Author Topic: Dolmar 111i carb  (Read 459 times)

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Offline 3000 FPS

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Dolmar 111i carb
« on: January 18, 2016, 06:50:17 pm »
I have  Dolmar 111i that has the injection type carburation.   The I stands for the injection type set up on it.
Well any ways there is no choke on this carb but it does have a lever that you still pull out that causes the injection to work.

Now Jim I know that you are pretty sharp on these Dolmars and was wondering if you could explain to me how this injection on this particular carb works.   The one I have does not appear to be working.   I have to prime the carb to get it started and it then works fine.
PP 505, 475, 445.

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Offline 660magnum

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Re: Dolmar 111i carb
« Reply #1 on: January 18, 2016, 07:43:23 pm »
The injector opens a fuel path from the pump directly into the throttle air stream. This time of year it's not unusual to get a one pull start with a cold engine. The engine will keep running with the injector on.

In the hot summer time they will usually quit before you can get the injector off. Then they start up with the injector off.

The carb is made by Tilly. I bought a new one back 4 or 5 years ago but they were around $75. My old one had a blown high speed check valve.
It would start and run OK but in the cut it would go rich.

There's also regular Walbro carbs for them but the choke lever is different.

Most 111i's came with a 15" .325 and 8 tooth. The 111i came out with a part time oiler in 1997. They were open port up through 1997 but after that they were closed port.

There was a latter 115 that was the same saw but with regular 7 tooth 3/8's, Walbro carb and closed port.

You will need to study the IPL carefully to pick up on all this.
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Offline 3000 FPS

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Re: Dolmar 111i carb
« Reply #2 on: January 18, 2016, 09:20:19 pm »
So is there anything that can go wrong with the injection path that can block the fuel from passing thru.   Maybe something I can take apart and clean.
PP 505, 475, 445.

Offline 660magnum

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Re: Dolmar 111i carb
« Reply #3 on: January 19, 2016, 02:59:44 am »
There's a little rotary valve in there and it can get full of lint or trash. It comes apart and is a cylindrical affair on the side of the carb. The choke lever directly opens the valve. There is a channel back to the pump chamber. The fuel does not go through the metering valve camber before it goes to the injection valve.


I remember reading about it somewhere, I don't remember now as that was 4 or 5 yrs ago. It was either in the 111 repair manual or the Tillotson manual for that carb?
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Offline 3000 FPS

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Re: Dolmar 111i carb
« Reply #4 on: January 19, 2016, 10:44:21 am »
Ok thanks Jim.   That is a lot more than what I knew before.   I will have to take it apart and see if it has accumulated any dirt in there.
PP 505, 475, 445.

Offline 660magnum

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Re: Dolmar 111i carb
« Reply #5 on: January 19, 2016, 11:05:25 am »
I also sent you the last ipl and a early SM which is somewhat brief in Gmail. I looked on Google for info on the HU83F carb but didn't find anything specific to the injector. I found a new carb for $98.
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Offline dannyupsolate

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Re: Dolmar 111i carb
« Reply #6 on: January 19, 2016, 11:44:59 am »
Got a 110i on the shelf needing carburetor rebuild. Was leaving it alone until I had a clue so thanks for info.

Offline 660magnum

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Re: Dolmar 111i carb
« Reply #7 on: January 19, 2016, 12:30:23 pm »
These were Makita & Dolmar's most popular saws back in the 90's and on up until about 2004. 5 years ago, used parts were all over the place but are getting harder to find now. The cylinders are no longer available from Dolmar. I have a good open port 111 cylinder if someone is in need. I also have a used coil. I also have a brand new closed port cylinder, piston, & rings but I want to hang on to them.

Using the 111i, it has more torque than the Stihl 026/MS260 but is slightly heavier.
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That knowledge can live after us... and that "Pays It Forward".
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