Lets build a Husqvarna 262XP, SCARR style!

[srcarr52]

This is where all the XP’s come from.

 

[srcarr52]

It popped and ran for a little bit but then all I could get was an occasional pop.

I guess I took enough out of the squish.



I just shopped around for a plug that was indexed correctly.

 

[srcarr52]

Any comments while my shoulder recovers from all the pulling I did before I found the closed off spark plug?

 

[srcarr52]

Here's it running... I think it needs something. Taking suggestions.

 

[pbillyi69]

which way do you want the plug indexed? with the gap toward the top of the chamber or towards the piston? or another way?

 

[pbillyi69]

looks like it runs pretty good. take another swipe off the rakers and see how it runs

 

[srcarr52]

which way do you want the plug indexed? with the gap toward the top of the chamber or towards the piston? or another way?

Gap towards the piston/intake wall.

 

[Dolkitafreak]

Swap to a non protruding plug, easier than checking a bunch of different imo.

I’d like to see it with a little more exhaust and intake duration, 102-120-78 sounds feasible. Looks good as is.

 

[CJ Brown]

Did you advance the timing at all?

 

[huskihl]

I’d lower the intake floor 3° and give it more ignition timing

 

[srcarr52]

Did you advance the timing at all?

A fair bit. It seems like it could use more.

 

[Stump Shot]

I’d lower the intake floor 3° and give it more ignition timing

+1

 

[drf256]

Sounds lean.

What’s were your final numbers?

It takes a lot to hit the plug on those. I’ve added a divot to the piston crown in the past for it, but I take less from the base now.

Much easier to assemble the entire intake tract onto the jug and then install in one fell swoop. I usually grind the case area where the intake partition drops. I don’t touch the rear pads anymore because I take less off the base.

The enemy of success is perfection. Looks pretty damn good to me.

 

[Red97]

Here's it running... I think it needs something. Taking suggestions.

Parked on a shelf and run one of your 562s?

Possibly a bit more ignition, or fuel, see if it picks up with the fuel.

Or give it a bit more duration.

 

[srcarr52]

Sounds lean.

What’s were your final numbers?

It takes a lot to hit the plug on those. I’ve added a divot to the piston crown in the past for it, but I take less from the base now.

Much easier to assemble the entire intake tract onto the jug and then install in one fell swoop. I usually grind the case area where the intake partition drops. I don’t touch the rear pads anymore because I take less off the base.

The enemy of success is perfection. Looks pretty damn good to me.

That's where it made the most power. Any more fuel and it would 4 stroke at 13.5-14 and not have as much grunt.

104/120/75

It's turning 10.8-11k in the cut. With the way everyone talked about these I expected more. I'll have to drop that bar and chain on another saw to get a better feel, it's a pretty hungry chain!

Hitting the plug isn't a big deal, that plug was indexed in the absolute worst position.

Parked on a shelf and run one of your 562s?

Possibly a bit more ignition, or fuel, see if it picks up with the fuel.

Or give it a bit more duration.

I don't have any 562's around but I feel they would have more power.

I plan to put a timing light on it and see where it's at. Probably add a little more to see if it likes it.

 

[Redfin]

Here's it running... I think it needs something. Taking suggestions.

What were final durations? What was ex% to bore?

 

[srcarr52]

What were final durations? What was ex% to bore?

Ex/Tr/In openings
104/120/75

Durations
152/120/150

Ex width was ~65% of bore.

 

[Redfin]

You could probably get away with some more bd with that ex width. You have good primary comp, Im gonna agree with Kev on intake.

 

[pbillyi69]

this is a good thread. a well known porter that makes good stron saws, builds a saw and says. thats not good enough what do y'all think. this is how we all learn. nice job

 

[trooney]

I guess thats how they got real good..