=?ISO-8859-1?Q?=A3250_reasonable_for_a_GPZ_500s_engine=3F?=

Harry Bloomfield <harry.m1bytNOSPAM.TakeThisOut@tiscali.co.uk> wrote:

 > All right I'll admit it..... I managed to blow up the engine whilst it
 > was ticking over on the centre stand. I was trying to set up the carbs
 > at the weekend....
 >
 > I have been offered a second hand engine with 22k on the clock
 > including carbs for £250, is that a reasonable sum to pay for one from
 > a breakers?

Yes. Very reasonable indeed, assuming it's not knackered.

Go on, then. How did you blow the old lump up?


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The Older Gentleman formulated the question :
 > Yes. Very reasonable indeed, assuming it's not knackered.
 >
 > Go on, then. How did you blow the old lump up?

I'm not sure....

I was trying to balance the carbs a bit better than they seemed to be,
to sort out the clatter at tickover. I wasn't having much success and I
guess the engine was getting hotter and hotter without me noticing.
When I did notice I cut it off, then it appeared to be seized when I
tried to restart it. I then allowed it to gently cool down, but when I
could manage to turn it, it sounded very gritty inside.

It had seized before. I did a run of about 5 miles, parked up for ten
minutes, tried to start it and it was seized. After allowing it to cool
completely it started and ran fine for several hundred miles.

The clatter only happened at tickover and nothing I did with the carbs
seemed to improve it, so I fancy there was after all some mechanical
problem and I was lucky it died at home rather than miles away. I'll
pull it apart once I have a chance, so can see what went wrong.

--


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Regards,
Harry (M1BYT) (L)
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On Wed, 02 Jun 2004 23:02:23 +0100, Harry Bloomfield
<harry.m1bytNOSPAM DeleteThis @tiscali.co.uk> wrote:

 >The Older Gentleman formulated the question :
  >> Yes. Very reasonable indeed, assuming it's not knackered.
  >>
  >> Go on, then. How did you blow the old lump up?
 >
 >I'm not sure....
 >
 >I was trying to balance the carbs a bit better than they seemed to be,
 >to sort out the clatter at tickover. I wasn't having much success and I
 >guess the engine was getting hotter and hotter without me noticing.
 >When I did notice I cut it off, then it appeared to be seized when I
 >tried to restart it. I then allowed it to gently cool down, but when I
 >could manage to turn it, it sounded very gritty inside.

"Gritty inside"? This...

 >It had seized before. I did a run of about 5 miles, parked up for ten
 >minutes, tried to start it and it was seized. After allowing it to cool
 >completely it started and ran fine for several hundred miles.

....and this ^ makes me think that you don't know much about motors.
Four strokes don't really seize and then go again. You sure it's not
just a dodgy starter clutch?
--
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On Thu, 03 Jun 2004 09:30:12 +0100, Champ <neal RemoveThis @champ.org.uk> wrote:


 >"Gritty inside"? This...
 >
  >>It had seized before. I did a run of about 5 miles, parked up for ten
  >>minutes, tried to start it and it was seized. After allowing it to cool
  >>completely it started and ran fine for several hundred miles.
 >
 >...and this ^ makes me think that you don't know much about motors.
 >Four strokes don't really seize and then go again.

They can do, depending on the cause of the seizure. I seized my SL125
at least twice - both times it restarted once it had cooled down -
when doing a regular Liverpool-Derby weekly commute on it back in
1978.

On both occasions I'd been running it flat out (65 or so) for an hour
or more and later inspection revealed very little engine oil indeed
(just smoke from the filler cap) , so it was clearly due to
overheating and lack of lubrication leading to expansion of some part
of the crankshaft, which when cooled ran freely again with no apparent
damage having occurred.

--
Ace (brucedotrogers a.t rochedotcom)
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Champ explained :
 > "Gritty inside"? This...
 >
  >> It had seized before. I did a run of about 5 miles, parked up for ten
  >> minutes, tried to start it and it was seized. After allowing it to cool
  >> completely it started and ran fine for several hundred miles.
 >
 > ...and this ^ makes me think that you don't know much about motors.
 > Four strokes don't really seize and then go again. You sure it's not
 > just a dodgy starter clutch?

I've not really had the time to spare to investigate, but both times
the starter motor just thumped without turning (new battery installed a
couple of weeks ago). In any gear the back wheel was locked solid and
this time I only managed to free it up enough to turn the engine over a
few degrees. It sounded very 'gritty', turning it those few degrees.
There is no free movement at all, it is 'gritty' as soon as the crank
is turned either way. I suspect from the feel it might be a shattered
piston.

Experience... Well not very much for a long time. I have not had need
to pull an engine apart for a considerable number of years, but I used
to strip and rebuild them long ago. I was more or less brought up in a
garage.

I've just been out to have a look at the replacement engine and
although I could not have a listen to it running, it is guaranteed
against problems and the donor bike looks well cared for and the engine
externally spotless.

--


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Regards,
Harry (M1BYT) (L)
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Ace laid this down on his screen :
 > They can do, depending on the cause of the seizure. I seized my SL125
 > at least twice - both times it restarted once it had cooled down -
 > when doing a regular Liverpool-Derby weekly commute on it back in
 > 1978.

I agree, I have had 4 strokes engines seize and almost seize a number
of times before. Usually due to overheating - lack of water or oil. The
power output declines and if you catch it in time.....

--


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Regards,
Harry (M1BYT) (L)
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