Author Topic: Stihl HT 75 Flooding  (Read 975 times)

0 Members and 0 Guests are viewing this topic.

Offline ed

  • 3 cube
  • *
  • Posts: 17
  • Karma: 0
Stihl HT 75 Flooding
« on: March 31, 2012, 12:55:02 pm »
Hi, Have a Stihl HT 75 Pole saw that I let sit too long. Now it floods immediately when trying to start. I took the carb apart, cleaned everything put in fresh gas but no help, I noticed though a sealant? around what looks like some kind of pressed in plug was coming off. Don't know if this was just excess or is a problem. Found a rebuild kit and or a gasket kit but I,m thinking new carb. Anybody have any insight or advice? Thanks...Ed

Share on Facebook Share on Twitter


Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Stihl HT 75 Flooding
« Reply #1 on: March 31, 2012, 03:49:56 pm »
You have seepage from the pump side of the carb past the needle and seat of the metering valve into the metering chamber of the carb.

In other words, the metering needle is not holding. This could be caused by a stiff metering diaphragm?

You may try to tighten the plug to see if it stops the leak but I doubt that is your problem?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline ed

  • 3 cube
  • *
  • Posts: 17
  • Karma: 0
Re: Stihl HT 75 Flooding
« Reply #2 on: March 31, 2012, 04:43:36 pm »
Thanks for the reply 660. The tip on the needle seemed flexible. Hard for me to judge. Found some opinions on leaking "Welch" plugs which is what apparently what I was refering to in my initial post. They say it can be sealed with nail polish? I guess the ethanol in our new and improved gas formulations eats the origional sealant. Wonder how JB weld would hold up immersed in gasolene. New carb on ebay~$45.00 and never store with gas in the carb? Kind of a pain to do that to all my seasonal / infrequently used / collection of tools. ( 15+ 2 strokes) I do use Stabil and have had good luck with it. Maybe this one was just due to fail and wasn't bad gas as I initially suspected. Anyone else have good storage tips? Thanks....Ed

Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Stihl HT 75 Flooding
« Reply #3 on: March 31, 2012, 06:06:01 pm »
My storage tip is to never let it rain on my tools.

When I get done with them, I put them away with the gas in them. I've been doing that for more years than I care to remember. Back in the late 50's, I would see a little mud in the carbs but not in the last 40 years. I never had any trouble leaving gas in the carbs. I have trouble with filter fuzz in the carb screens sometimes.

I have to replace a metering diaphragm every once and a while. I have not experienced any check valve flaps curling up on the pump diaphragms.

I have a lot of yard tools and chainsaws.

I must be lucky with good gasoline in this area?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline Al Smith

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2743
  • Karma: 163
Re: Stihl HT 75 Flooding
« Reply #4 on: March 31, 2012, 07:41:36 pm »
Nail polish goes back decades for use as a sealant .

It's doubtfull the welch plugs are leaking .Most likely it just needs the carb rebuilt .You'll get maybe 4-5 years out of a rebuild if you run the tool on a regular bassis .Maybe 2-3 if you don't .The ethanol attacks the buna-n material the carb diaphragms and check valves are made of .Makes them stiff as cardboard .

A rebuild kit is usually pretty cheap .

 

Related Topics

  Subject / Started by Replies Last post
2 Replies
1297 Views
Last post March 21, 2011, 08:19:57 pm
by Cut4fun
2 Replies
598 Views
Last post March 29, 2011, 03:56:16 pm
by Cut4fun
066 Stihl

Started by man of stihl « 1 2 3 4 » Stihl

30 Replies
2031 Views
Last post September 27, 2015, 08:07:15 am
by Cut4fun .
1 Replies
664 Views
Last post May 13, 2011, 04:32:43 pm
by bloodontheice
Stihl 038

Started by Cut4fun Stihl

9 Replies
1768 Views
Last post September 30, 2019, 10:00:23 am
by Al Smith
5 Replies
395 Views
Last post February 13, 2013, 09:19:15 am
by bawtwblud
Husqvarna 372 flooding

Started by Cory « 1 2 ... 7 8 » Husqvarna

70 Replies
2250 Views
Last post March 18, 2015, 10:06:24 am
by srcarr52
3 Replies
273 Views
Last post August 29, 2013, 10:20:40 am
by Adirondackstihl
5 Replies
398 Views
Last post July 14, 2016, 08:22:07 pm
by Cut4fun .
6 Replies
90 Views
Last post November 17, 2017, 01:39:57 am
by Revpop