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Author Topic: Engine died... got leaky carbs?  (Read 2035 times)

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Offline lassenc

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Engine died... got leaky carbs?
« on: April 28, 2006, 04:33:16 PM »
I was running 105mph today, and the engine acted like it had no more fuel, I pulled over, and the engine died.

Couldn't start it up again, so I fiddled with the fuses and got it running, but then it started leaking from the tubes coming from the floatbowls, and running on 2/3 cylinders for a little moment, idle has changed a bit too, I don't get it.

How can an electrical problem be connected with my carbs flowing over?

How should I adress this problem?

I'll change all the fuses as a start ofcourse...
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Offline scunny

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Re: Engine died... got leaky carbs?
« Reply #1 on: April 28, 2006, 04:46:59 PM »
I would take a punt on your problem being carbs, you probably got some crap thru your fuel system-bike starved of fuel-while fiddling with electrics the carbs were filling. my thoughts anyway
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Offline scondon

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Re: Engine died... got leaky carbs?
« Reply #2 on: April 28, 2006, 04:48:48 PM »
Quote from: lassenc on April 28, 2006, 04:33:16 PM
I was running 105mph today, and the engine acted like it had no more fuel, I pulled over, and the engine died.

   Sounds like your carbs ran out of fuel. Possible crap in the tank or petcock screen. Float bowls filled while you were fiddling with the fuses and bike started back up but now you have gunk in the jets and a sticky float. Just a guess.

   105 mph has a way of breaking old gunk loose, I do it often to keep bike in tip top condition.

Quote from: scunny on April 28, 2006, 04:46:59 PM
I would take a punt on your problem being carbs, you probably got some crap thru your fuel system-bike starved of fuel-while fiddling with electrics the carbs were filling. my thoughts anyway

 I type too damn slow :D
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cd811

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Re: Engine died... got leaky carbs?
« Reply #3 on: April 28, 2006, 05:18:54 PM »
yea I say carbs...the fuse jiggle was black magic...ya might have gotten too much fuel...trash in float valve seat causing them NOT to seat...flood...puke...run like #$%*
solution...get trash out of your way and never, never run 105...lol... ;) :D ;D
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Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #4 on: April 29, 2006, 04:18:39 AM »
Well, one of my fuses did blow, it was all white inside, so :)
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #5 on: April 29, 2006, 04:27:59 AM »
Is the fuses by the way anything special, or are they available almost anywhere?
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

mbrock307

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Re: Engine died... got leaky carbs?
« Reply #6 on: April 29, 2006, 04:29:46 AM »
Quote from: lassenc on April 29, 2006, 04:27:59 AM
Is the fuses by the way anything special, or are they available almost anywhere?

As long as they fit and are the right amp rating....they should be fine
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Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #7 on: April 29, 2006, 04:34:44 AM »
Okay, thanks for the quick reply! :)

I guess I have to start on my first carb disassembling on the Honda :)
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

mbrock307

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Re: Engine died... got leaky carbs?
« Reply #8 on: April 29, 2006, 04:35:35 AM »
Quote from: lassenc on April 29, 2006, 04:34:44 AM
Okay, thanks for the quick reply! :)

I guess I have to start on my first carb disassembling on the Honda :)

been there, done that....if u run into any problems, pm me....   just put mine back together for the umpteenth time...lol
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Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #9 on: April 29, 2006, 04:39:51 AM »
It's just carbs, not that difficult, not on the other twostroke bikes I've had atleast :)
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

Offline scondon

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Re: Engine died... got leaky carbs?
« Reply #10 on: April 29, 2006, 08:30:33 AM »
 I've had good results using Yamaha carb cleaner mixed 1 to 3 with gasoline to clean carbs that were running fine but got gunked with debris from the tank. This is the stuff that is also used as carb dip(full strength), not the stuff you put in your gas tank. Drain float bowls, disconnect fuel line from tank and add mixture into the line until float bowls are full, let sit overnight, drain bowls and reconnect fuel line to tank. Same instructions are on the back of bottle which is available from Yamaha dealers.

  Since this stuff is excellent for cleaning disassembled carbs it might be worth a shot.
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Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #11 on: April 29, 2006, 01:04:28 PM »
Haven't seen this stuff anywhere, where do you get it?
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Offline scondon

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Re: Engine died... got leaky carbs?
« Reply #12 on: April 29, 2006, 03:12:58 PM »
Quote from: lassenc on April 29, 2006, 01:04:28 PM
Haven't seen this stuff anywhere, where do you get it?

   From your local Yamaha dealer. Same place they sell new Yamaha motorcycles.
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Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #13 on: April 30, 2006, 02:54:33 PM »
Well, I'll dissassemble those carbs, it's gotta be the floats that are sticty :)
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #14 on: May 01, 2006, 01:41:05 PM »
So!

Got new fuses.

Dissambled the carbs, put them together.

No gas leaks anymore.

Changed fork seals.

Now I've got oil around the topend, both sides only.

I'm thinking I forgot some supply of some sort?

The large tube from the head is connected with the filterbox thingie.

What can it be? Any supply lines I should know about? I've got no idea as I didn't open any part of the engine.

And I think it is very unlikely that I've got a HUGE headleak from taking off the carbs.

It runs as good as it used to, and starts even better, and has better idle.

It's only on the sides, and runs down the sides, looks like coming from the forks, though they are empty.
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #15 on: May 01, 2006, 01:58:38 PM »
So I'm thinking I connected the breather tube to the draintube from the airbox, though I didn't see any fitting on the airfilter box...

Edit:

Okay, apperently it's still leaking gas, but that's not my main concern any longer.

It looks like the oil drips from the oil bolt "CAP. B OIL PATH" (Partsfish name)

It makes two spots of  oil, on each side of the engine, I tried to feel if it was the bolt there, but didn't feel like there has been any thread ever cast into it.

Theres also oil on the front of the cylinder, on the bottom of the engine, I can't figure out where it is coming from...

I'm seriously on thin ice here...

NB. The breahtertube was correct connected...
« Last Edit: May 02, 2006, 12:07:53 AM by lassenc »
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #16 on: May 02, 2006, 07:07:59 AM »
Tappet cover had a little loose screw, they are tight now, and added a fuel additive.

Though I don't think that's the issue.

It is a huge leak, but I guess changing the topgasket would a good idea?
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

Offline Bob Wessner

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Re: Engine died... got leaky carbs?
« Reply #17 on: May 02, 2006, 08:15:57 AM »
Quote
Theres also oil on the front of the cylinder, on the bottom of the engine, I can't figure out where it is coming from...

Clean the area well, top to bottom, dry it and spray some foot powder around the area and, if ride-able, go for a ride. When you come back, the oil will wash off the powder and you can trace it back to the source. I used this trick (taught here  ;)) recently myself.
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Offline scondon

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Re: Engine died... got leaky carbs?
« Reply #18 on: May 02, 2006, 08:18:00 AM »
    Oil leaks are pretty common on old bikes that have been resurrected or ridden hard. Best to know exactly where the leaks are coming from before tearing into the engine to fix them. If oil is dripping from the bottom of the engine it could be coming from anywhere above. Clean the engine as good as you can and then start it up and see if you can trace the origin of your leak.

  What is the year and model of your bike? Here's the breather routing which should cover 75-78 750F? (US Model)
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Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #19 on: May 02, 2006, 03:06:44 PM »
Must be head and bottom gasket, forgot that the bike dropped by an accident on the headers, could be that.

So I'm taking off the head and cylinder.

Should I upgrade to 550 or 592 while at it?

Which O-rings and gaskets do I need for the operation, I have headgasket...

Edit:

CB500K3 is the bike :)
« Last Edit: May 02, 2006, 03:41:53 PM by lassenc »
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

cd811

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Re: Engine died... got leaky carbs?
« Reply #20 on: May 07, 2006, 12:44:16 PM »
ok...nobody is going to reply...why are you tearing down your motor for an oil leak?...is it nesessary?...where is the oil coming from?...did you look for the leak as suggested?...was it leaking before now?...before it fell over?...before you worked on carb?...I.m not trying to be a smartass, I just hate to see ya tear into a motor when ya ain't gotta..I was confused by your description of WHERE the leak was when ya started jumping from carbs to lines then forks then sides then airbox...just trying to help ;)
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Offline lassenc

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Re: Engine died... got leaky carbs?
« Reply #21 on: May 07, 2006, 12:52:26 PM »
The leak is EVERYWHERE on the topend, I can't define the place a 100%!

The carbs has no connection at all with any oil, therefore it can only be the fellover.

Parts are already ordered, and removing the head can't be that big a deal, as I've understood.

The oil is even on the rocker cover, and there are no oil over that spot, it can only be the gaskets...
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How exactly do you teach abstinence though?
It's like beating a dead cow, it's fun, but it doens't really get you anywhere.

cd811

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Re: Engine died... got leaky carbs?
« Reply #22 on: May 07, 2006, 12:57:20 PM »
k...I would suggest as you tear it down, see if you can find the culprit
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