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Posted

got an nsr 125 and noticed it runs quite cold, most of the engines do, just wondering as heat is the main problem for 2 stroke do you recon i could fit a slightly bigger carb and rejet to get a bit more power


Cheers

Chris

Posted

Hi, If it running cold could be a couple of issues.

My first check would be, If its water cooled to check the thermostat and cooling system is working correctly.

Secondly if you know anything about checking a 2 stroke engine, take it out run it up get it hot and then do a plug chop. Check the condition of the spark plug, crispy brown colour is what your looking for. White or black then you have got issues. In general you will not be able or need to fit a bigger carb, though you might need it rejetting to get the best out of it, also check the air filter this is a must.

Note: Don't mess with it if your no sure, 2 strokes are not forgiving, if you get the fueling wrong, you could end up with an hot or even cold seizure. expensive

Posted

If your trying to make it go quicker, then one of the best and cheapest ways with a two stroke is to de-carb the exhaust. Some have a metal baffle type thing that pull out of the exhaust and then you can just blow torch it clean. Others have none removable baffles, which you then need a special liquid to clean them inside. If you use the liquid, make sure you follow the instructions, its nasty stuff and also gets extremely hot!

Posted
If your trying to make it go quicker, then one of the best and cheapest ways with a two stroke is to de-carb the exhaust. Some have a metal baffle type thing that pull out of the exhaust and then you can just blow torch it clean. Others have none removable baffles, which you then need a special liquid to clean them inside. If you use the liquid, make sure you follow the instructions, its nasty stuff and also gets extremely hot!

caustic soda if my memory serves me right, just bung up one end and pour in .. roll them about a bit with gloves on, the word caustic gives a clue..

Posted

caustic soda if my memory serves me right, just bung up one end and pour in .. roll them about a bit with gloves on, the word caustic gives a clue..

 

Thats the stuff

Posted

Cheers


Plugs are fine and a nice golden brown, all the thermo and rad are good and i got right amount of coolant in according to the nsr forumn they hardly run hot unless theres a problem, i'll give the exhaust a good clean this weekend.


Chris

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