400.1 first impression

[bwalker]

Interesting to say the least. Either we figured out what they knew by chance, or they watched the forum.

View attachment 462299View attachment 462300View attachment 462301View attachment 462302View attachment 462303

Looks like the lightened up the conrod to take some stress off the crank bearings.
Also I am surprised to see the single butterfly carb.

 

[jurchybald]

It's a PITA saw to work on. You can see everything from this one pic

 

[bwalker]

It's a PITA saw to work on. You can see everything from this one pic

I have a 400C and its not a PITA to work on. I see the 400.1 one as basicly the same in that regard.

 

[farminkarman]

Interesting to say the least. Either we figured out what they knew by chance, or they watched the forum.

View attachment 462299View attachment 462300View attachment 462301View attachment 462302View attachment 462303

How did you get your paws on one of those?

 

[jurchybald]

I have a 400C and its not a PITA to work on. I see the 400.1 one as basicly the same in that regregard

Look at my photo again and imagine how you would cut the base on a lathe. Than add asimetric chamber design and imagine cutting squish by hand like I do. It has nothing in common with old 400 believe me

 

[Mastermind]

Look at my photo again and imagine how you would cut the base on a lathe. Than add asimetric chamber design and imagine cutting squish by hand like I do. It has nothing in common with old 400 believe me

Picture of the case where the transfer entrance sits please?

 

[farminkarman]

Picture of the case where the transfer entrance sits please?

Randy, check out the pics in Doc's post: https://opeforum.com/threads/400-1-first-impression.32705/post-1664939

 

[jurchybald]

Transfer entrance is way down in the case. Cilinder entrance is just part of a tunnel. That extension on cylinder has to stay there imo

 

[bwalker]

Look at my photo again and imagine how you would cut the base on a lathe. Than add asimetric chamber design and imagine cutting squish by hand like I do. It has nothing in common with old 400 believe me

In regards to porting you are probably right. Im sure the pro's will figure it out.

 

[Stump Shot]

Hoof Rasp

 

[cus_deluxe]

#beltsanderftfw

 

[Stump Shot]

Would like to see some of the rest of the "picture" so to speak, like the timing numbers and squish as it comes from the factory, along with the gasket thickness and extension gap to case measurement before trying to develop a plan of attack with the cylinder extension of this saw.
Some possible machining ideas come to mind but are hardly worth mentioning without the benefit of having an example in hand to ascertain just what can be done successfully and to the betterment of the machine.