A Tale of Two 288's

It was the best of builds, it was the worst of builds, it was the build of ease, it was the build of mistakes, it was a moment of triumph, it was a moment of humility, one was mild, and one was wild.

Stock
Exhaust 156
Trans 115 Blowdown 20.5
Intake 149

We'll start with the easy build... the mild one.
Cut squish band 0.020
Exhaust 160
Trans 122 Blowdown 19
Intake 159

Stock transfer


No one ever shows the progression of a port as they do it so I thought it would be neat to show the major milestones of a transfer port.
Lower transfer roughed in with large burr.


Lower transfer roughed in with small burr.


Lower transfer before sanding.


Lower transfer after sanding and blending.

Stock intake.




Finished intake.

Stock exhaust




Finished exhaust

All done.



You have to love the rough idle of these things. Pulling a 28" with a 8 pin, RSLK chain.

Just a little teaser of the wild build... WJ70 from a 394, 0.025" bigger main bore. I had to make a custom throttle roller.

Patiently waiting..... For... THE WILD!!

Damn fine looking work. That thing has plenty of torque!!!!

mx_racer428 said:

Patiently waiting..... For... THE WILD!!

Click to expand...

Have some opcorn: while you wait.

:coffee:

srcarr52 said:

Have some opcorn: while you wait.

Click to expand...

Bed time for this guy. Plan to take the snow scooter out tomorrow and head south from cr.. Will find out how bad the conditions really are.

Ok... wild numbers.

Exhaust 162
Trans 126 Blowdown 18
Intake 160

Mistake #1... went to high on exhaust on accident... somewhere around 168 so I had to take more out of the squish than to original 0.040" I wanted.
-0.070" on the squish with 2 extra angles to help smooth it into the combustion chamber.

Mistake #2: Ground out of the transfer port side and top... welded once... ground out again... ended up having to put a little epoxy on it. Sorry I didn't get a picture of the holes.

Finished transfer.



Mistake #3: Ground out the top of exhaust. A little more epoxy will fix the small hole (upper right). The flange has been welded to add more material to seal with.

Grrr! More problems. Now that the cylinder has dropped so much the carb won't clear the case. A little clearancing is needed.



Carb installed. I fixed the coil wire later... that crimp connector was bothering me.



Used a 395 choke pull because the 288 was not long enough. I still had to straighten out the bend of the 395 rod to make it work.

Muffler outlet. Big enough?



Screen installed.



Fits nicely under the high top.



Pushing 200 PSI before even starting... this thing is going to be a turd to start on a cold day.

1.8 seconds faster with same chains and bar. This one really pulls.

So which unit came from my honey hole??? Mild or Wild?

mx_racer428 said:

Bed time for this guy. Plan to take the snow scooter out tomorrow and head south from cr.. Will find out how bad the conditions really are.

Click to expand...

Must be nice... I have to work tomorrow. It's pretty crusty around here... I'd head north again. Anyway supposed to get some snow later tomorrow and Friday. Hopefully I'll get out for a bit on Friday and over the weekend.

nstueve said:

So which unit came from my honey hole??? Mild or Wild?

Click to expand...

Neither... that was a 181SE which will make a great 5ci play saw.

Great looking work. The mild one sounds great. I'm anxious to see how the wild one turns out.

blsnelling said:

Great looking work. The mild one sounds great. I'm anxious to see how the wild one turns out.

Click to expand...

I've already posted the video about 5 posts before this.