Dolmar throwing chains

[Fatherwheels]

I looked up the parts diagram for the EA3201s chainsaw in the UK
and it shows the sprocket with the disk on it, the modified one,
looks like there was a problem with that model, but never heard of
a similar update for the EA4300. That 3201 will be a real odd ball
when parts run out as Makita are making no more gas saws after
the end of this year, the other models use a more common clutch drum.

 

[redhawk23]

It looks like a hybrid of a rim and spur sprocket.

 

[J D]

It looks like a hybrid of a rim and spur sprocket.

Nope, just a spur with a disk on the outside.
Fits Dolmar Ps-350, 351, 420, 421, 460, 510, & Makita Ea4300Fr, Ea4300F40B according to the website (sawagain)

 

[tomalophicon]

I looked up the parts diagram for the EA3201s chainsaw in the UK
and it shows the sprocket with the disk on it, the modified one,
looks like there was a problem with that model, but never heard of
a similar update for the EA4300. That 3201 will be a real odd ball
when parts run out as Makita are making no more gas saws after
the end of this year, the other models use a more common clutch drum.

Sold the saw a while back and replaced with an Echo.
There was nothing wrong with it after the new drum was installed.

 

[redhawk23]

I’d like to try that sprocket but I have 3 of the originals, 2 on saws and a replacement. Any suggestions?

 

[tomalophicon]

I’d like to try that sprocket but I have 3 of the originals, 2 on saws and a replacement. Any suggestions?

I'd go with the suggestion above regarding mounting a larger washer. Or even better brazing or welding one on to your existing sprocket.

 

[redhawk23]

I'd go with the suggestion above regarding mounting a larger washer. Or even better brazing or welding one on to your existing sprocket.

I don’t think there’s room. Maybe I could replace the washer thingy that’s there already (between the clip and the sprocket) with something larger?

 

[HarleyT]

Is the front stud the same height as the back one?

 

[redhawk23]

Is the front stud the same height as the back

Sold the saw a while back and replaced with an Echo.
There was nothing wrong with it after the new drum was installed.

I’d be interested in calling your Makita dealer

 

[HarleyT]

Instead of putting the sprocket coverback on, use a stack of washers to clamp the bar down, so you can visibly look at the geometry of the chain and sprocket.

 

[redhawk23]

Instead of putting the sprocket coverback on, use a stack of washers to clamp the bar down, so you can visibly look at the geometry of the chain and sprocket.

I wonder what the dimensions of the new sprocket are, if the height of the sprocket changed or remained the same. Adding to the height with a washer could cause problems I suppose.

 

[HarleyT]

Try what I said, so you can see the geometry of it, and you may see the issue. Use the washers as spacers to take the place of the sprocket cover's thickness.

 

[tomalophicon]

I’d be interested in calling your Makita dealer

Bunnings Australia. They are a big box. It would be a futile exercise attempting any contact.

 

[Fatherwheels]

Nope, just a spur with a disk on the outside.
Fits Dolmar Ps-350, 351, 420, 421, 460, 510, & Makita Ea4300Fr, Ea4300F40B according to the website (sawagain)

It must be a thinner sprocket area, then the added washer brings it up
to full width, otherwise how could you get the original washer and clip
to fit, there would be no room.

 

[redhawk23]

The washer that goes on the sprocket of the 421/4300 covers the Spurs. The redesigned sprocket has a sprocket “cover” built in plus it has a washer.

 

[redhawk23]

Try what I said, so you can see the geometry of it, and you may see the issue. Use the washers as spacers to take the place of the sprocket cover's thickness.

I put a a couple washers on but I don’t see anything

 

[J D]

I put a a couple washers on but I don’t see anything

I think Harley means run it like that & look for any wandering of the chain (wear gloves, chaps, helmet, visor etc)

 

[tomalophicon]

I think Harley means run it like that & look for any wandering of the chain (wear gloves, chaps, helmet, visor etc)

This is the best suggestion and it's free. I'd also measure the studs (maybe with a depth gauge on vernier calipers) like has been suggested.

 

[redhawk23]

Oh.

Based on the redesign, the chain probably gets stuck between the sprocket and washer when it’s pinched. I wonder if a rim sprocket would fix the problem?

I’ll contact Makita customer service and see if I can get them to part with a couple of the redesign. Maybe before I do that I’ll call one of their dealers and see if they know anything, Any dealers on this forum?

 

[HarleyT]

The tale kind of drops off quick.
How many teeth on the sprocket?
Does the bar have any writing/label on it?