|
|
Post by tjthechainsawmech on Mar 3, 2021 23:11:37 GMT -5
Hey guys, so I am having troubles with the tilitson carb on my xl-925. High end is pig rich even with the screw turned in. Further inspection of the carb lead me to believe the little Brass colored jet should have a check valve inside? Am I correct? I can see completely through this little jet and I can see what looks to be like a screen in there. From newer carb rebuilding I've known them to have a little rubber check valve in there.  20210303_175326 by TJ McCauley, on Flickr  20210303_175337 by TJ McCauley, on Flickr |
|
|
|
Post by kevinm1980 on Mar 4, 2021 8:58:27 GMT -5
Typically that is just a Welch plug, but the 925 and other xl-9xx saws have the hs151 which is governed, and that brass plug with hole and the brass flat blade plug by the choke lever are both parts of governer, at high rpm(venturi velocity) allows more fuel to be sucked in so you don't burn it up, homelite had a TSB on the hs151 that the high adjustment might have to be almost completely closed to make it run right,.you can block of the governer but taking out brass plug beside the cloke linkage and making a small gasket to go underneath then reinstall plug..there are YouTube videos showing process
|
|
|
|
Post by edju1958 on Mar 4, 2021 9:31:38 GMT -5
If you know how to set a carb properly (I know you know how to do this TJ) you can just get rid of the PITA HS151 carb & put a non-governed carb on like I did on my 925.I put an HS26 on it & it runs like it should.The only thing I found was that you'll need to put a needle grommet in it from an XL-923 as the needles are spaced differently.There are other carbs that you can use to replace the 151,I believe an HS96 will work & possibly an HS71 (?).All that needs to be done is make sure the venturi are the same as the 151.
|
|
|
|
Post by tjthechainsawmech on Mar 5, 2021 22:13:42 GMT -5
So here is the little brass jet I was talking about that might need a check valve.....reason I ask is cause when the carb is full of fuel it drips fuel into the throat. As you can see in the pictures you can see right though it. The screen is still there though. I'm gonna work on making a plug for the governor as well.  20210305_180544 by TJ McCauley, on Flickr  20210305_180622 by TJ McCauley, on Flickr  20210305_180628 by TJ McCauley, on Flickr |
|
|
|
Post by xl130 on Mar 6, 2021 6:10:00 GMT -5
Let us know how the Welch plug works out please. I have a few other saws that use a governor in the Hi spreed circuits that I have blocked.
A Welch plug fits under the brass insert located beside the choke valve almost perfect!however I used it once and had problems with the carburetor. I pulled the Welch plug and cut a disk out of a pop can. That works perfectly.
I’m not sure if switching the material was a fluke or not. I thought that possibly that insert needs to sit at a certain depth? There appears to be three passages down in there. Possibly fuel is allowed to flow through there and back to the carburetor if it’s not being drawn into the throat?
I just always use a pop can now though and am curious to hear you end up plugging it.
|
|
|
|
Post by blythkd on Mar 6, 2021 8:07:26 GMT -5
Somebody in our area years ago used to plug them up with Permatex Aviation Form-a-Gasket. Back in the day, I took several of them apart and cleaned them up.
|
|
|
|
Post by xl130 on Mar 6, 2021 12:58:08 GMT -5
Finally found this video. I knew I saw it at one time. Had to dig deep. Man this guy has a lot of videos. youtu.be/hrgFFFG2H-A |
|
|
|
Post by tjthechainsawmech on Mar 9, 2021 20:48:22 GMT -5
Finally got a chance to watch the video....I wonder where I could land a high speed nozzle. Mine is doing exactly that....dripping fuel out of that nozzle after shut down.
|
|
|
|
Post by onlyhomelites on Mar 9, 2021 23:39:30 GMT -5
|
|
|
|
Post by 5terrysupersaws on Mar 10, 2021 17:04:09 GMT -5
Is the 69453 Main Nozzle/Check-Valve for a VI-955 drilled ? |
|
|
|
Post by onlyhomelites on Mar 10, 2021 22:47:49 GMT -5
I'll be damned...good eye! They are NOT DRILLED! I thought all of the XL-92* saws had this mod...show's what I get for relying on my memory!
|
|
|
|
Post by 5terrysupersaws on Mar 10, 2021 23:48:12 GMT -5
I'll be damned...good eye! They are NOT DRILLED! I thought all of the XL-92* saws had this mod...show's what I get for relying on my memory! Thanks for checking, Leon ! I wasn't sure if they were drilled or not. I removed a nozzle( Tillotson: 363-518 ) from a HS-138-A carburetor, non-drilled with a plastic check ball, that resembled a Homelite 54444 nozzle used on early 921-23-24 saws. But couldn't find a pic that showed if 54444--->68284--->69453 was drilled . Pic of the non-drilled main nozzle from the HS-138-A carb. with a plastic check-ball same as the Homelite 54444.  |
|
|
|
Post by tjthechainsawmech on Mar 11, 2021 1:43:26 GMT -5
Thanks Leon! Yeah, I've been working on my own as well as a few others for customers so things have been nuts here haha That's a great idea and I've figured I'd try it in steps. Seems the most common is to plug the Governor itself but I'm curious about plugging this drilled brass jet and leaving the governor unplugged and seeing what happens. Worst case I'll be ordering that VI non drill plug from ya soon! |
|
|
|
Post by tjthechainsawmech on Mar 31, 2021 1:11:21 GMT -5
Alrighty gents, bumping this thread to keep updated. I received the check valve version of that main jet from Leon and I hope to give it a go tomorrow evening. I'll let you all know how it works out.
|
|
|
|
Post by tjthechainsawmech on Apr 1, 2021 0:39:44 GMT -5
Well I think I my have won this battle. Installed the new main jet and ended up plugging the governor as well and she runs pretty darn good. Cut some rounds and she's got some power for sure. Made a video of the saw running so I'll work on getting that uploaded soon.
|
|
|
|
Post by blythkd on Jul 30, 2021 21:16:00 GMT -5
So TJ, you installed the 69453 nozzle and that was the fix? I just pulled out an old 925 that I've ran before that I thought ran ok but not today. It loaded up something fierce at high speed with the HI needle all the way in. It would hardly idle with the LO needle out several turns, I didn't even count but probably 4 or 5. I was figuring crank seals or maybe a cracked intake was causing the idle issue but couldn't see why it was running so rich at high speed. The carb was clean and everything looked right. Checked stock and I had a new HS151B on the shelf so I put it on and the saw ran perfect. But like my son said, one of these days we might not have that option and will end up having to fix the old one.
|
|
