GS450 Breather puking everywhere !!

[Guest]

So, I recently bought an '81 GS450s, lots of parts missing, had spark, put in new plugs, pulled the carbs, disassembled and cleaned them, reinstalled carbs, with cleaned and coated fuel tank, fresh fuel, new lines, inline filter. So, we got the bike running, took it for a few quick laps of the neighborhood and when we got back to the garage, the exhaust was exceptionally hot, anything touching the mufflers would sizzle (yes, you read that right, mufflers). Headers were hot too but, never seen mufflers that hot. So, it's idling in the garage, we blipped thr throttle a couple of times and all of a sudden, some goop starts puking out of the breather hose (pod filters, no airbox...airbox was missing when we got the bike). Not dribbling, puking it's guts out. Then slowed to a fast steady drip. Long story short, I changed the oil. Instead of aprox 3 quarts, out spilled over 5 quarts of something that was WAY thinner than oil, poured out like water. So, I got it from a guy who bought it as a project and never got to it, who bought if from a guy who bought it as a project and never got to it and so on. I'm wondering what came out of this motor, had a very light color and was lightly oily, but very thin. Can anyone think of what might have been in there? I'm thinking trans fluid or Marvel, things like that but they all have color. Would someone intentionally overfill a motor for storage reasons? Any ideas? Oh, bike got oil change, new filter as well, and seems to be running better. I have no idea how the muffler are doing though. There was some speculation that there might be an exhaust restriction causing the high temps, for example, critter nest in the muffler or rotted baffle that colapsed, so...the mufflers were cut off and cut open so...they're gone.

[78gs750e]

The carbs prob dumped gas into the oil while it was sitting its quite common on Suzuki's. Hopefully the gas did not hurt the stator.

[Nessism]

Either the petcock has failed and fuel is running down the vacuum line and into the engine, or the carbs are overflowing due to fouled float needles and filling the crankcase. Either way, you have fuel in the oil.

[kymasabe]

Hey guys, I appreciate the responses. I was wondering if the vacuum line was a problem so I disassembled and cleaned the petcock and when I hooked it back up, I used clear fuel line so I can see if anythings leaking back. For a while, we ran the bike with petcock on the "prime" position and capped the vacuum port on the carb and the petcock. If I'm having carb needle problems, Iwould want to rebuild the carbsif I have to go back into them. Didn't see much on eBay in way of carb kits. ANy suggestions on where to buy complete carb kits for the old '81 GS450S ??

[Steve]

Please do yourself and your bike a favor. DO NOT BUY CARB KITS.

If you are going to go through the effort to 'rebuild' the carbs, do it properly.

If you do it properly, you will only have to do it ONCE.

To 'rebuild' your carbs, you will likely only need an o-ring kit from cycleroings.com, new needles (and seats) and possibly bowl gaskets.
When you get your o-rings, be sure to also order the optional (for one penny) drain screw o-rings and the intake boot o-rings and stainless screws for the intake boots.

Then, go to BassCliff's "little" website and grab the GS450 Carb Rebuild Guide. Read the entire tutorial, then grab a can of Berryman's (or GUNK brand) carb cleaner dip and get ready for a couple days of intimacy with your carbs.

DO NOT TAKE ANY SHORTCUTS. Every shortcut you take only means one more time that you will have to take your carbs back off and re-do them.

Since you have hacked off your mufflers, the airflow capability of the engine has changed.
If you plan on keeping it this way you will need to re-jet the carbs. Please do yourself (and your bike and your community) a favor and get some mufflers back on the bike. Depending on what you put on, your re-jetting needs might be rather minnimal.

.

[kymasabe]

Steve, thanks for the good information. Regarding mufflers: Yes, I plan on putting something back on, I can't stand the loud pipes, gotta have something back there. I kinda like reverse cone megaphones that point up at an angle so will probably go that route.
Also, regarding the carb cleaner: I already have a gallon of the Gunk carb dip and a nice crock pot. You th ought the dip was good? Works even better when it's nice and hot in a crock pot.

[tkent02]

And the turkey soup your wife makes in a few days will be absolutely delicious!

A bit spicy perhaps, but delicious!

[kymasabe]

HA haaaaa funny. Yes, I've already been scolded for ruining a perfectly good crock pot so it's been marked and is designated for "shop use" only. No yummy turkey soup in the carb cooker.