Will it run again.?

**FROSTY:Me** · 24th March 2008, 16:25

take 1 x single cylinder 4 stroke motorcycle-Sump capacity 1.0l of quality oil
Add a nasty split in the back of the petrol tank which by a horrible desighn fault drained fuel into the airbox.
Filling that up to the baffles then drains the air box load of fuel via the crankcase breather into the bikes sump.
Keep adding fuel until there is 3l of fuel in the sump.
Ride said motorcycle till it stops
Drain sump contents to find NO oil just a slightly oily 3.0l (or so) of fuel (mower fuel anyone?)
Concider the options.
Cause of problem is pretty clear.
Damage done --will it run with just fresh oil added?
Bigends fucked?
Crank bearings fucked.
Bore a scratched mess of pigiron?
_Ohh said bike still turns over

**The Pastor** · 24th March 2008, 16:31

Give it a go whats the worst that could happen........

**tri boy** · 24th March 2008, 16:31

It'll go again, but I would expect some damage. (maybe even a bent rod if it hydraulic ed)

**Ocean1** · 24th March 2008, 16:46

Run?

Probably, but why would you bother, an afternoon would see the wee beastie stripped and bearings don't cost much.

Worst case the bore's fucked, then you need to make a call as to if it's worth the cost. Iron bore? meh, find the biggest piston that'll fit and bore it out to suit. While you're there you moght as well stroke the damn thing as well.

**FilthyLuka** · 24th March 2008, 16:48

Originally Posted by Ocean1

Run?

Probably, but why would you bother, an afternoon would see the wee beastie stripped and bearings don't cost much.

Worst case the bore's fucked, then you need to make a call as to if it's worth the cost. Iron bore? meh, find the biggest piston that'll fit and bore it out to suit. While you're there you moght as well stroke the damn thing as well.

Would be kinda hard seeing as the owners collection of tools was found under the seat of the bike (no offence)

**Mike748** · 24th March 2008, 17:03

So long as it wasn't being thrashed to buggery before it stopped? then I don't see why not, it should be nice n clean like it's had one major engine flush.
Wear would depend on how long has said ovefilling been going on.

**Ocean1** · 24th March 2008, 17:04

Originally Posted by FilthyLuka

Would be kinda hard seeing as the owners collection of tools was found under the seat of the bike (no offence)

What, exactly are we talking about here?

Don't need much to strip yer average baby thumper...

**jonbuoy** · 24th March 2008, 17:10

Top it up with cheap oil and see what it sounds like?
Edit - I had a similar problem with carbs filling the engine up with petrol in the past, engine choked itself to death on the super rich mixture before any serious engine damage happened.

**Henk** · 24th March 2008, 17:15

Originally Posted by jonbuoy

Top it up with cheap oil and see what it sounds like.

What he said. After all at this stage, what have you got to lose?

**Squiggles** · 24th March 2008, 17:16

EJ's bike is in a not so good state then :bugger:

He might be looking at that $700ish motor on tardme sometime soon then?

**Kickaha** · 24th March 2008, 17:50

Originally Posted by FROSTY

Damage done --will it run with just fresh oil added?

If the damge is already done then it wont cost anything but the oil to try, I reckon it'll be ok,the roller bearing bottom ends can handle a lot more abuse than you'd think

If it is fucked I'm interested in buying the engine

**sAsLEX** · 24th March 2008, 17:55

Originally Posted by Kickaha

If the damge is already done then it wont cost anything but the oil to try, I reckon it'll be ok,the roller bearing bottom ends can handle a lot more abuse than you'd think

If it is fucked I'm interested in buying the engine

Remember the Kwak Superbike ran without oil on the rev limiter till the exhaust was glowing red hot........... filled it the next day with oil and it went fine!

**Ixion** · 24th March 2008, 17:59

If it's a roller bearing big end it should be fine. After all, how much oil do two strokes get ?

Piston will only be an issue if it seized. Cam bearings are probably the weakest link, easy enough to check

But, was the oil that dilute when it was actually running, or has more leaked in while it's been sitting ?

Those little engines are tough. I reckon it'll be good to go.

**FROSTY:Me** · 24th March 2008, 18:27

trouble may be that it might have been run a very long time with petroil in the sump

**Ixion** · 24th March 2008, 18:30

I got two strokes that have run for all their lives with petroil in the sump. It'll be fine. So long a sthere's nothing that relies on pressure lubrication.

If there is anything fucked it'll be in the cylinder head, not the bottom end.

I mean, it ain't exactly a Manx Norton to start with , is it.