Jump to content

315R Revs 'hunting'


lamptramp
 Share

Recommended Posts

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.

Link to comment
Share on other sites

 

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.

Link to comment
Share on other sites

 
 
 

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?

Link to comment
Share on other sites

 

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 by twinshocked
Link to comment
Share on other sites

 
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...