Night of hell. Chaos.

[Gorminrider]

Ok,it's just me then, but I prefer no gas flooding out of my carburetors when tap is set to Prime. The bowls fill to a proper level and stop . If it doesn't stop, I will need to fix the carburetors, not the fuel tap. If however I had gas flowing into the oil sump via the vacuum line, I would suspect the tap's diaphragm.

Lucky me,my float level is settable. A small tab to bend...but Needle and seat would be my first suspects. If your carbs are much different, this won't help you I guess.

 

[Steve]

Actually I think this is pretty normal. Without the vacuum cut off the gas is supposed to flow freely. Perhaps your petcock needs a good cleaning? Also, on the carbs I have there is no real way to adjust the float. they come prefabbed to a certain height and sit freely. If they are out of spec, they are replaced, yeah?

OK there are a couple of things to clear up here.

1. There is no "vacuum cut off". The vacuum OPENS the fuel flow, it is a spring that pushes the plug back into place. Turning the petcock to the PRIme position mechanically pushes the plug open, allowing fuel flow.

2. If you have stock carbs, the floats ARE adjustable.

.

 

[gspower]

OK there are a couple of things to clear up here.

1. There is no "vacuum cut off". The vacuum OPENS the fuel flow, it is a spring that pushes the plug back into place. Turning the petcock to the PRIme position mechanically pushes the plug open, allowing fuel flow.

2. If you have stock carbs, the floats ARE adjustable.

.

Kind of what I meant with the vacuum line on the petcocks. Without the vacuum cut off, fuel flows through the petcock freely. Tomato, potato. As for the carbs, I saw no indication that they were adjustable. On my last set of carbs there was an adjustment screw. No such area on these. Not doubting you -- just curious.

EDIT: Answered my own question. There is no screw on my model, I just have to bend it to spec. When I checked the manual though, it states that the correct float level for all models is 25.6-27.6mm. For GS450 models, however, the correct level is 21.4-23.4mm. Mine is a 425, only manufactured for a year. Ermmmm .... ?

 

[megatwin]

I always bench test the carbs before I put them on the bike.
Put the carbs in a vice,loosely,and using a lawnmower fuel tank for a fuel supply,check the fuel level in the carbs,to about 1/8 to 1/4" below the gasket surface on the float bowls.

 

[gspower]

I always bench test the carbs before I put them on the bike.
Put the carbs in a vice,loosely,and using a lawnmower fuel tank for a fuel supply,check the fuel level in the carbs,to about 1/8 to 1/4" below the gasket surface on the float bowls.

I appreciate your suggestion but at this rate I would like it to be absolutely perfect. Maybe someone with a 425 or with knowledge of assembling this carb can tell me. The carbs have been totally disassembled, dipped in carb cleaner, sprayed with carb cleaner, otherwise cleaned, jets thoroughly inspected, floats replaced, gaskets and o-rings replaced. Not going to half ass it now that I'm on the home stretch.

 

[Gorminrider]

Your bike is nice but not that special. Neither are your carbs.The correct float level from the Clymer manual is indeed 26.6-27.6mm..

I appreciate your suggestion but....or with knowledge of assembling this carb can tell me.

I don't think you do appreciate it. Useful tips like megatwin offered will ensure you have done as much as you can "perfectly" before installing.It also aids comprehension. Disassembly,and cleaning alone doesn't ensure they will work.

 

[gspower]

Your bike is nice but not that special. Neither are your carbs.The correct float level from the Clymer manual is indeed 26.6-27.6mm..

The manuals make it really difficult to ensure that everything is right as they either cater to the 400 or the 450. There are minor changes between the 3 bikes, which is why I like to double check before I spend hours beating myself up over wrong information.

I don't think you do appreciate it. Useful tips like megatwin offered will ensure you have done as much as you can "perfectly" before installing.It also aids comprehension. Disassembly,and cleaning alone doesn't ensure they will work.

I do appreciate it. Realistically, though, I do not have a lawnmower tank just lyin' around to experiment with, nor do I really have the resources to do as megatwin suggested in my small rural shed, with no other alternative than to order parts and tools via the internet, as I don't have reliable transportation to do it myself. Additionally, my question pertained to the exact float level height, which wasn't answered. I have the utmost respect for the guys on this board and for anyone who helps me, for free, to complete my project. Thanks for the reply. It answered my question.

GSP

 

[snicrep5]

learn somethin everyday. never heard of the 425. looked it up, looks nice. never heard of spray silicone. 2 cents

 

[megatwin]

Well,you can use your fuel tank as a fuel supply.
Setting the fuel level,as opposed to setting the float level will give you a much more "perfect" result.
But then again,what do I know about a 425?

 

[tkent02]

I wouldn't use a Clymer mnual for setting any spec. What does the Suzuki manual say about setting the float?