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  #1  
Old 4 Weeks Ago
kusaj kusaj is offline
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Default Piston melted

Hi guys,

so I have finally got my 1970 Iron XLH 900 running. I have followed instruction from manual and from a bloke who knows what he is doing, but problems occurred.

After about 80km, bike stopped. I have took it apart and found that front piston has partially melted and seized my valves. Obviously running too lean, way too much advanced.

I am running an auto advance distributor/points accel from J@P.

My question is, would you recommend an electronic ignition system to insert into my distributor and if yes which one?

I don't have the points in the side cover but stuck into the right cover from the top, under the carb.

I am in process of rebuilding the top, new pistons, rings, re-lapping the valves, new valves etc. ....

Thanks heaps in advance! some photos:
https://scontent.fakl2-1.fna.fbcdn.n...a7&oe=61702E3C

https://scontent.fakl2-1.fna.fbcdn.n...5c&oe=6170F156
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  #2  
Old 4 Weeks Ago
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doodah man doodah man is offline
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I feel like there are not a lot of options for timer ignitions, but this is one of them…
http://www.ebeyond2000.net/index.html
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  #3  
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kusaj kusaj is offline
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Quote:
Originally Posted by doodah man View Post
I feel like there are not a lot of options for timer ignitions, but this is one of them…
http://www.ebeyond2000.net/index.html
Thaaaanks, I am having a read about it!
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  #4  
Old 4 Weeks Ago
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That ignition will melt pistons just as fast as points , good choice.
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  #5  
Old 4 Weeks Ago
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My 2 cents. As you said you don't melt a piston because of points, you melt a piston from being too lean or to far advanced timing. I have a 1967 XLH with a EBeyond2000 electric ignition. I am very impressed with it, it is far better than points. However, it goes in on the same screws as your points. If your timing is not set right with points, it will not be set right with the EBeyond2000. So go thru your advance unit making sure the springs and bushings are all good and set your timing with the total advance. Then if you do decide to go with the EBeyond2000 it is pretty much maintenance free after that because there is nothing to wear like points.
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Saying points cause engine damage is like saying forks make people fat.
Points merely produce spark. A properly tuned engine with points ignition will run fine with no trouble at all. They were standard for nearly 70 years.
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It's been my experience that Ironheads like advance but they don't starve well. Running too lean is a death sentence. You may run around town forever without a problem but run 90 down the freeway for a mile or two and in the shop you go.
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Caveat,My eyesight isn't all that good.

But to my eyes it looks like more damage occurring over the intake valve rather than the exhaust ?
This looks different to the kind of damage I've seen from too much advance.
If it were a too lean condition there will be damage in both cylinders and the rear would generally be worse.

Chamber shows signs of running a little rich before the damage.

What work was done prior to this ? Refreshed top end ?
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Quote:
Originally Posted by Ferrous Head View Post
Caveat,My eyesight isn't all that good.

But to my eyes it looks like more damage occurring over the intake valve rather than the exhaust ?
This looks different to the kind of damage I've seen from too much advance.
If it were a too lean condition there will be damage in both cylinders and the rear would generally be worse.

Chamber shows signs of running a little rich before the damage.

What work was done prior to this ? Refreshed top end ?
Hi, I have been working on the engine from scratch, total rebuild, engine splint in half etc. and worked my way up. I have run the bike about 50km around town and was fine. then I took it up on the road doing about 100km /hour and she stopped with seized valves and melted front piston.

You are correct only front piston is damaged like this. Rear is totally fine.
And yes almost 80% of the alloy from the front piston is collected around exhaust (smaller valve)

What do you think?
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kusaj kusaj is offline
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but yes the piston is damaged on the intake side.
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