A peek inside my '05 DE250

[SideshowBob]

That is cool!

Looking forward with trepidation to tearing down the 250 completely this fall.

[AZRickD]

I got the GG back today with the borrowed head installed. First thing I noticed was the increased resistance in kick-starting it as I performed a few heat cycles. It got up to 103F, so I re-jetted to a fairly rich 175/42. It's tough to discern increased power on the street, but it was ample.

Now I have to wait for RB to get my squish-modded head sent back in Phoenix. What kind of beast am I going to have when that is paired with my new top-end? I may have to go back down to 50T to tame it.

Edit: Looks like a one-day turn-around. Just got the shipping notice.

[AZRickD]

Responses from some questions I asked Ron:

Hi Rick,

I shot for .045" (1.15mm) for final squish (using your supplied test solders), I hope it came out to be between .040" to .050" (1.01mm to 1.27mm). Because the squish is now closer, you might need to get some .062" acid or rosin core solder to make your inspection test.

I then asked if I should plan for leaner jetting with the squish mod:

Yes I would, and jetting changes should be more predictable and more forgiving.

Thank you, Ron

[Skidad]

.040 is getting low and could need better than pump gas. Closer to .050 would be better. Of course you can make adjustments with base gaskets.

[AZRickD]

That's why I live on the edge, SkiDad.

I only got one gasket (.5mm) from the Go-Fasters kit, so if compression is an issue (we'll do a compression test comparison), I'll have to order more.

A limiting factor is that "pump gas" "Premium" in Phoenix = 91 octane.

On the plus side for me, I ride like a slug and am a short-shifting weenie. I also jet a tad rich and run 40:1 Maxima pre-mix.

One last note, my mechanic said my lower bearing was wobble-free.

[whodat]

yes. but your intercranial bearings have a severe wobble! you done with my head yet? all those insurance papers keep blowing off my desk.

[AZRickD]

Rick (from a WiFi node at a NW Ohio Captain D's Seafood Restaurant).

I'll be done with my worcation and back in Phoenix and ready to swap heads by Wednesday or so. We'll warm it up, test compression with your head, test compression with my new and improved head.

Only then will you see your precious GG head, Mister WhoDat.

[AZRickD]

Back from vacation.

I did two measurements using my analog dial calipers not the digital one I used before at the shop.

These are the numbers from both sides of the squish (I don't know if they were left or right).

.44 / .41 or 1.117mm / 1.041mm

.42 / .43 or 1.067mm / 1.092mm

I'll button it up eventually (it's freakin' hot in my garage).

Rick

[AZRickD]

I bolted it all together and had a failure to start -- sticky float and empty float bowl. I did notice a pronounced resistance to my kick.

Once the float was fixed, it fired on the first kick. Something tells me I'll be blowing a few more db at the next race.

Acceleration was vigorous in the Phoenix heat. Throttle response was quick.

[stay_upright]

Did you ever get results from a compression test?