Help me save my A100!!!

[geoffm]

All else fails, I have an A100 motor in the shed. Was a runner, and stored for years (with oil down the bore). Condition unknown otherwise.
Geoff

[Str8 Jacket]

All else fails, I have an A100 motor in the shed. Was a runner, and stored for years (with oil down the bore). Condition unknown otherwise.
Geoff

Oh, oh, oh. Im your new best friend!! Should I need to be....

[speights_bud]

Hmmm after all these talks of things and stuff, i just remember when i got water in my GPX fuel, it wouldnt go over 70, have you trid another tank of gas? draining the previous of course. Also, on my one i removed the choke altogehter because it wouldnt run at all otherwise (I.e an extra cable i couldnt be arsed with having around) [I also ran mine no battery, tore ALL the wiring out of it and linked the coil direct :P the bike only had one single wire on it ]

[quallman1234]

Any Luck yet? Or is it pit bike engine transplant time?

[Str8 Jacket]

Any Luck yet? Or is it pit bike engine transplant time?

Gonna rip the fly wheel cover of today and replace the points, the whole condensor actually... Fingers crossed!

[koba]

All else fails, I have an A100 motor in the shed. Was a runner, and stored for years (with oil down the bore). Condition unknown otherwise.
Geoff

She might be needing that if its for sale aye!
Took it apart after trying substitution of ancillary bits and: woah hello! Piston and bore have been rubbing together like teenagers!
The timing was out by a wee bit after we got another a to compare it to but no other ideas so far on what may have caused that to happen.
Could the timing being 5 or so degrees out have got it hot enuf to do that much damage? Hoping thats it coz really dont wan't to fix it to have it go again.
I'm quite amazed the wee thing starts!

What fat rings the wee thing has too, so cute such a wee engine!

[Str8 Jacket]

What fat rings the wee thing has too, so cute such a wee engine!

Why dont you marry the bloody thing then!

[merv]

The A I had in the 70's had a bulletproof engine and what you have described with the piston and bore sounds atypical so I'm wondering have you had oil pump problems because I presume this one is still Posilube oiling and not premix in the tank?

[Paul in NZ]

Either that or it's just plain wear n tear... No engine lasts forever...

[merv]

Either that or it's just plain wear n tear... No engine lasts forever...

Str8, Paul's point would mean that the piston and bore would be well worn so did this thing have great piston slap and what is the ring gap like in the bore? Those engines were good for at least about 30 - 40,000km on a piston.

I thought from Koba's comment about teenagers he was meaning it looked like it suffered some serious abrasion not just normal wear hence my question about the oil pump.

[Str8 Jacket]

Righto, I have ordered and paid for a brand new complete piston kit from Tony B at a very reasonable price! Once I get the piston I will take that and the cylinder to the engineer type people just around the corner from my work and get the cylinder bored to fit the new piston. Fingers crossed that this does the trick cause its all relatively simple (at the moment)! I really cant see it being anything else!

Though now I have actually stripped and put back together an A100 and I pretty much know how they work and gained some very valuable mechanical knowledge and learnt alot myself and lack of patience, lol!

Thanks koba for all your patience, especially cause I blew up your bike and that's still not anywhere near being fixed!

[DingoZ]

So not long now to being able to ride (the bike) again...

[Str8 Jacket]

So not long now to being able to ride (the bike) again...

Well, hopefully. It is intended for bucket racing and as its starting soon im hoping it'll be ready!

[koba]

Str8, Paul's point would mean that the piston and bore would be well worn so did this thing have great piston slap and what is the ring gap like in the bore? Those engines were good for at least about 30 - 40,000km on a piston.

I thought from Koba's comment about teenagers he was meaning it looked like it suffered some serious abrasion not just normal wear hence my question about the oil pump.

Yea, it will definatley be getting a very close checkover before the new piston goes in, It did nip up rather than just wear out with some very distinct marks.
It has been thru a heluva lot in its lifetime remember.
According to those who know more about such things than I it looks like it was from getting too hot.
Maybe the timing being out a bit could have done that?
Or also maybe merceiless thrashing?
It was still burning plenty of oil as it slowly died.


As I said, a VERY close checkover

[quallman1234]

How badly scored was the ol' barrel? - remember when i said you should just whip the head off for a quick lookie? Hehe

What OS you going with? I just fucked my AX100 Pistion gotta buy me another one from tony B