Sachs flooding problem

[teeko]

Make sure you are running good gas with low ethanol. I had a 1973 skidoo olympique and always ran premium gas. One day I got lazy and mixed a batch of regular grade gas from a cheap station and a few laps around the yard, it died. Had to rebuild the carb and replace all the intake gaskets. Ethanol eats rubber found on these older machines, not to mention, if it does run, it runs like crap. I'm surprized I haven't read more on this site about ethanol problems.

[Mpolly500]

Yeah I have good gas. I only use premium in any 2 stroke I own. I know what bad gas will do. I think we have all been lazy an found out what happens when you use rego or cheap gas

[North Country Tough]

When the machine is idling take a peak in the front of the carb there is a small piece of brass on a circle kinda venturi thing,is it spurting tons of gas out that would be the high speed check ball it replaces by removing the welsh plug.This thing can flood a motor if its not working proper,more or less its suppose to open at a certain venturi vacuum speed and is metered by the high speed needle,if it is gummed or stuck it flows all the time making the mixture way rich and loading the engine.Just a possibility if you are going to change it out find someone with experience you can easily mess a carb up if you have not changed one before.NCT

[Mpolly500]

Yeah I was worried about that I rebuilt the carb everything but the plugs. I've never done it before an dint want to ruin it. Looks like it's gonna have to go the the local shop

[North Country Tough]

If you were close to me I would help ya out I worked at many snowmobile dealers back in the seventys and repaired a ton of Tillotsons in my time and also screwed up a few changing the high speed orifice and it was a art form to remove and install the plugs I got good at it and it was easy,but anymore with a older two stroke one great upgrade would be a Mikuni carb with a remote fuel pump but it takes some carb tuning experience to get it right and some times some machining to get a adapter to fit it.Cheers NTC

[Mpolly500]

I would have already switched it if I could have. This motor is the reverse of any other motor I've messed with the pull start is on the left side an the clutch is on the right. I don't have room to fit any other carb. This one barley goes in.

[North Country Tough]

You did replace the needle and seat assembly didnt you?and when you did the inlet lever under the first diaphragm was it flush with the carb body ?and this carb does it have a external impulse hose running to the crankcase,if so is it dry ?

[Mpolly500]

Yes I did change the needle an seat. An yeah the lever is flush to the carb body an it does have the hose going to the crank case. It's brand new. By dry did you mean dry rotted or something else? The only thing left is those plugs. I do have another HR carb but it has different numbers on it. Will it work? I put it on once but the motor was already so flooded(I dint know this at the time) that it wouldn't start. I did notice gas coming out of the front though.

[North Country Tough]

Another hr will work good enough to tell but if it was spewing gas out the front it probably has issues too,the impulse hose I meant is it dry on the inside trying to determine whether it is pulling fuel from the pump diaphragm area,when you assembled this with the carb inverted (upside down) did you go gasket then diaphragm or diaphragm then gasket in the stack as you were assembling it.

[Mpolly500]

O ok. I haven't looked at the hose like that. I will though. An I used a diagram to assemble the carb back. The diaphragm(white piece) is against the metal then the black diaphragm then the actual gasket. Same in the next set of gasket/diaphragm set

[North Country Tough]

O ok. I haven't looked at the hose like that. I will though. An I used a diagram to assemble the carb back. The diaphragm(white piece) is against the metal then the black diaphragm then the actual gasket. Same in the next set of gasket/diaphragm set

From the base of the carb in other words where the needle and seat are it goes gasket then diaphragm and so on till you are done check out hr tillotson web site for a illustration I would put it on here but have no idea how,is this machine using a choke or has somebody put a primer on it ?

[Mpolly500]

I have the digram for the rebuild I'm 99.9% sure its right. It has a choke.

[North Country Tough]

Well in that case its pretty much a shoe in that you have a high speed check ball problem if gas is spewing in and the engine is in good shape otherwise and its flooding without being there I would say get that replaced,tell me this if you close the high speed needle and set the low speed correctly and let it idle does it still flood only at idle.

[Mpolly500]

It won't idle at all. I have to either keep feathering it or hold it wide open. When I rev it. It makes a bogging sound then opens. I can kind of slowing let the throttle down to almost an idle but it will just foul
My plug. The high seems to be fine. I had it wide open an tired the high screw in an it started dieing out. I had the low in almost all the way it dint seem to make a
Difference could the low check ball be stuck. Is there a low side ball?

[North Country Tough]

No low speed ball, all that is under that plug is drilled tiny holes that come out in the throat by the throttle butterfly,what I meant by closing the high speed needle was turning it all the way in and leave it that way and start it and see if it will idle,the reason I say that is if the high speed circuit is flooding IE:the high speed check ball is stuck open then you will have cut off supply to the check ball and if it idles without flooding then its likely the check ball if there is no change then its somewhere else.