Stroking a Dolmar 7900

[huskyboy]

From what I’ve read, that method increases jet size and helps with part throttle and off idle response. I could be wrong.
Those are nice features but I really care about top end performance.
I had no trouble going rich at full throttle with the stock carb at a reasonable H screw setting and saw no need to increase jet size.
@Chainsaw Jim contacted me about the carb in PM but I don’t think it’s any secret that he did the work. I believe he was after the same top end performance as he saw I was, but I’ll let him speak on that, or not, at his discretion.
There is no doubt that his work was a noticeable gain over the stock carb.

I figured you were going for a more racey type build than a worksaw? Seems like still it has pretty damn nice torque from what I remember running it.

 

[Fruecrue]

I figured you were going for a more racey type build than a worksaw? Seems like still it has pretty damn nice torque from what I remember running it.

And real good manners too with that carb.
RWJ, not so much.

 

[mettee]

From what I’ve read, that method increases jet size and helps with part throttle and off idle response. I could be wrong.
Those are nice features but I really care about top end performance.
I had no trouble going rich at full throttle with the stock carb at a reasonable H screw setting and saw no need to increase jet size.
@Chainsaw Jim contacted me about the carb in PM but I don’t think it’s any secret that he did the work. I believe he was after the same top end performance as he saw I was, but I’ll let him speak on that, or not, at his discretion.
There is no doubt that his work was a noticeable gain over the stock carb.

Okay cool, I am just thinking about it and wondering really.

When reading the poleman tutorial there is mention of better performance, but I am not certain that it kick top end up a notch...

Would love to know for sure. And it is awesome to know what other carbs will work with a modded saw.

 

[mettee]

And real good manners too with that carb.
RWJ, not so much.

Which carb had good manners?

 

[Fruecrue]

Which carb had good manners?

Both the zama and the HD-12 did.
I’m trying to get the RWJ to idle down properly.

 

[Fruecrue]

Success!

 

[huskyboy]

Success!

Awesome! What you do?

 

[Fruecrue]

Awesome! What you do?

Soldered part of the throttle plate shut and drilled a couple jets.

 

[mdavlee]

Okay cool, I am just thinking about it and wondering really.

When reading the poleman tutorial there is mention of better performance, but I am not certain that it kick top end up a notch...

Would love to know for sure. And it is awesome to know what other carbs will work with a modded saw.

They do help top end. I had him do several for a 460. The modded Zama has the fastest cut times of any carb I tried.

The RWJ on the Solo 7900 I had was 4 turns out and still over 16k some days. I give up and put a 296 Tilly on it and it was great.

 

[Deets066]

Success!

Nice!


Now you can turn the H in, instead of out. Lol

Where you at on the H screw now?

 

[Fruecrue]

Nice!


Now you can turn the H in, instead of out. Lol

Where you at on the H screw now?

Both screws 2 turns off of their seats. I was pretty conservative with drill size.

 

[Deets066]

Did you pull the divider?

 

[Fruecrue]

Did you pull the divider?

No

 

[Fruecrue]

Tested the chain catcher today. It works.

 

[mettee]

Ouch man. Did it get you at all?

 

[redline4]

Tested the chain catcher today. It works.
View attachment 184385

Did it hit you?
I bet the angry muffkin was gnawin on it while you were in the house.
Either that or you got space beavers in your shop.

 

[Fruecrue]

Ouch man. Did it get you at all?

Nope

 

[RI Chevy]

F'bombs were flying I bet. That sucks Dave.

 

[Fruecrue]

Did it hit you?
I bet the angry muffkin was gnawin on it while you were in the house.
Either that or you got space beavers in your shop.

I don’t know which thought will give me worse nightmares.
Thanks a lot Ed.
GFY.

 

[Fruecrue]

F'bombs were flying I bet. That sucks Dave.

Nah, it was surprisingly calm and quiet once the saw was shut down.
Realization that it could have been bad.