GN250 running lean

[FROSTY:Me]

An interesting side note here--Ive got a DR200 -very similar engine wise to a GN--yet it has an oil cooler -makes me wonder if these engines run hotter than we think

[cowpoos]

An interesting side note here--Ive got a DR200 -very similar engine wise to a GN--yet it has an oil cooler -makes me wonder if these engines run hotter than we think

not really a comparison tony....differnt horse for different courses...

dirt bikes need a lot of cooling relitive to there capacity becase they are genrally slow moving and mud fills up cooling fins on air cooled bikes...a oil cooler is just a extra precaution in alot of cases to ad reliability in places that have a higher ambient temprature...as oil is more resonsable for cooling a engine than the air flowing over the fins...or if water cooled,water flowing through the block... thats why good oil is a god send to a engine!


Back on topic...if theres a tiny bit of shit in the carb....just a tiny tiny bit..it can get sucked into the needle gallery and can block just a tiny tiny bit of gas...and that can be all it needs to run lean!....I dare say theres a adjustment of some sort on a GN carb...talk to a mechanic.

[BASS-TREBLE]

I know the thread is old,
What affect would the removal of the exhaust plate have, leaner or richer?
I've been trying to get my head around it but dont have any reasons for either.

Another thing, what is an equivelent NGK spark plug to the stock one?

cheers