I Really Dont Want 2 Split The Case In 2!!!

Cyclelogic83

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Fellow M'bikers of the world, I have a dilema.
Let me run it by you, to get some opinions.
I have 2 ht engines.
Engine No.1 (F80b) is only a few months old, but recently began making fairly loud geartrain noises on the clutch side, & upon investigation I found that the crankshaft has about 1.5-2mm side 2 side play, & there is slight gas\oil mixture on & around the magneto, not a whole lot, but enough to see its there. So from my homework here on MBc, I assume the bearings are shot, & as far as i can tell I need to split the case in 2, to replace the bearings.

Engine No.2 (a $10 unknown origin special) needs a new top end, but the bottom end seems solid, although it looks to be a few millenia old!!

Is it ok to take the top end off engine No.1 & put it on engine No.2???
Should engine No.2 be considered a ticking time bomb because of it apparent age???
Or should I stop being such a cheapskate and rebuild No.1??
I will be ordering a new RSE, either 49cc hp stge 2 or a 66cc hp stge 1 in the coming weeks for my cruiser build, but I would like to keep my old thrasher alive for the occaisional dirt track thrash!!!
Any sugestions/advice would be greatly appreciated as I'm travelling by pedal-power at the mo!!!
Also any recommendations on the RSE 49/66 will be taken on board.
Thanks, Chris.......
 
rebuild?

ha ha ha ha ha ha ha :giggle: get a new one. not like they cost the earth. fleabay...160...hmmmm
 
Is it ok to take the top end off engine No.1 & put it on engine No.2???

if the parts are the same
sounds like a fun project just for the heck of it
but
sounds as if THINGS are worn and torn
kind of like
Rode Hard and Put Away Wet if you know what I mean

if you know what I mean
I perfer a tight machine
don't want one burnt out that burns too much oil
better young and fast
with a very hot coil
 
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Suggestion: Build one good engine from the 2, from scratch.
But as far as bearings and seals go, replace with quality.
Use new gaskets all round. Head gasket and cylinder-to-case gasket might be best to get new from the local aussie distributors cos the thickness sort of gotta be right, if you understand 2-strokes.
You'll gain experience at least and probably work out of your own mods along the way.

If it all fails, yeah, buy a new one, at least you'll know the engine and be able to offer advice on here from your own expriences!

The problem with re-building a old or broken engine is getting it cleaned to start with. Scrubbing old gaskets, washing up afterwards. These are added hidden costs, and time. Versus the cost of a new engine, or a full kit cos the parts break down eventually, so ya use what works and a full new kit is stored as spares.
 
new engine if you can swing the cash..

for under 100 a new motor that's not even a tank of gas for a suv,
also note that the price will probably drop in the winter months.
I noticed that http://stores.ebay.com/BoyGoFast on ebay was temp sold out ,he was the cheepest I know of..
he does sell jugs,pistons ,ect ..
good luck....
 
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