Spooging 2 stroke. Mechanic?

[matrox02]

From memory the rmx's that had the mikuni with the combined choke/idle circuit were terrible to set up even when new.
Swapping for a pwk was common and thats what I would do now. Even better go for a lectern carb and forget about jetting again!

I'm taking you are talking about a lectron jetless carb?, looks like a 36-38 should fit and maybe I will go for that... But I'll do some more fluffing around first

[F5 Dave]

So what does it run like on just opened throttle? Clean or a bit blubbery at first? Try next pilot down, it could just be rich at closed to just opened throttle which the needle won't fix. Idle mixscrew will be richer as turned in.
Rich jetting will produce spooge, not the oil so much.

That said do check the needle valve with a bright torch. Any ovality will mean globuals of wet fuel. Any.


Us jetting specs won't be the shizlle on our fuel.

[matrox02]

So what does it run like on just opened throttle? Clean or a bit blubbery at first? Try next pilot down, it could just be rich at closed to just opened throttle which the needle won't fix. Idle mixscrew will be richer as turned in.
Rich jetting will produce spooge, not the oil so much.

That said do check the needle valve with a bright torch. Any ovality will mean globuals of wet fuel. Any.


Us jetting specs won't be the shizlle on our fuel.

Its a bit blubbery at first actually, you need to give it a few revs to help it out before trying to move off, once moving it really moves well, I'll see if adjusting the mixture screw helps a bit first, I set it and really haven't touched it as I'm scared of seizing it but at this point I don't think it will with all the oil it has

[gwynfryn]

I'm taking you are talking about a lectron jetless carb?, looks like a 36-38 should fit and maybe I will go for that... But I'll do some more fluffing around first

Contact these guys if your serious http://www.motosportz.com/lectron.html they will be able to advise on fitment .
Pwk will be cheaper though.

[scott411]

Its a bit blubbery at first actually, you need to give it a few revs to help it out before trying to move off, once moving it really moves well, I'll see if adjusting the mixture screw helps a bit first, I set it and really haven't touched it as I'm scared of seizing it but at this point I don't think it will with all the oil it has

sounds like the pilot jet is too rich with that discription, not much chance of seizing the bike by altering the pilot jet, try 1 size down, the mixture screw only really does the very bottom of the throttle range,

FMF jetting specs are ball park, but we have different fuel and atmosphere conditions down here,

[matrox02]

sounds like the pilot jet is too rich with that discription, not much chance of seizing the bike by altering the pilot jet, try 1 size down, the mixture screw only really does the very bottom of the throttle range,

FMF jetting specs are ball park, but we have different fuel and atmosphere conditions down here,

Will the Pilot also effect the idle setting as i noticed that i have to have the idle screw almost all the way in for it to idle?? I suppose because its flooding it?

[F5 Dave]

Totally, you are describing rich pilot, an affliction every dirt bike I've owned has had until fettled. There are reasons they set them up like this from new. But a bad compromise for most.

Previously I've jetted that cct by going down in pilot until you can blip it from idle and have it falter when you blip it from low revs closed throttle. You wind the screw in until it no longer falters. You now have it perfect for this but too lean for under load (riding) so it needs to be a bit richer, but at least you know what is too lean. More applicable for trials bikes.

But I'd just go down one size pilot and twiddle the screw till it runs best.
Remember jetting a slide carb you are concentrated on throttle position not revs. Write this down and stick it to the tank. If you start using expressions like `down low` - slap youself. CV carbs are different.

But do check the needle and jet it runs in for ovality. Vibey bigger bore bikes wear carb parts after a decade.

[scott411]

Totally, you are describing rich pilot, an affliction every dirt bike I've owned has had until fettled. There are reasons they set them up like this from new. But a bad compromise for most.

Previously I've jetted that cct by going down in pilot until you can blip it from idle and have it falter when you blip it from low revs closed throttle. You wind the screw in until it no longer falters. You now have it perfect for this but too lean for under load (riding) so it needs to be a bit richer, but at least you know what is too lean. More applicable for trials bikes.

But I'd just go down one size pilot and twiddle the screw till it runs best.
Remember jetting a slide carb you are concentrated on throttle position not revs. Write this down and stick it to the tank. If you start using expressions like `down low` - slap youself. CV carbs are different.

But do check the needle and jet it runs in for ovality. Vibey bigger bore bikes wear carb parts after a decade.

very good advice here, i have seen alot of people over the years try to jet down kids or ladies bikes to try adn stop them fouling plugs, they always go main jet first, but the kids dont usually open the throttle to above half anyway, most fouling plugs is because of to rich idle and pilot circuits, you can get the pictures off google that shows what each jet does,

[matrox02]

Totally, you are describing rich pilot, an affliction every dirt bike I've owned has had until fettled. There are reasons they set them up like this from new. But a bad compromise for most.

Previously I've jetted that cct by going down in pilot until you can blip it from idle and have it falter when you blip it from low revs closed throttle. You wind the screw in until it no longer falters. You now have it perfect for this but too lean for under load (riding) so it needs to be a bit richer, but at least you know what is too lean. More applicable for trials bikes.

But I'd just go down one size pilot and twiddle the screw till it runs best.
Remember jetting a slide carb you are concentrated on throttle position not revs. Write this down and stick it to the tank. If you start using expressions like `down low` - slap youself. CV carbs are different.

But do check the needle and jet it runs in for ovality. Vibey bigger bore bikes wear carb parts after a decade.

pH, thank you for that I'll ring Coleman suzuki see if they have and get one
Maybe I won't get a lectron just yet, but I have enquired through an ausy bloke who is a listed distributor

[F5 Dave]

Thanks Scott. Whites or erm can't remember the other will be able to get the jets just deal with your local if they are any good. Cheap to source. Kiehin slides are another matter.

[scott411]

Thanks Scott. Whites or erm can't remember the other will be able to get the jets just deal with your local if they are any good. Cheap to source. Kiehin slides are another matter.

northerns will have genuine mikuni ones, and R2 do them as well, any bike shop should be able to get them for you,

MR Motorcylces in Puke used to stock them, but unsure if they still keep the jet boxes full,

[matrox02]

So I ordered and Picked up the 42.5 jet ( the next leanest from 45 ) and when picking it up the guy at the counter kept going "thats really lean, are you sure nothing else is wrong??" which has me a bit worried, Havnt installed it yet, still yet to pull the carb apart and check that the fuel bowl valve is fine and not out of round but will do soon

[F5 Dave]

So in mikuni 50 is the biggest available. If 45 is std then its one step to 42.5.

[scott411]

So I ordered and Picked up the 42.5 jet ( the next leanest from 45 ) and when picking it up the guy at the counter kept going "thats really lean, are you sure nothing else is wrong??" which has me a bit worried, Havnt installed it yet, still yet to pull the carb apart and check that the fuel bowl valve is fine and not out of round but will do soon

I dont think its that lean, we used to run down to 32.5 ' s in some bikes with Mikuni carbs,

[matrox02]

Just an update installed the new 42.5 pilot, and checked the float valve, the needle is mint and so is the hole the gas passes through, put everything back together but haven't fired it yet, was way too tired to bother kicking her over haha, will update once I have though