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Offline Stusmoke

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CR125 carby leakage
« on: July 04, 2012, 12:35:22 PM »
First off: Sorry for my inactivity

Now after replacing the head gasket and base gasket on my 2001 honda CR125r, it is now urinating fuel out of the carby overflow valve. Atleast I believe it to be an overflow valve. I never even touched hte carby when doing my work its just completely random it wasn't doing this before. I'm getting the feeling its cos its not going to the cylinder. THe engine wont start either hence my inference of not reaching the cylinder.

Thanks for any help guys. Its gonna be something so stupidly simple that slipped my mind.

it was definitely NOT doing this before
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline msmola2002

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CR125 carby leakage
« Reply #1 on: July 04, 2012, 01:16:48 PM »
That right there is sticking needle and seat - the float is not closing the flow off.

give it a sharp hit and see if it stops, if not pull the bowl and make sure there is nothibg in the seat, or the rubber tip f theneedle is in good shape
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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CR125 carby leakage
« Reply #2 on: July 04, 2012, 02:29:00 PM »
Rgr that. Cheers and I should also note that when you twist the throttle the carby makes a scratching sound at a certain point so I think you're on the money. Thanks mate
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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CR125 carby leakage
« Reply #3 on: July 05, 2012, 04:08:01 AM »
Hmmmm... So after fixing the needle issue by bashing it, the engine is still refusing to run. Turns over fine and its definitely getting spark. I know this cos i wasn't concentrating when I kicked the engine over. I had the plug in my hand. Jolted me several times hahaha.

So its gotta be something in the fuel system somewhere. I'd rather hear some suggestions before I go tearing the carby apart though :P

Thanks everyone I appreciate the help
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline TMKIWI

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CR125 carby leakage
« Reply #4 on: July 05, 2012, 08:15:14 AM »
Strip the carby.
It is good practice to clean the carby after every rebuild.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
If you don't fall off you are not going hard enough

Offline Stusmoke

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CR125 carby leakage
« Reply #5 on: July 05, 2012, 08:55:25 AM »
Strip the carby.
It is good practice to clean the carby after every rebuild.

I did a basic teardown of the carb today but something else is that the genius who had the bike before proooobably never cleaned the air filter in the filters life. So I washed that today. But it also wasn't pushed down properly and the intake was a little exposed so its a safe bet somethings gotten clogged. Anyway I've got my detailed manual and a fair bit of spare time so tomorrow is carby teardown. Should be fun   :<img src=" title="Roll Eyes" class="smiley">
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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CR125 carby leakage
« Reply #6 on: July 09, 2012, 07:59:32 AM »
*bump*

Well I cleaned the begeezus out of the carby, everything was all sweet there no need to replace anything. It was relatively clean too. I also uncovered the source of that scratching sound I mentioned when you twist the throttle? The spring collar was stuck down around where the throttle cable hooks up and wasn't inside the spring anymore.

To the issue at hand: Backfired.

Its getting fuel at least, so thats a level up for me but when I installed a new spark plug yesterday in an effort to solve what I thought was a lack of spark issue, it backfired on me. Atleast I assume the loud CRACK noise that it made that almost made me shat my pants and fall off the bike was backfiring.
So whats the thoughts fellas? Incorrectly timed Ignition?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline cnrcpla

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CR125 carby leakage
« Reply #7 on: July 09, 2012, 03:28:27 PM »
The only way to find that out is to test the timing. Reffer to a manual, I THINK they explain how to do it, but I could be wrong. If you don't find it, I'm sure someone on here knows.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline 2T Institute

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CR125 carby leakage
« Reply #8 on: July 09, 2012, 10:38:07 PM »
Buy timing light, dial gauge and spark plug adaptor report back when you have those.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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CR125 carby leakage
« Reply #9 on: July 10, 2012, 11:01:27 AM »
Before I go out spending god knows how much I had another thought.

When I was taking the cylinder off, I noticed the line from the ignition coil/stop switch was a little exposed in that it didn't have rubber insulation around it. So with that in mind, I remembered a few things that seemed insignificant at the time. First, I got my cousin to hold to spark plug by the rubber pieces out of the way of the cylinder head to guard against the fumes igniting. The first spark and he jolted something chronic. It must've been a pretty serious whack. The next ones after that were extremely weak and barely noticeable even when holding the sparkplug itself. When I checked it today, there was no spark whatsoever.

With this in mind, is it possible that either the ignition coil itself is dodgey and having intermittent faults or could it be that the wiring attachments are loose?

Thanks guys, I appreciate taking the time to help me out.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline nom de guerre

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CR125 carby leakage
« Reply #10 on: July 10, 2012, 12:20:13 PM »
Maybe the plug wire itself is bad? Ground clean and proper contact?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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CR125 carby leakage
« Reply #11 on: July 11, 2012, 08:50:02 AM »
now the plug is only sparking if I'm touching the plug itself and kick the engine over. If it has to touch something to generate spark then my bad but I've never had to touch it to anything before, I think.

I've checked everything: exhaust valve mechanism, carby everything that could've POSSIBLY gone wrong while I was taking the cylinder off. I didn't touch anything else and it was definitely working fine before.

What could've possibly gone wrong in the time that I was doing my stuff? It must be something brutally simple that I've missed.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Stusmoke

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CR125 carby leakage
« Reply #12 on: July 13, 2012, 02:02:10 AM »
*bump*

Anyone got any ideas?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline msmola2002

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CR125 carby leakage
« Reply #13 on: July 13, 2012, 03:17:36 AM »
The plug won't spark unless it is touching the engine or frame. You are generating a current, which needs to go to ground. It can't go to ground if it is not touching the bike somewhere.

So, if you have spark then - there are only 2 possible explanations.
1) Fuel (or lack thereof)
2) Timing of spark.

To rule out 1), invest in can of aerostart/start ya bastard/ether in a can. Spray liberally, kick. If it does not at least pop or something, 2) is looking to be a good option. If it pops and farts and bangs and sounds vaguely like running, you have a fuel issue.

For number 2
Quote
Buy timing light, dial gauge and spark plug adaptor report back when you have those.
- This guy, he knows. The proper way to troubleshoot an issue like that is proper tools! Find TDC and go from there.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline 2T Institute

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CR125 carby leakage
« Reply #14 on: July 13, 2012, 12:12:26 PM »
*bump*

Anyone got any ideas?

having the plug ungrounded and kicking the engine over is great way to find out how much 'smoke' is contained in the CDI box.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »