Looper exhaust porting

[Capt.Insane-o]

go to your brp dealer and get a few cans of engine tuner and soak them in a container for a couple three days.

[Captain75]

go to your brp dealer and get a few cans of engine tuner and soak them in a container for a couple three days.

Aint such dealers around...

[racer]

Leave those holes open that would not dry stack the engine, they are low speed exhaust holes and for your use needed. I would not dry stack for your application. If the old rings break coming out its not a big deal, I use the old rings to clean the grove.

[Captain75]

Once again -best ball hone grit for my application?
Anyone used ball hone on a fingerported motor? Will it work?

[LittleCharger]

Forgot an issue in my last post; pistonrings...
I am doing preparations to drill fingerport windows and I want to get rid of the old rings.
The upper ones are easy, the lower ones on the other hand are badly stuck, how do I get rid of them without having to break the rings? How about cleaning -scotch brite? Diesel?
Funny thing is that all cyls had 100+ psi with all the lower rings totally stuck and a bad starter battery...

Heat the piston ring area with a torch...the ring will expand and will break itself loose....then clean the piston groove area.

great thread!

[thornl01]

Do you not have access to an automotive type machine shop? Any shop worth a Damn would have a honing cabinet simular to the
Sunnen CK-10 ( older) or the CK-77. they will leave the proper crosshatch for the best ring seal.
Sorry, but a good/reputable shop, wouldn't get caught dead with a DINGLEBERRY hone in the shop.

Only way to go. period !

[lokinutz]

Once again -best ball hone grit for my application?
Anyone used ball hone on a fingerported motor? Will it work?

I use a 320 grit flex hone... 2-3 light slow passes in and out, reverse drill, 2-3 more light slow passes in and out, move to next cylinder. I also have slotted finger ports, just like yours. Worked great for the cross hatch ​only.

[Captain75]

I use a 320 grit flex hone... 2-3 light slow passes in and out, reverse drill, 2-3 more light slow passes in and out, move to next cylinder. I also have slotted finger ports, just like yours. Worked great for the cross hatch ​only.

320grit flex hone on the way...

[Captain75]

I've read i other threads about a certain cooling mod to make sure that an airpocket isn't created in the top of the block... Have I understood it right? How is this mod done?
pictures!?

[Captain75]

I've read i other threads about a certain cooling mod to make sure that an airpocket isn't created in the top of the block... Have I understood it right? How is this mod done?
pictures!?

no ideas?

[NosBoss]

I'm not 100% sure, but I think that's a closed deck mod.

[Captain75]

First piston drilled for the fingers.
maybe enlarge them a bit further down...

[Captain75]

I use a 320 grit flex hone... 2-3 light slow passes in and out, reverse drill, 2-3 more light slow passes in and out, move to next cylinder. I also have slotted finger ports, just like yours. Worked great for the cross hatch ​only.

Recieved my 320grit flex hone today, I will take your advice and try the method you stated!

another thing; Stock Pistons, are they coated on top with some black coating? I figured they were just burnt, but it seems almost impossible to get rid of, even with oven cleaner and scotchbrite...

[baja200merk]

Might be the picture but I would Angle fingers up a bit more.

[Captain75]

Might be the picture but I would Angle fingers up a bit more.

I've tried, its hard due to wrist pin.