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Post by LC'Adam on Apr 18, 2011 0:17:29 GMT 1
......does your 125 get get on the temperature guage? Mine has always sat at just under a 1/4 but recently it has been creeping up. Today I saw it reach nearly 3/4 after putting my original Micron end can back on  There was also an alarming smell of burning from the exhaust, pulled plug out, was tan brown. I think that it might be because the coolant is contaminated with fuel, the slow leak on the head gasket steadily contaminates the coolant. It could also be the pressurisation of the system that is reducing its cooling effect. Basically, it gets very hot, very quickly. So hot you could burn yourself on the silencer and the barrel/head are are about the same temperature. I am sure that the reason I have burned away the silencer packing on 2 separate pipes now is because of this hot running. The exhaust gas temperature seems excessive. It is very hot when you rev the bike and put your hand in the flow of gas. Heat seems to be stored in head/barrel area and the radiator/coolant never seems to get that hot at all. Looks like I'm going to have to have to skim both the head and top of cylinder, fit a genuine head gasket, torque the head down as per manual. Replace water pump impeller, seal and bearing. Clean the radiator, refit the yam rad guard and fill it up with the best coolant possible. That way it will have no excuse to get hot  Other than that pulls much better with longer end can fitted ;D |
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Post by carlos on Apr 18, 2011 19:08:48 GMT 1
If the head gasket is pressurising the system it'll be displacing the water and filling it up with air, meaning it wont be cooling as well as it should!
How hot is the radiator?
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Post by LC'Adam on Apr 18, 2011 19:17:13 GMT 1
Not hot enough mate, you can dip your finger in the coolant even after a full thrash ride. I think this is the main cause. Replaced the head gasket 3 times and tried 2 different heads, 1 was rubbed perfectly flat on an engineers table, still pressurises What did yours run at mate? |
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Post by carlos on Apr 18, 2011 19:22:43 GMT 1
went to just over half in traffic, but soon cooled down again when it got moving!
and when it was hot there would be no way you could dip your finger in the radiator!
Water pump issue?
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Post by twostroker on Apr 18, 2011 19:25:03 GMT 1
ive always been lead to believe longer end can= wider spread of power so more useable.
maybe as the weather is getting warmer your renetic rad guard is becoming a problem.my 125lc always ran hot with one of them fitted , try it with no rad guard and the standard one and see how you get on before you pull the engine to bits
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Post by LC'Adam on Apr 18, 2011 19:27:46 GMT 1
You know it could be, I dread to think how hot the piston must have been to make the sender read over half when the coolant its self is only luke warm.
Clutch cover is coming off tomorrow to replace plates. Will inspect water pump then and might take my head an barrel to an engineer to face them off.
Will try gen gasket too if they are available?
Cheers mate
Adam
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Post by LC'Adam on Apr 18, 2011 19:29:57 GMT 1
Yeah good point twostroker but the rad isn't even getting hot which leads me to belive its eighter the water pump or headgasket. Need to get this sorted once and for all |
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Post by carlos on Apr 18, 2011 19:30:34 GMT 1
the warping head may be the effect, not the cause!
And if the water isn't hot in the radiator with the bike standing still you've got circulation issues!
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Post by LC'Adam on Apr 18, 2011 19:36:36 GMT 1
Yeah your right, could be the excess heat that is popping the gasket over and over. Funny that it hasn't seized or anything yet though and it pulls very well too  Could be an impeller blade come off and jammed in the system somewhere? |
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Post by carlos on Apr 18, 2011 19:56:45 GMT 1
could be a number of things, is the radiator clean inside?
Have you ever had the pump apart before?
Is it Pre mix or injected 2 stroke?
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Post by johnlc on Apr 18, 2011 20:01:04 GMT 1
Mine never went over half way even after being tuned
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Post by LC'Adam on Apr 18, 2011 20:09:47 GMT 1
Never had water pump apart, it runs on premix 32:1 and radiator is probably dirty due to exhaust/fuel contaminating the system due to headgasket.
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Post by carlos on Apr 18, 2011 20:18:42 GMT 1
has it got an oil pump in place?
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Post by LC'Adam on Apr 18, 2011 21:01:23 GMT 1
Yes, its running dry  |
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Post by LC'Adam on Apr 18, 2011 21:12:18 GMT 1
I would be very grateful gaz mate, wouldn't mind a chat about rebuilding my other bike.
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Post by carlos on Apr 18, 2011 21:13:05 GMT 1
Does the 2 stroke oil not lube the pump? Does it not run off the same cogs as the water pump? Could it have seized and broken the plastic water pump drive gear? Gaz? ? |
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Post by LC'Adam on Apr 18, 2011 21:21:27 GMT 1
Thats c**k on mate I'm in all day  Bring that cron down as well if you want mate, wouldn't mind a look. Could be seized oil pump, my bad  Text me when your on your way and I will get the kettle on ;D |
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Post by carlos on Apr 18, 2011 21:27:47 GMT 1
At least once it's fixed, it's fixed!
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Post by LC'Adam on Apr 18, 2011 21:39:00 GMT 1
They are never really finished though are they carlos lol, you could carry on forever massing with them ;D The way this bike is at the moment, its just one thing after another  Money pits  |
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Post by carlos on Apr 18, 2011 21:50:17 GMT 1
you're probably going to have to remove the pump and fit some kind of blanking plate!
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Post by loctite on Apr 18, 2011 21:52:08 GMT 1
same symptoms has my 350lc had water impeller spinning freely on shaft doh thats what my problem was cheers nigel
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Post by LC'Adam on Apr 18, 2011 22:20:21 GMT 1
Yeah, I already bought a blanking plate from norbo, just never got round to swapping it out Looking like the impeller is the problem, will see tomorrow and report back. Either way, if the oil pump is salvageable, I will probably start to use it because premix is a pain. Clutch will get replaced as well. Then its just the head to sort, then the indicators and finally the front brake Bloody LC's |
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Post by carlos on Apr 18, 2011 22:24:52 GMT 1
These things are sent to try us mate!
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Post by LC'Adam on Apr 18, 2011 22:32:58 GMT 1
Very true mate. Life = A series of challenges! Some greater than others admittedly. Thank god for this forum so I can solve my LC ones ;D And make good mates too  |
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Post by carlos on Apr 18, 2011 22:36:04 GMT 1
look forward to the update on your findings tomorrow!
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Post by LC'Adam on Apr 18, 2011 23:01:10 GMT 1
Yep so do I lol, If there is anything interesting, I will take some pics too  |
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Post by LC'Adam on Apr 19, 2011 18:41:35 GMT 1
Ok so, Its not the water pump or the oil pump, both appear to be working as they should. Oil pump pulses in and out and coolant can be seen swirling in the rad when you rev her up. The engine is getting alarmingly noisy and vibey too However as stated before, it pulls very well, performance does not seem to fade as the temp rises. It seems I was mistaken, as today, rad did seem to be getting HOT as were coolant pipes. The end can is definitely getting too hot even when the temp guage is still on 1/4. The only other thing I can think of is that the long end can is some how causing it to overheat? Perhaps it is clogged with carbon or something an acting like a little oven? Its either that or mankey coolant or pressurising system or a combination of all 3 that is causing it Some pics any way to add some colour to this thread Out in the sun.   Adam |
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Post by mellow on Apr 19, 2011 18:46:27 GMT 1
death rattle m8 |
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Post by johnlc on Apr 19, 2011 19:32:26 GMT 1
If it's getting vibey ,there's a fair chance that the mains are on their way out along with the lhs crank seal ,take the ignition cober off and shake the end of the rotor ,any play will be obvious
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Post by carlos on Apr 19, 2011 20:27:45 GMT 1
what about cleaning the exhaust out???
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