Picked up a used BR 430 - wont start.

[Fish]

Is the primer/purge bulb hooked up correctly?

If you need the mechanic's manual, I can send you it through g-mail.

 

[StarTech]

I actually got a copy of a Stihl catalog from 2015 that listed the Zama kits RB numbers. But as Stihl is trying and do most times force independent shops to buy the kits from the dealers when the dealer is even willing to order them but most they only want to sell a whole carburetor. I most of my kits out Hong Kong from one of two suppliers. Besides the dealer here charges 20.11 for the RB161 kit and my source charged me 1.45 for the same kit. When I was able to get the kits from the Zama distributor the last kits were 6.52.

The BR430 here uses the RB161 per that catalog which is the same as the RB100 but Stihl has the complete carburetor kit listed as 7010 871 0222. Even these Stihl kit PNs is not list in the IPLs even though they are listed in the yearly technical reference guide. Currently I have the 2019 version.

As for the Mylar color they come in clear, blue, and black. What matters most is the shape and holes location.

Personally I think it comes down that Stihl doesn't want to stock the kits anymore nor do the dealers. It is also to note Stihl has scrub the Zama website of the carburetor IPLs that are used only on Stihl products too.

 

[Born2Mow]

If it won't hit, remove the plug again to check the compression. Even if you have to use your thumb over the plug hole.

The hard part about 2-stroke diagnosis is that bottom-end compression is just as important as top-end compression, but much harder to measure. Modern 2-strokes often have rubber seals on the main bearings, and when these go dry there is a loss of bottom-end compression that can prevent fuel intake.

 

[FredBacher]

Okay gents, here is where we are as of this morning. I can now confirm it is running, the throttle works, and its blowing a whole lot of air. The issue now though is that it will only do this when both the air filter compartment and the black bit that covers the carb are fully removed. I took the advice to add a little gas directly into the carb/spark to get it running. Nothing was happening so I ended up taking it off down to the carb to make sure the choke switch was working, it was. Gas added directly into carb, left it all apart, got it going. Was excited.

We have two videos to watch, both with sound if you click the audio icon in the link on the top right of the movie:
Link to video: Click here to get to the first video
Video 1:

https://imgur.com/a/oY805fk

This shows it running and pulling the throttle. Air blasting the leaves all the way down the driveway with ease. During this time I also picked it up and walked around a bit pulling the throttle. Worked well enough. Didn't test for too long but it ran for several minutes and never turned itself off.

Link to video: Click here to get to the second video
Video 2:

https://imgur.com/a/RSQYYwt

This shows adding back on the black cover and you can hear it start to struggle. If you pull the throttle while this is on it completely dies.

Blower will not start at all if both the black cover and orange air filter compartment are added. Remove all of it, like I have above, the blower will most likely start if pulling the starter cable and also trying to throttle up at the same time.

Edit: Had to fix the video links.

 

[PTmowerMech]

Okay gents, here is where we are as of this morning. I can now confirm it is running, the throttle works, and its blowing a whole lot of air. The issue now though is that it will only do this when both the air filter compartment and the black bit that covers the carb are fully removed. I took the advice to add a little gas directly into the carb/spark to get it running. Nothing was happening so I ended up taking it off down to the carb to make sure the choke switch was working, it was. Gas added directly into carb, left it all apart, got it going. Was excited.

We have two videos to watch, both with sound if you click the audio icon in the link on the top right of the movie:
Link to video: Click here to get to the first video
Video 1:

https://imgur.com/a/oY805fk

This shows it running and pulling the throttle. Air blasting the leaves all the way down the driveway with ease. During this time I also picked it up and walked around a bit pulling the throttle. Worked well enough. Didn't test for too long but it ran for several minutes and never turned itself off.

Link to video: Click here to get to the second video
Video 2:

https://imgur.com/a/RSQYYwt

This shows adding back on the black cover and you can hear it start to struggle. If you pull the throttle while this is on it completely dies.

Blower will not start at all if both the black cover and orange air filter compartment are added. Remove all of it, like I have above, the blower will most likely start if pulling the starter cable and also trying to throttle up at the same time.

Edit: Had to fix the video links.

Any sort of air restrictions changes the air/fuel mixture. Put everything back on and re-adjust. Adding an air filter, changes the amount of air that is going through the carb. Therefore you need to change the amount of fuel also.

That video does show a drastic drop in RPM's, in what shouldn't be much of a loss of air. When you install that cover, are you certain it's not accidentally closing the choke a little?

 

[FredBacher]

Please see this third video I went out and just took. It's a little messy as I was doing it all with one hand but once I have it all in place wait until the end and it all shuts down.

Click here for a link to the video

https://imgur.com/a/JNNmLd1

I also checked the black cover as you suggested, as far as I can tell it's perfectly aligned and not closing the choke at all when in place. It slide into a little slot in there and doesn't look to impact how the choke is sitting.

When you say readjust, what am I adjusting? The L and H screws?

When even just the black cover is in place it wont start at all. The screws have been adjusted all over the place it seems and I can't find out how to get them in any position to get it to even turn over when the covers are in place. Right now it's starting with only a pull or two each time.

 

[Fish]

Did you check and make sure your primer bulb lines are on correctly? Did you check the exhaust for blockage?

 

[Fish]

With it running with the covers off, see if you get some blowback from the intake.

 

[FredBacher]

With it running with the covers off, see if you get some blowback from the intake.

Sorry I am new at all of this still. What do you mean by this one? Isn't the intake the carb itself? What is blowback?

For the exhaust, I looked in there, on the big muffler over on the opposite side where all the exhaust gas shoots out, right? Doesn't look blocked or anything I guess.

As for primer bulb, short tube goes to carb, other tube goes into the engine or someplace. Not sure as I didn't follow it. Bulb looks like it's working as it fills with gas when running and when I push it prior to running I can hear stuff being sucked up into the carb.

 

[Fish]

The bulb can easily be hooked up backwards, It pulls gas through the carb, and then sends it to the tank.