GT500 carbs: Starter plunger is stuck

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GT500 carbs: Starter plunger is stuck

Post by GT500-2stroke »

1975 GT500:

One of the starter plunger ( is it also called choke ? ) is stuck inside the body.
The other one is moving inside and out freely.

I am trying to decide what are my options at this point?

1. Just try to get it working. But How?
2. Leave it alone, since the other one is working.
Will this approach work?
What are the compromises with this approach?
3. Just get a T500 carbs from eBay.
:
:

Appreciate any help..
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Re: GT500 carbs: Starter plunger is stuck

Post by GTandcbr »

You must persevere and free the stuck plunger. Try soaking it with carb cleaner or WD40. It will come free eventually.
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Re: GT500 carbs: Starter plunger is stuck

Post by GT500-2stroke »

GTandcbr wrote:You must persevere and free the stuck plunger. Try soaking it with carb cleaner or WD40. It will come free eventually.
Ok.
Also can you suggest a strong acid that can be used selectively only on plunger?
Which store might sell a strong acid?
What would be the name of acid?

Meanwhile I will continue to work with carb cleaner, vinegar, WD40..
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Re: GT500 carbs: Starter plunger is stuck

Post by GTandcbr »

Don't use anything corrosive unless you intend to replace the plunger as the bottom of the plunger has a rubber seal that will render it useless.
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dorT500
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Re: GT500 carbs: Starter plunger is stuck

Post by dorT500 »

GT500-2stroke wrote:
GTandcbr wrote:You must persevere and free the stuck plunger. Try soaking it with carb cleaner or WD40. It will come free eventually.
Ok.
Also can you suggest a strong acid that can be used selectively only on plunger?
Which store might sell a strong acid?
What would be the name of acid?

Meanwhile I will continue to work with carb cleaner, vinegar, WD40..


There is a thin rubber membrane in the bottom of the enrichment circuit's (how's that Rizingson? :wink: ) plunger. It may already be past saving but try a slow, gentle approach.
Image
I would not use ANY aggressive solvent on it. Actually, I would not even use vinegar. WD40 evaporates if you are just spraying so only soaking in a bath of the stuff will help.......maybe.

Purchase this at any auto parts supply or maybe Wal-Mart. There is a similar procduct with the brand name of Kroil or Kano AeroKroil. Spray it in there and let it sit all day and then spray it again and let it sit overnight....go all day again if you have to. Just remember, you may not be pulling on just the plunger but also that rubber membrane. Good Luck



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dorT500
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Re: GT500 carbs: Starter plunger is stuck

Post by dorT500 »

GTandcbr wrote:Don't use anything corrosive unless you intend to replace the plunger as the bottom of the plunger has a rubber seal that will render it useless.
ooops :oops: I was still typing away and uploading pics while you posted the second time. Sorry... I did not realize. :) You gave the good warning also.
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Re: GT500 carbs: Starter plunger is stuck

Post by dorT500 »

uh oh :| .....forget about what I said about using PB Blaster. I started thinking about it and realized I should have checked out if it was safe for rubber. From a quick search it looks like it IS NOT. Sorry about that, but in case you have never used them, it and Kroil penetrating oils are fantastic products for their intended use.
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Re: GT500 carbs: Starter plunger is stuck

Post by tz375 »

WD40 or PB are fine. You will replace the plunger anyway because the seal at the bottom is probably hard and worn by now.

The plunger can usually be carefully levered out or use a pair of needle nose pliers to turn it as you slowly pull the plunger out
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Re: GT500 carbs: Starter plunger is stuck

Post by GT500-2stroke »

GTandcbr wrote:You must persevere and free the stuck plunger. Try soaking it with carb cleaner or WD40. It will come free eventually.
Sorry, do you mean to say soak the 'entire' carb or just 'spray' on the starter assembly?
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Re: GT500 carbs: Starter plunger is stuck

Post by GT500-2stroke »

GTandcbr wrote:Don't use anything corrosive unless you intend to replace the plunger as the bottom of the plunger has a rubber seal that will render it useless.
Ok. got it.
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Re: GT500 carbs: Starter plunger is stuck

Post by GT500-2stroke »

tz375 wrote:WD40 or PB are fine. You will replace the plunger anyway because the seal at the bottom is probably hard and worn by now.

The plunger can usually be carefully levered out or use a pair of needle nose pliers to turn it as you slowly pull the plunger out
So far no success using WG40 and Carb cleaner, along with gentle tapping.

Think of using heat and cold.

What do you think about heat and cold?
Any other ideas?
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Re: GT500 carbs: Starter plunger is stuck

Post by Alan H »

Soak it all in diesel for a day or two. Great stuff for softening 'stuff' without hurting alloys.
Think of how stupid the average person is, then realise that half of them are more stupid than that.
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Re: GT500 carbs: Starter plunger is stuck

Post by GT500-2stroke »

Alan H wrote:Soak it all in diesel for a day or two. Great stuff for softening 'stuff' without hurting alloys.
Will try diesel.

Do you think applying heat is a bad idea?
( if diesel does not work i.e. )
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Re: GT500 carbs: Starter plunger is stuck

Post by Alan H »

Let the diesel soak for a couple of days first.
Think of how stupid the average person is, then realise that half of them are more stupid than that.
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Re: GT500 carbs: Starter plunger is stuck

Post by Evans Ward »

I'd hold off on the heat as you can easily damage/ melt the carb body. You have to be patient and give the penetrant some time to work on it's on.
1976 Suzuki GT750 (Maui Blue), 1972 Kawasaki H2 750 Mach IV (Candytone Blue), 1984 Yamaha RZ350 (KRR- Yellow/ Black).
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