Cleaning gunk left from old float bowl gasket? - Honda Rebel Forum
 
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post #1 of 9 Old 08-04-2019, 04:57 PM Thread Starter
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Cleaning gunk left from old float bowl gasket?

Hi all! Post number 2...

Had a gas leak coming from the carb on a 2005 Rebel 250 I picked up a few weeks ago. (There was caked up fuel gunk all over the outside of carb and surrounding areas, so I figured there was a leak when I bought it...runs great overall, though, besides leaking and a bit of a sputter on the idle).

Anyway, I cleaned out the carb and ordered a new float valve and float bowl gasket, which should get here in a few days. The gasket was in really bad shape, so I am hoping that was the root of the problem.

I am wondering what (if anything) to do about a bit of orange/yellowish gunk left from the original gasket. After taking the gasket out, I tried cleaning it off with carb cleaner (pretty passively, mostly just sprayed and let it soak and rubbed with a tooth brush). However, the gunk mostly stayed there.

Any thoughts about how to remove this stuff? I'm not even sure what it is? Rust? Decomposed rubber? Old gas?

Photos:
1) With old gasket in place
2) Underside of old gasket
3) Without old gasket (a bit hard to see in the picture, but there is a little gunk left in the groove where the gasket fits into)
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post #2 of 9 Old 08-04-2019, 05:38 PM
 
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I believe it's rubber that has bonded with the surface of the part.


I just use a tiny screwdriver to *very carefully* scrape it away. It can adhere really tightly but you can get back to the metal with patience. I always seem to have tiny scratches where I've scraped but that doesn't seem to cause any issue. Obviously you are trying not to damage that channel your new gasket is going into.


And throw it in a sonic if you can.

1974 CB125S (purchased 1983, ate 2 crankshafts, sold 1984)
1986 Rebel 250 / N. California (purchased 2019)
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post #3 of 9 Old 08-04-2019, 06:16 PM Thread Starter
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Thanks for the answer leebrown66!

Quote:
Originally Posted by leebrown66 View Post
I always seem to have tiny scratches where I've scraped but that doesn't seem to cause any issue. Obviously you are trying not to damage that channel your new gasket is going into.
Yeah, I am a bit concerned about scraping up the channel, especially since I'm new to working on carbs. What do you think would happen if I left it there and just go ahead with installing the new gasket? Would it cause the gasket to sit improperly and lead to leaking, or would it be fine?
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post #4 of 9 Old 08-04-2019, 06:47 PM
 
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I'd be worried it wouldn't sit properly if that gunk was left in there.


I suppose a toothpick would pose little threat of scratching, maybe try that first.

1974 CB125S (purchased 1983, ate 2 crankshafts, sold 1984)
1986 Rebel 250 / N. California (purchased 2019)
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post #5 of 9 Old 08-04-2019, 08:55 PM
 
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go after that with a brass tooth brush sized brush (lightly) length ways in grove..
the burnishing and longitudinal scratching will help with sealing of new gasket..
scrape the stubborn spots with what every you chose as a pick

96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #6 of 9 Old 08-04-2019, 09:40 PM
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A used credit/gift card makes a good scraper for aluminum. Some carb cleaner in the groove may help loosen it.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
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post #7 of 9 Old 08-05-2019, 08:22 PM Thread Starter
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Thanks for the recommendations everybody! I went ahead and used a toothpick, which did the trick really well. As far as I can tell, it didn't leave any scratches, either. Now just got to wait for the gasket to come in the mail. For this particular gasket, there's no need to use anything as I install it right? i.e. I can just put it in and make sure it fits well and it's good to go, right?

Also, just noticed your signature flitecontrol *that's a great idea, thanks for the tip.*I just added my own. Let's see if it works...

I ride a 2005 Honda Rebel 250
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post #8 of 9 Old 08-05-2019, 09:22 PM
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A dab or two of Vaseline in the groove helps keep the gasket in place while assembling, but not critical.

Didn't think of a toothpick, but it's a great technique. Stiffness and friction to get the gunk, and no scratches.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #9 of 9 Old 08-05-2019, 09:26 PM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
A dab or two of Vaseline in the groove helps keep the gasket in place while assembling, but not critical.
Okay, good to know. Thanks!

Quote:
Originally Posted by flitecontrol View Post
Didn't think of a toothpick, but it's a great technique. Stiffness and friction to get the gunk, and no scratches.
Yeah, leebrown66 suggested it *was a great idea.

I ride a 2005 Honda Rebel 250
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