why is my rs 125 running hot?!!!!

[veze]

ive got an rs 125 extrema, the rotax 123. well i have just had it rebuilt, piston, barell, con rod, main bairing, crank case seals, a new gear, the list goes on, u get the picture. ive had the bike for a couple of days and it runs hot, on the temp gauge it sits at 100 degrees and sumtimes creeps into the red and this is after riding it for a few minutes!. as soon as i turn the ignition on the gauge is telling me its 40 degrees, ive checked the rad, its not blocked, ive checked the water pump, thats working. whats up with that? the ride is rough as arse up 2 8000 rpm and im leaking gear box oil. its leaking from the seal on the left hand crank case where the gear selector shaft goes in, is that seal easy to replace?

[moonym20]

Firstly, you say it has just had a major rebuild,

was this done by a mechanic or by yourself.

If it was done by a mech it is their problem and not yours, get the bike back to them sharpish and have them sort it out.

If you did the work yourself then obviously its down to you.

you say you have checked coolant levels and ensured the pump is working?

I would advise you check your spark plug, your symptoms may suggest its running way too lean which will cause the excess heat. If you whip the plug out and have a look at the colour in the center, it wants to be a coffee brown colour, if its black and fouled (which is unlikely) its too rich, if its a white/light grey in colour then your running far too lean. This will explain the hot running issue.

If your plug is normal then check the actual coolant temp probe to see that its not telling lies. another posibility is that a passage within the cylinder head is blocked restricting the water flow causing excessive heat build up.

Hope that helps

As for the seal i *think* you need to whip teh crank case cover off and check the condition of the seal, it is possible you have overfilled the gearbox oil which may have lead to the leak
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[hmmmnz]

first get a new thermo sensor it sounds like its telling lies.
also get a new thermostat and replace that, as it could be that its not working and not letting the water through to your system.
i would say take the thermostat out and lt the water run freely through, but lots of people think that the pressure that the thermostat gives is essential. up to you ;d

the oil lever oil seal is easy to replace.
just lean the bike over get a self tapping wood screw, screw into the seal, pull it out and then push in the new one.
obviously you have to have the gear lever off
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[veze]

the thermostat has been taken out by the chap at the garage, to be honest i dont think he could be botherd with the bike in the first place, i think he just wanted it running so he could get rid of it. I came off it last nite and smashed one of my indicators off. it was my own sill fault, i pulled the front brake goin into a corner, lesson learned. i had a spare one so i put that on but now the indicators dont flash. they just stay on. should i check through the connections? the ones that join together inside the fairing are ok.

[Kickstart]

Hi

Put the stat back in.

However my first guess would be a dodgy connection on the temperature sensor (as it reads 40 when you turn the ignition on).

Another thing to watch is using too much antifreeze compared to water. If you do that the pump cannot push it round so the engine gets very hot while the radiator just warms up marginally.

All the best

Keith
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