Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Dolmar Makita => Topic started by: Cut4fun . on April 08, 2020, 07:37:57 am

Title: Dolmar 7300
Post by: Cut4fun . on April 08, 2020, 07:37:57 am
Dolmar 7300 back firing aka sheared key. Not needed. So cleaned up both sides lined up and tightened down. Coil gap imo to tight so just used my business card to reset gap. Fired right up and running.

Title: Re: Dolmar 7300
Post by: Cut4fun . on April 08, 2020, 04:02:24 pm
Test cutting and wont go full throttle.

Well this saw has more issues. New boot was installed at a shop. The dang flange is broke and someone tried using a wrong size nut and basically slides onto the carb bolt.   So only 1 side was even securing the carb.

So got it torn apart with a new little bolt that fits the carb bolt and trying to redneck it into the flange. If this holds tommorrow I wont need to order a flange and 2 square nuts. 

Carb was full of fines on both sides too. Dont appear to been apart for a long time.   Might need a carb kit too.

Least the H side limiter is now grinded off.

https://www.ereplacementparts.com/makita-dcs7301-73cc-chainsaw-parts-c-97_98_245_9468.html?osCsid=evbp2mj3j98lh6n8l7tq0ppuf6

https://www.sawagain.com/dolmar-ps-630-6400-7300-7310-7900-7910-makita-dcs-6400-7300-7900-carburetor-manifold-flange-new-oem-038171041/

https://www.sawagain.com/dolmar-ps-630-ps-6300-ps-6400-ps-7300-ps-7310-ps-7900-ps-7910-makita-dcs-6401-dcs-642120-dcs-7301-dcs-7901-rb-122-zama-carburetor-kit/



Title: Re: Dolmar 7300
Post by: Cut4fun . on April 08, 2020, 05:50:44 pm
 The nut you could basically slide on the carb bolt. New nut  one that least goes on right.

Redneck fix for the win. Test cut with 24 full skip and 8t. I would do a 7t myself.



Title: Re: Dolmar 7300
Post by: 3000 FPS on April 08, 2020, 10:15:18 pm
I do not believe I have ever seen a key shear on a chainsaw before.    That thing must have come to a stop pretty fast so that the momentum of the fly wheel sheared the key. 
Title: Re: Dolmar 7300
Post by: Cut4fun on April 09, 2020, 08:07:32 am
Saving info. Fly side crank.  He said he cut  m8x1.25 threads before reinstalling  and then shearing key.
 I think it was more of both surfaces wasnt cleaned good and fly not tightened good. Just my WAG

He also had used red loctite. Thanks goodness it didnt hold on nut.

Pic of threads before die used. They looked good when I seen them now. But was leery to tighten down like I normally do.