2 stroke engine in need of TLC

[Essex arborist]

Not a chainsaw but a 2 stroke motorbike engine that's been stored for several years, was running before storage.

 

I need to clean the fuel system is there a way of flushing the system without having to dismantle the whole engine?

 

 

 

 

 

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[agg221]

It depends a lot on what it is/how old.

 

You can usually flush from the tank to the carb on an old engine by taking the float bowl off and running a bit of neat petrol through. The bowl and gauze filters will need cleaning anyway. The taps may well have cork washers, which will need to soak a bit to soften up. Very little gets held above the float bowl, so unless it's clogged, it will clear any final oil residue once it starts running.

 

Oil residue in the crank case and exhaust - the easiest thing is to run it on Aspen and let it clean itself out. It will smoke a bit (a lot!) but will soon clear.

 

Haven't done this specifically on a motorbike, but have done several old Villiers 2-strokes (of the same basic type as found on motorbikes), with no issues.

 

Alec

[Essex arborist]

Thanks Alec - good advice.

 

 

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[Rich2484]

What agg has said.

 

But the only good way is to take it apart. I would remove the carb and dismantle to clean. Chances are the fuel has gone leaving oil residue in there.

 

Had a rotovator in last week that hadn't been run for a year. The carb was gunked right up with oil residue. Had to strip it right down, even removing the h and l screws and giving them a blast. Doesn't take too long once it off.

[hedgesparrow]

is it water cooled or air aspirated if water as recommended by eddie at aspen use aspen 4 with proper two stroke mix as looking to put in our modern two stroke mx bikes. if its air cooled the aspen 2 will be ok.

if its been stood up for a long time i would take carb off strip down and boil in a pot of water this takes all the crud out of carb and floats to surface when it looks clean skim muck off take carb out. let it cool down and rebuild. and then just clean out the tank and lines with fresh fuel poss changing fuel lines if hard and brittle. should then be ok

[wisecobandit]

And don't forget theres more than likely a filter on the tap bolted to the tank. Drop the tap out the tank and make sure that's clean and not gunked up.

[Essex arborist]

Some good advice all round there, cheers

 

 

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[peatff]

Has it been running premix or is it a modern engine with an oil pump ? Clean the float bowl out and blow the jets through with compressed air and carb cleaner and make sure the throttle slide moves freely in the grooves and the spring pushes it back down. I've been rebuilding a Lambretta for a while and just got it registered the other day, love the smell of two smoke

[mikerecike]

love the smell of two smoke

 

:lol:

[wisecobandit]

Castor r30 or r40 is smelling better than 2 stroke ;-p