DR350 & DRZ400 FAQ - Fuel System
Q:
Glowing header mean running to lean?
I recently purchased a 1992 DR350 and after running it for just a minute or so, or riding it around the block, the header is glowing red. Is that in indication that it is running to lean? If so, is it possible to make it richer without changing the jets? It is also very difficult to start, can this be caused by the lean condition?
A:You really can’t base tuning and jetting decisions on exhaust pipe temperature. Besides the starting issue, does it run well? If it is too lean, there are sure to be some symptoms related to rideability. If it is a jetting issue, you will have to change a jet. Sorry.