January 2, 201511 yr My trusty 2002 315R has started to develop a new (and sporadic) issue. When it has been running for a while, it sometimes starts to rev up and down on its own in a rhythmical fashion. Any ideas on where I should start looking for the cause of this? I intend to get the carb off and give it a thorough clean but any other thoughts would be welcome.
January 2, 201511 yr If you are lucky it could be a dirty carb. At the worst the main bearings and seals are going bad. You could pop the flywheel cover off, grab the flywheel and check for play. You could also have an air leak at the intake boot, that can be checked while running. Use contact cleaner or some other spray while idling and spray around the intake.
January 7, 201511 yr Author Chaps, thanks for your comments. I stripped and cleaned the carb at the weekend and the problem wasn't there. I checked the flywheel for play and it was solid as a rock. The local bike shop suspects it might be the crank seals (as lineaway suggested), if so it's gonna be expensive to have them do the work. So, if the seals do need replacing I may have to consider having a crack at it myself. I haven't worked on an engine since rebuilding a Ford Escort about 30 years ago, so could someone who has worked on this Honda engine please let me know how straightforward they are to work on? I have certain tools (ie. decent socket sets, torque wrench, etc.) but I guess there will be others that I need to get. Or is it really best to save up and leave this to someone who's properly tooled up?
January 7, 201511 yr Chaps, thanks for your comments. I stripped and cleaned the carb at the weekend and the problem wasn't there. I checked the flywheel for play and it was solid as a rock. The local bike shop suspects it might be the crank seals (as lineaway suggested), if so it's gonna be expensive to have them do the work. So, if the seals do need replacing I may have to consider having a crack at it myself. I haven't worked on an engine since rebuilding a Ford Escort about 30 years ago, so could someone who has worked on this Honda engine please let me know how straightforward they are to work on? I have certain tools (ie. decent socket sets, torque wrench, etc.) but I guess there will be others that I need to get. Or is it really best to save up and leave this to someone who's properly tooled up? PLEASE before you rebuild the motor check the SPARK PLUG for an "R" Edited January 7, 201511 yr by twinshocked
January 7, 201511 yr Author PLEASE before you rebuild the motor check the SPARK PLUG for an "R" Thanks for your concern twinshocked, it is an 'R' plug, I solved that problem a while ago.
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