372XP X-torq 75cc Conversion & Porting

[mdavlee]

Thanks Mike, I always manage to confuse the nomenclature. Makes me second guess leaving them there.

I tried one like that. Didn't have the high rpm power. It was ok at lugging

 

[XP_Slinger]

I tried one like that. Didn't have the high rpm power. It was ok at lugging

Thanks for the intel. Guess that settles it, they will be no more.

 

[mdavlee]

Thanks for the intel. Guess that settles it, they will be no more.

At least blend it where it enters.

 

[XP_Slinger]

At least blend it where it enters.

Red my mind.

 

[mdavlee]

Red my mind.

I spend a ton of time in them. I open the 50mm and 48mm up more than stock as well

 

[RIDE-RED 350r]

Like I was saying earlier, we know at least one way to make an XPW sing pretty good.

 

[XP_Slinger]

Here's how much I have to grind off the floor of the intake.

 

[XP_Slinger]

Transfers are where it really sucks to be a stuck with a dremel. Raised them to 123*, but this is the best they're gonna look. Entry angle isn't flat either, but I know another XPW ported like this and it runs HARD.

 

[RIDE-RED 350r]

So what's the final decision on the lowers???

 

[Lightning Performance]

That angle roof won't matter much.

 

[mdavlee]

So what's the final decision on the lowers???

Check out the Xmas thread I did. That's how much I open them

 

[XP_Slinger]

Ok so I'm saying goodbye to my pride so others can see how easy it is to make a mistake if you're not thinking 100% of the time. Marked my piston, took the cylinder back off and started grinding. Sounds normal right? Well, I stopped thinking and started grinding on the top of the intake port! Idiot! As you can see in the pic the lower ring is partially exposed. Luckily the locator pin isn't. I don't feel good about it but I chamfered the hell out of it and I'm gonna cross my fingers it doesn't snag. Lesson learned, slow down and pay attention! Always!

 

[RIDE-RED 350r]

Awe man!!!

 

[XP_Slinger]

The pic makes it look worse. Still a mistake but I'm gonna run it. If it snags I'm only out $40. Will still suck though.

 

[XP_Slinger]

Blended the Hump in the lowers, nothing crazy just smoothed them out into a funnel.

Before


After

 

[RIDE-RED 350r]

Looks good, and all you can do is give it a whirl. I hope the intake doesn't cause a failure because I want to see how the two XPW's compare.

 

[XP_Slinger]

Looks good, and all you can do is give it a whirl. I hope the intake doesn't cause a failure because I want to see how the two XPW's compare.

Ditto, fingers crossed. Getting ready to put it back together now

 

[RIDE-RED 350r]

Looking forward to hearing how it runs.

 

[Lightning Performance]

That jug is one nice looking casting. It should run great after the work you did. Are you going to thin the divider any?

 

[bikemike]

Time to remove a ring

Ok so I'm saying goodbye to my pride so others can see how easy it is to make a mistake if you're not thinking 100% of the time. Marked my piston, took the cylinder back off and started grinding. Sounds normal right? Well, I stopped thinking and started grinding on the top of the intake port! Idiot! As you can see in the pic the lower ring is partially exposed. Luckily the locator pin isn't. I don't feel good about it but I chamfered the hell out of it and I'm gonna cross my fingers it doesn't snag. Lesson learned, slow down and pay attention! Always!
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