Piston Burner Part DEUX

[waxhead]

what pipe do you have
and how have you set the pipe up

 

[SkiDaddy]

I'm running a wet pipe, a Limited "B" from factory pipe, so that shouldn't be a factor. I do have my waterbox fairly dry though.

I do wonder if I got some bad gas.....:lightning:

 

[SkiDaddy]

Pipe plumbing is standard - dual cooling to dual inputs on the manifold, front head outlet to a water bypass fitting, rear thru a strainer (gotta keep the pipe adjusters flowing) to bottom of headpipe, top of headpipe to another water bypass fitting. I run a 13/64" restrictor on both head outlets.

Water was coming out both bypass fittings normally both before & after. Temp was just warm. I never beached it from the ramp to where it melted.

 

[yamaslut]

Ouch.... sorry to hear that Bob...

 

[SkiDaddy]

Yeah, I only had like 5 minutes of waves before she blew.:banghead: At least we weren't out past the buoy.:hail:

 

[yamaslut]

Yeah, I only had like 5 minutes of waves before she blew.:banghead: At least we weren't out past the buoy.:hail:

yeah... those were some fun waves too...

 

[SkiDaddy]

Well it appears the culprit is my B-pipe - I have one with the 43mm diameter manifold, which is bad for ported/bigger than 701cc engines.:banghead: :banghead: :banghead:

This makes the front cylinder run hotter/maybe leaner. An easy fix.:smile:

Still gonna do a leakdown test tonight...:sneaky:

 

[kid4now]

Dont want to sound negative but that doesnt sound like it to me. I hope that fixs it for ya though.

How long have you been running this setup before these problems started ?

Flip the piston over and look on the under side of the dome. Does it show any discoloring (blackening) ?

 

[SkiDaddy]

Been running it 9 months, hammering it hard. I am gonna leak test tonight.

The bottomof the piston is covered w/black goop from the hole in the side. Doesn't look like it got too hot, but hard to tell.