in place and finishing up my build. I reinforced the hull on my 1995 Yamaha Superjet and of course filled the bond line with epoxy. I used 2 layers of 1708 biax with backer. Now with my engine in place and trying to fit the pipe, I’m having major clearance issues. I’ve already ground out such a groove that I’ve run into the factory glass on the bottom hull. I’m not even close to fitting... do I need to grind all this epoxy out to get my pipe to fit? This blows.

 

[fastgtfairlane]

grind the hull or dent the pipe are your only options really.

 

[Quinc]

Take the head pipe off, connect the chamber to the coupler and then put it on as one piece. I have the same issue in my SN and doing it this way it fits perfect.

 

[mikidymac]

Is your engine aligned and bolted down?

 

[Storbeck]

I have a square nose with a B pipe that has reinforcing and the fit is about like yours, mine has a piece of turf shoved between the chamber and the side of the hull, I'm not thrilled about it but mine is a lot less pretty than your so I just live with it.

I can tell you that on mine the only way I can get it assembled is to have the head pipe disassembled from the manifold with the coupler on the head pipe hose clamp tight, cut the end of the coupler that slides over the chamber at a taper to help it slide over, and slide the head pipe onto the chamber from behind, then bolt it to the manifold. Use windex as lubricant on the coupler (nothing else).

You're a little closer than it looks because of the angle of the joint between the head pipe and chamber, but it probably won't fit without touching.

 

[brapperdoodle]

Take the head pipe off, connect the chamber to the coupler and then put it on as one piece. I have the same issue in my SN and doing it this way it fits perfect.

I will defiantly try that!

 

[brapperdoodle]

Is your engine aligned and bolted down?

I did put the bolts in and align the engine. It’s not torqued down though cause I’ve been taking it in and out a bunch

 

[AAlamo]

You can mill down the factory pipe manifold where it connects to the cylinder a little bit. I did it on one of my Fx1’s so it would not rub as bad.

 

[fastgtfairlane]

You can mill down the factory pipe manifold where it connects to the cylinder a little bit. I did it on one of my Fx1’s so it would not rub as bad.

that would also work, however its worth noting that milling the manifold like you mentioned also shortens the total length of the pipe which will increase top end power at the expense of a little bottom end. probably not enough to notice really

 

[Scarab195]

Helicoil the manifold for M8s. They're narrower and will allow you to clock the headpipe towards the motor a bit

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