Masterminded 346XP Tips And Tricks

[Mastermind]

Here's a few little things we do on the 346XP.....

No closeups of the port work.......we've seen too much of that stuff already. Just remember......no popups were harmed in the porting of these three cylinders.

 

[Mastermind]

OK, who has seen a 346XP with this on the fuel tank?

 

[Big_Wood]

OK, who has seen a 346XP with this on the fuel tank?

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not me ever. sitting here interested

 

[Red97]

Listening

 

[Mastermind]

Now getting onto the tips.....

When you port a 346XP, the tank vent doesn't seem to keep up.

So, pull the carb floor.





Then pull the vent with a set of needlenose pliers.



Here's the vent....



Push the guts out with a stiff wire.....





Put only the big silver piece back in......throw all that other stuff in the trash.

 

[Mastermind]

Then drill a 1/16" or 1/2mm hole here....



The hole needs to be as far back in as possible, so the white piece doesn't cover it. If you're not sure it's far enough back, just slot the white piece a little so it can breathe past it......

Then put it back together.....and stuff.

 

[Mastermind]

Next.....

Notice this flat spot on the intake spigot? No matter if you spin a popup (God forbid) or cut the squish (much better) the jug will end up with a flat spot here when you cut the base.....



Forget the base gasket on a 346 if you are doing machine work. Using it just means you must cut even more from the base.

To be sure you have a good seal on the intake....



I use brake parts cleaner to degrease the parts.......then I put a thin layer of Loctite 518 on the spigot.



One more little trick here.......never take that damn clamp off. Just slide it apart with the clamp latched.......then back on the same way.

Also.......note that groove in the cylinder extension? That's a "make damn sure" groove. It's insurance for the impulse.....

 

[tacomatrd98]

OK, who has seen a 346XP with this on the fuel tank?

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Guessing that was a Trio Brake with the trio parts removed

 

[Mastermind]

Here's another tip for y'all machinist types.

When you cut the base on a 346XP, you'll need to make sure the intake ain't in a bind on the case when you bolt it back together. If the intake is being pushed up here......it may leak. I've fixed several that this spot was overlooked on.



It's pretty simple......if you lower the jug .050", just take that much out here.

 

[Mastermind]

Guessing that was a Trio Brake with the trio parts removed

I reckon it must be a Trio Brake tank....the case doesn't have Trio parts.

 

[Mastermind]

Here's another spot that needs clearance work.......this bottom fin hits the case.....



Sorry for the crummy pic.......hopefully you can see where I cut some of the fin away.

 

[Fire8]

Would that be same on the 45cc 346's

 

[Mastermind]

I know all y'all have seen a 346XP with the top cover melted.....

Here's what we do to maintain a stock appearance, protect the top cover, and open the muffler up enough to support a ported jug.

 

[Mastermind]

Would that be same on the 45cc 346's

Should be Danny.

 

[Mastermind]

I almost forgot the carbs......



I just use a small cutoff wheel to remove the tabs on the limiters.

 

[PULLINmyPOULAN]

 

[cgraham1]

Thank you for sharing!

 

[Mastermind]

Then the coil.......

Most of the guys I do these saws for like to use an unlimited coil on em. They are getting harder to find.......so we've had a few guys send a aftermarket coil with them. They seem to do fine. Will they last? I'm not sure yet.......time will tell.

I don't mind the 14,100 coil on em........I just tune with a tach right up to the limiter......then lean it out a fuzz more.

 

[Mastermind]

I save the 14,100 coils I remove, and use them on 372XPs, 385XPs and 390XPs........



To give you guys an idea of how many 390XPs I've done.......here a few of the 13,000 coils I've removed.

 

[Mastermind]

Questions?