Stroking a Dolmar 7900

[Time's Standing Stihl]

Nice Dave.

So which one is getting a pipe?

 

[Fruecrue]

Nice Dave.

So which one is getting a pipe?

It will fit both.
I plan a relatively high exhaust on this one so..... why not!

 

[Fruecrue]

On that subject, I still haven’t checked port timing since changing the crank.

 

[Time's Standing Stihl]

It will fit both.
I plan a relatively high exhaust on this one so..... why not!

Better get that baby dialed in. I'm coming out a blazin' 1, 2 and 3

 

[mdavlee]

Better get that baby dialed in. I'm coming out a blazin' 1, 2 and 3

Did you bribe Matt and John Reilly?[emoji23]

 

[Time's Standing Stihl]

Did you bribe Matt and John Reilly?[emoji23]

No and no. I'm too low on the totem pole for dat

 

[David Young]

Wonder where the numbers ended up. Looking good dave

 

[Fruecrue]

Better get that baby dialed in. I'm coming out a blazin' 1, 2 and 3

Bring it Clint.
Hoping this year is more intense than the China saws.

 

[Intoxsawcated]

On the 372/390 I was thinkn about putting the entire 390 into the 372 cases. Itll take some machine work. Hoping to do some mock ups next week. I just wondered if it had been done b4.

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I was thinking the same thing on my 372. I have a 390 crank but have discovered the weights are 2mm wider total, offsetting the rod and weight towards the pto side. Thats about as far as I've gotten. Total width between bearings and total shaft width is the same. Centering everything looks like a bit of machine work on the crank and the case needs opened up a bit for the crank, then do you use 372 bearings or bore the case for the bigger 6203 bearings? I think stroking a 372 crank might be a better way to go with a new rod and bigger small end or ditch the bearing and use a bronze bushing. It's a bit more work than I can handle by myself at the moment. Custom crank?

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[moparnut88]

I was thinking the same thing on my 372. I have a 390 crank but have discovered the weights are 2mm wider total, offsetting the rod and weight towards the pto side. Thats about as far as I've gotten. Total width between bearings and total shaft width is the same. Centering everything looks like a bit of machine work on the crank and the case needs opened up a bit for the crank, then do you use 372 bearings or bore the case for the bigger 6203 bearings? I think stroking a 372 crank might be a better way to go with a new rod and bigger small end or ditch the bearing and use a bronze bushing. It's a bit more work than I can handle by myself at the moment. Custom crank?

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I am gonna use 372 bearings and machine crank. Looks like just slot the cylinder holes. I've got a 385 cylinder and pistons that's what I'm gonna use first b4 I buy a 390 cylinder. I did lay eyes on one that has been built. It was def a screamer. Porting numbers were different than normal. I'll have to play around with that. But was encouraging to see that at least one has been built. Albeit a race saw.

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[tickbitintn]

Starting in the cut.
20” full comp, 8 pin.

Looking good my friend!

If you throw a couple more keys on that chain you could add a couple inches on the bar and chain..... For better balance and stuffs....
Lol


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[mettee]

This really makes me want to grab a solo crank and start this on mine...

 

[Fruecrue]

This really makes me want to grab a solo crank and start this on mine...

You should have bought one a few weeks ago and you’d have it already.

Slacker.

 

[Deets066]

Better get that baby dialed in. I'm coming out a blazin' 1, 2 and 3

You runnin one with no machine work?

 

[Time's Standing Stihl]

Yup. Stock

 

[Fruecrue]

Yup. Stock

Stock?



Not familiar.....

 

[Time's Standing Stihl]

You runnin one with no machine work?

Regardless, I don't believe that is in the rule book this year

 

[Time's Standing Stihl]

Stock?



Not familiar.....

Likewise

 

[Deets066]

Regardless, I don't believe that is in the rule book this year

Really? What’s the difference from class 1 to class 2

 

[Time's Standing Stihl]

Really? What’s the difference from class 1 to class 2

Chain. Then 3 is stroke