A friend rang me tonight and said his big red is spluttery and dies down and he said there is oil in the airbox. I'am going to go look at it for him. Any ideas whats wrong. All I can think to do is clean air filter carb, new plug and check oil level and maybe a new oil filter. Any help is appreciated. Thanks.

 

my timberwolf is doing that too...there was too much oil in my engine come to find out...no more oil in there and runs fine...it used to die if i had it full throttle and when i shifted to third gear it wouldnt go faster then 15mph

 

Yep, overfilling the sump will do that, so will blow by, you could try checking the compression.

 

check your air filter...maybe needs new one and your sucking gear oil??

 

3 things can cause engine oil to enter the airbox. Too much oil was put into the motor, depending on where the case breather is located, standing it on end or as silly as it sounds the carb can leak gas into the cylinder. The gas slips passed the rings and into the crank case. The more gas that flows into the case the higher the oil level becomes. This occures with the bike off of course. When you check the oil see if it smells like gas.