Stroking a Dolmar 7900

[Fruecrue]

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/322414572059


I seen them on eBay. 1.5 mm thick. Great seller!

Thank you sir. I now have one inbound.

 

[stihl livin]

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/322414572059


I seen them on eBay. 1.5 mm thick. Great seller!

Anyone ever notice Daves user name on eBay ends in jms. Wonder if he’s related to the real jms?

 

[huskihl]

Anyone ever notice Daves user name on eBay ends in jms. Wonder if he’s related to the real jms?

Those are Julie's initials. Pretty sure we don't wanna go there

 

[Mastermind]

LOL

 

[Woodpecker]

Those are Julie's initials. Pretty sure we don't wanna go there

I'll play... who knew Dave's better half was so good with a belt sander

 

[Mastermind]

I'll play... who knew Dave's better half was so good with a belt sander

Repped

 

[Teemore]

You folk Stateside must have engineering suppliers who sell sheets of shimming material - something along the lines of these folk in the UK: https://www.stephensgaskets.co.uk/SteelShims.php

 

[Fruecrue]

You folk Stateside must have engineering suppliers who sell sheets of shimming material - something along the lines of these folk in the UK: https://www.stephensgaskets.co.uk/SteelShims.php

I like it. Wonder what a minimum order is.
We also have some very talented folks among our ranks that could produce and sell shims as well if the build catches on and is repeated.

 

[Teemore]

I like it. Wonder what a minimum order is.
We also have some very talented folks among our ranks that could produce and sell shims as well if the build catches on and is repeated.

First came across this stuff when sourcing parts for a vintage engine rebuild and was worried that a cylinder head skim might remove piston to valve clearances. The steel and stainless steel material gets used in conjunction with automotive head gaskets to put back piston clearance.

 

[huskyboy]

@Fruecrue did you end up using oem bearings or ceramics? Just curious.

 

[Fruecrue]

@Fruecrue did you end up using oem bearings or ceramics? Just curious.

Nachi

 

[mettee]

How do ceramics hold up over time

 

[huskihl]

How do ceramics hold up over time

Not worth a shìt so far in a chainsaw

 

[mettee]

I was thinking...

Ha, watch out. If you were to cut the squish enough to use a regular gasket, I wonder if you'd cut into the outer dome of the cylinder and weaken it. I'm curious if there is enough material in the upper cylinder to retain the strength after cutting the squish enough to allow the new stroke.

Obviously the thick gasket would void that concern.

 

[mettee]

Nachi

Do you have the part numbers for the ones you used? I know it's a 6203/6205, just curious what the unsealed part is.

 

[Fruecrue]

1mm of total travel isn’t enough to matter.
Some guys take much more out on certain saws on a standard build.

 

[Fruecrue]

Do you have the part numbers for the ones you used? I know it's a 6203/6205, just curious what the unsealed part is.

They come sealed, I remove the seals.

 

[mettee]

They come sealed, I remove the seals.

I found open ones on ebay just now.

They should have the metal cage correct?

 

[mettee]

I looked at these, gimic or decent?

http://www.microbluebearings.com/products/6203-Steel-Ball-Bearing.html

 

[Fruecrue]

I pay 1/10th of that. Find a local bearing shop.