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  #1  
Old 02-24-2007, 11:37 PM
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Jason Rose Jason Rose is offline
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Location: Hutchinson, Kansas
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Hedge trimmer troubles THT2100

I have an older (6 or so years old) hedge trimmer, model THT2100. YEllow sticker on the housing had a number of V065336, if that helps.

Unit is VERY tempermental. When it was newer it ran and always started fine, but in the past few years it's been giving fits. Often, if it takes more than a few pulls to get it to fire and run it will flood the cylinder and soak the spark plug with fuel. It will do this with or without the choke on. I had it in a repair shop last summer and they went thru it and had it running good but that was very short lived. within a couple uses it was back to running bad. By bad, I mean it seems like its running very lean. RPM's are extrememly HIGH at full throttle and has that "lean" sound to it. Only way to get it to run decent is to run at about 1/2 to 2/3 choke and keep off the throttle as much as possible.

Tonight I took the carb. apart and CAREFULLY cleaned it out, I replaced the main fuel line and found that the primer was broken. I removed the primer totally and plugged the elbow going into the carb. with a piece of fuel line crimped off and the same for the end going into the tank. After I reassembled it I was able to get it started right off and it ran perfect again. I ran it for several minutes with no problems, shut off and restarted a couple times. Went to start it again and now it's flooding the cylinder again... After the plug is dried it will sputter once when trying to start, but that's it. Is there some thing I need to do to get it to stop flooding the carb? Is there a repair kit for it? I also need the fuel tank breather, the one I have leaks. I'm not aware of any Tanaka dealers anywhere close to me! I kinda need this fixed soon, I use this for cutting pampas grass, and that's needing done quick!
  #2  
Old 02-28-2007, 08:28 PM
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Tanaka Tanaka is offline
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Response

Hi,

Sorry for the delayed response. Here are some thoughts from our tech guys....


It sounds like there are several things going on with this machine.

First, the carburetor sounds as though it's not holding pressure internally. This can be tested using a Walbro pressure tester. Short of having that tool, you're only choice is to replace the carburetor. Carbs with a primer have a high speed check valve, so replacement of both carb and primer is probably in order.

Additionally, it sounds like the other fuel components may be nearing the end of their service life. Keep in mind that all of those parts (tank cap, fuel lines, grommets, fuel filter), are very unforgiving. What I mean is they have to provide an air-tight seal, or gas will not adequately flow to the carb, as pressure within the tank is what feeds the fuel to the carb.

You didn't mention in your note, but you may have a build up of carbon in the tail pipe, or the actual exhaust port where the muffler attaches to the cylinder.

With six years of commercial service - most operators would be tickled. However, it may be a case where the unit is aged but hasn't accrued a lot of hours in use. It would be worthwhile to take a compression check using a screw in type compression gauge. The unit had roughly 130PSI when new. It would have severe starting and running problems less than about 105-110PSI. Low compression is simply the inability of the piston rings to seal against the cylinder walls, and is a function of normal wear.

If you're still unable to figure it out - give us a call. 1-888-482-6252


-MW
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  #3  
Old 02-28-2007, 10:12 PM
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Jason Rose Jason Rose is offline
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Thanks, I was actually able to get help from a dealer, but he was able to save me a good deal of money by getting a Walbro kit as opposed to a whole new carburetor, I spent less than $20 as opposed to the exact same kit from tanaka at $69, or the $80+ for a whole new carb. Yes, for that kind of money I'd just toss it in the trash and buy new. Of course I still had the primer bulb and the fuel tank breather to buy. $18 for a little primer bulb and almost $10 for a fuel tank breather. Of course both are available only thru Tanaka. Come on guys, that's ridiculous!!! I'm glad I found a dealer that also worked on other small engines and had sence enough to not stick me with "factory" parts for all of it.

Yes, this unit is old, but it sees very limited use. The only problems with it are the ones I mentioned, when it runs it's got plenty of power ect. But the diaphram in the carb was pretty crispy and not letting the needle valve close thus my flooding problem. The primer I took care of, cut it out of the line. I have other 2 stroke stuff that the primers have been split open for years and they run like a top!

Thanks for the advice of the pressure readings. I may give it a test just to see where it's at, but if it runs it runs, pressure readings don't mean much then.
  #4  
Old 03-06-2007, 11:09 AM
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Tanaka Tanaka is offline
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Prices

Hi,
Here are our suggested retails on those parts....

Our vent = $8.74

Our primer bulb = $7.19

Our carb kit = $19.43

-MW
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  #5  
Old 03-06-2007, 06:56 PM
Jason Rose's Avatar
Jason Rose Jason Rose is offline
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Join Date: Jan 2003
Location: Hutchinson, Kansas
Posts: 5,777
Quote:
Originally Posted by Tanaka America View Post
Hi,
Here are our suggested retails on those parts....

Our vent = $8.74

Our primer bulb = $7.19

Our carb kit = $19.43

-MW
Really??? Holy cats man, I guess that dealer was trying to clean me out! He said that the prices HE was goiving me was even less than "suggested list" and that the carb kit was still like $69 bucks!

Sorry for the harsh words then. I was "told" that the prices I quoted above was the Tanaka prices.

I still need the rubber parts though. the fuel line grommets and the rubber part of the fuel tank vent. Those are not sealing up well anymore. It's STILL not running right, well, it runs 100%, but getting it started is a pain. If it's cold it starts fine, if Iv'e had it running, shut it off for a few minutes and need to restart it, it floods out still. I'm not choking it or using the primer when it's warm or hot. If i let it sit for about 1/2 hour it will fire right up again... I just learned that if I need it again in a few minutes to just set it down and let it idle!

Any suggestions? (I did put a complete carb kit in it)
 

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