350lc timing

[scooter]

hi all ive read that the timing should be 2mm btdc but does anybody know what that is in degrees and also im i correct in thinking the engine goes anticlock wise looking from the alternator side
cheers scooter

[4l04ever]

I think the standard 4L0 timing is close to 19 degrees as standard.

[tony2stroke]

If you have standard 54mm stroke and use a 110mm con rod, then you need 19.92 degrees rotation to match 2mm, here is a useful little app to help work out piston position.

www.torqsoft.net/piston-position.html

[scooter]

cheers 4lo4ever and tonytwostroke and is the rotation right

[oldelsieboy]

Dec 22, 2019 18:51:40 GMT 1 scooter said:

cheers 4lo4ever and tonytwostroke and is the rotation right

No, it's left.

OEB

[tony2stroke]

Yep, anti clockwise stator (alternator) side

[tony2stroke]

Dec 22, 2019 19:03:43 GMT 1 oldelsieboy said:

Dec 22, 2019 18:51:40 GMT 1 scooter said:

cheers 4lo4ever and tonytwostroke and is the rotation right

No, it's left.

OEB

I think that may confuse the issue OEB

[earthman]

I dunno about an LC but all the other vehicles I've owned/worked on, rotating the engine via a nut/bolt on the end of the crankshaft is always clockwise.

[tony2stroke]

Dec 22, 2019 19:39:09 GMT 1 earthman said:

I dunno about an LC but all the other vehicles I've owned/worked on, rotating the engine via a nut/bolt on the end of the crankshaft is always clockwise.

Its the opposite way to doing up the nut, otherwise the nut would undo with vibrating and rotation forces.

[earthman]

Dec 22, 2019 20:15:12 GMT 1 tony2stroke said:

Dec 22, 2019 19:39:09 GMT 1 earthman said:

I dunno about an LC but all the other vehicles I've owned/worked on, rotating the engine via a nut/bolt on the end of the crankshaft is always clockwise.

Its the opposite way to doing up the nut, otherwise the nut would undo with vibrating and rotation forces.

I take it that the thread on that shaft is a left handed one then? 

When the engine is firing/running, is the crankshaft turning clockwise? I know this is the case on many a four stroke engine, whenever I've done cam belts or valve adjustments for example, manuals have said turn over clockwise.

[tony2stroke]

Let me see if I can explain, there are 3 shafts in the engine, 1 on the crank and that goes anti clockwise, then the clutch shaft that spins opposite direction (clockwise), then output shaft that spins anti clockwise again, the same direction the wheel spins, if the crankshaft span clockwise the bike would run in reverse.

So as OEB said turns left, which is anti clockwise.

This is sitting on the bike looking at left side of bike.

I hope I haven't confused the issue here.

[shaunthe2nd]

Easy to check, just push gently down on the kicker and you will be able to see the rotation.

[earthman]

This is the shaft that we are talking about, usually there's a big nut on the end of that thread which manuals say to turn clockwise to align timing/cam lobes, so those engines certainly fire/run in a clockwise direction. I know that some engines are designed to run in an anti clockwise direction, didn't know that an LC were one of them, is this common with 2 stroke engines then?? 

[tony2stroke]

Dec 22, 2019 22:34:05 GMT 1 earthman said:

is this common with 2 stroke engines then?? 

Yes Mate, As I said crank goes round anti clockwise, which transfers the motion the opposite way on the clutch shaft to clockwise, which in turn transfers the motion back to clockwise on the output shaft, which has the front sprocket, which in turn then turns the rear wheel sprocket in the same anti clockwise direction through the chain.

I think on a 4T the reason for clockwise rotation is to line up timing marks only, there is a lot of force needed to turn a 4T engine compared to a 2T engine, and if you turned the nut clockwise in this situation the cam or crank nut can come undone instead of turning the engine.