Thanks gents, I will take off the inspection plate and check it out. If it isn't bad I'll try adjusting.
Forty9 thanks for the link lots of good stuff there.
Thanks Wrench I just put in fresh gear oil about 200 miles ago, feels a lot smoother now.
For anyone else reading:
Had to order from a manufacturer but luckily I found some GL4.
I found out that the SM420 has brass components and the salt in GL5 eats away at the brass. Don't believe the counter guy, GL5 is not better.
