Aluminium CNC log.

[blackburn mark]

it's going ok, My mother bought me a new 125 on monday. It's an RG125 1994, by tuesday, it's broken.

so I have to split the engine, new gaskets and seals etc.

owch! i bet you were ringing its neck in first gear... buy some extra seals and rings... it'll need doing again by wednesday :rofl:

[jcb121]

owch! i bet you were ringing its neck in first gear... buy some extra seals and rings... it'll need doing again by wednesday :rofl:

I had to but i didn't in first! there was no power in the bike at all! if anything they were riding it with popped seals.

I also discovered that the piston hit one of the powervalves! so they are screwed and they cost £130 each!

[blackburn mark]

[QUOTE=jcb121;23237]I had to but i didn't in first! there was no power in the bike at all! if anything they were riding it with popped seals.
QUOTE]
allways a risk when buying a second hand two stoke... especialy an RG:naughty:

£130!!! times have changed :confused: highly strung two strokes are murder for self distructing in first and second... i managed to melt an RD400 three times in the space of 500 miles(way back in the day when pistons and rings where cheap and power valves hadnt been invented)
if you let the motor reach its rev limit in first and second (ish) because of the low speed ergo low wind resistance and drag, the whole drive train goes slack and im pretty sure any lash in the motor causes enough vibration for the piston skirts start slapping against the liners, a bit chips off the skirt causing an imbalance causing more slapping and it quickly cascades into a disaster

over reving is much less important at 30mph (ish) and above as the wind resistance keeps the drive train nice and taught

[jcb121]

grr it has to be done this week!

i need to ride to my MOD 1 on monday.

[blackburn mark]

grr it has to be done this week!

i need to ride to my MOD 1 on monday.

i just did a bit of research on the powervalve (i never got my hands dirty on one) if the bike was a bit guttless after 9000rpm (start of the powerband) then the chances are the powervalve wasnt working in the first place... some versions aparently wear out and can drop parts into your cylinder, possibly what happend to yours ?

if you have all the other replacement parts it may well run well enough for your mod 1 without the powervalve running (i think you can assume it wasnt running anyway)
good luck man :sad:

[jcb121]

Mate, you are almost spot on!

It was gutless all the time! I barely had the power to move me from stopped, I would have to clutch in and rev it again 2-3 times.

The power valve was working, I saw the servo moving about.

when I took apart the engine, the piston was worn to a smooth edge on one section. The power valve has fallen into the engine and it closed off half of the exhaust completely, as well as that the bottom end is leaking pressure.

this would explain how crap it was riding!

The powervalve hasn't completely fallen out of place though, i can still move it physically up and down with out issue. the power valve is in 3 sections and I think just the middle one has fallen down. this would also explain the rattle I heard when riding and the worn piston.

TheTuningWorks have a set of two blades for £250 that i will be buying tomorrow with weekend delivery.

I need to find some good liquid gasket though, the manual states suzuki bond 1215 but I can't find this stuff anywhere and it's a bit late now!

[blackburn mark]

I need to find some good liquid gasket though, the manual states suzuki bond 1215 but I can't find this stuff anywhere and it's a bit late now!

might be worth bending some ears in a local bike shop,,,, not the pocket rocket supermarket type where the staff dont know what oily hands look like and would love to sell you some super duper suzuki bond 1215 for £60
id be looking for some ugly bugger with a beard and oil tattood into his hands... im sure he will have a nice equivelant in a dusty box for a tenner :)