Welcome, Guest. Please Login or Register

Author Topic: 640 LC4 valve clearance  (Read 280 times)

0 Members and 1 Guest are viewing this topic.

Offline Dolf

  • Senior Member
  • ***
  • Bike: KTM 640 Adventure
    Location: Gauteng
  • Posts: 1,570
  • Thanked: 6 times
  • .
640 LC4 valve clearance
« on: April 18, 2019, 05:15:17 pm »
Busy setting the valve clearance but I cannot see TDC due to this window being a mess. How else can I check? If I take this cover off will all the oil piss out?

On the LC4 does the clearance get smaller or bigger over time? When I set it to what I think is TDC you cannot even get a .15mm gauge in there.
« Last Edit: April 18, 2019, 05:16:01 pm by Dolf »
 

Offline Dolf

  • Senior Member
  • ***
  • Bike: KTM 640 Adventure
    Location: Gauteng
  • Posts: 1,570
  • Thanked: 6 times
  • .
Re: 640 LC4 valve clearance
« Reply #1 on: April 18, 2019, 05:51:59 pm »
Think I may have figured it out without looking at the TDC mark....tell me if I'm wrong.

By turning the rear wheel in gear:
1) inlet valves open
2) inlet valves start closing
3) exhaust valves open
4) exhaust valves close and there is a loud click (is my automatic compression release not working properly????Is this click normal?)
5) all valves are now closed
6) inlet valves start opening

At nr 5 we are at TDC? At this point though I cannot get a .15mm gauge into any of the valves though.

« Last Edit: April 19, 2019, 05:51:49 am by Dolf »
 

Offline Colin Kaapschehoop

  • Member
  • **
  • Bike: KTM 690 Enduro
    Location: Mpumalanga
  • Posts: 418
  • Thanked: 22 times
  • Life is a journey, death is the destination
Re: 640 LC4 valve clearance
« Reply #2 on: April 18, 2019, 07:32:03 pm »
As a rule of thumb, If you get the inlet & exhaust valves “rocking” and turn the crank another full turn you should be in the right position to check the clearances. The portion of the cam where the valves are closed is quite large so it’s not critical to be at an exact position.
 

Offline Dolf

  • Senior Member
  • ***
  • Bike: KTM 640 Adventure
    Location: Gauteng
  • Posts: 1,570
  • Thanked: 6 times
  • .
Re: 640 LC4 valve clearance
« Reply #3 on: April 20, 2019, 04:00:52 pm »
Ok, managed to find TDC and adjusted the valve clearance to the upper end of what the manual says - 0.15mm.

At first I could not even get a 0.05mm gauge in there so they were tight.

Not sure if it is my imagination but now the engine sounds much noisier than what it was before.. :o..and it seems these LC4 engines are quite noisy.
 

Offline Dolf

  • Senior Member
  • ***
  • Bike: KTM 640 Adventure
    Location: Gauteng
  • Posts: 1,570
  • Thanked: 6 times
  • .
Re: 640 LC4 valve clearance
« Reply #4 on: April 20, 2019, 04:44:01 pm »
This noise is bugging me. It has been there from the beginning. Who can help with listening to an audio clip and tell me if it is normal for a LC4?
 

Offline Dolf

  • Senior Member
  • ***
  • Bike: KTM 640 Adventure
    Location: Gauteng
  • Posts: 1,570
  • Thanked: 6 times
  • .
Re: 640 LC4 valve clearance
« Reply #5 on: May 18, 2019, 03:19:43 pm »
Ok, managed to figure it out and fix.

I had adjusted the valves at the wrong TDC. They are now adjusted at TDCC and the engine is quiet  :biggrin:
 

Offline superfoxi

  • Forum Vendor
  • Senior Member
  • ***
  • Bike: Honda XRV 750 Africa Twin
    Location: Western Cape
  • Posts: 2,838
  • Thanked: 38 times
  • Professional motorcycle and suspension services
Re: 640 LC4 valve clearance
« Reply #6 on: May 18, 2019, 05:54:59 pm »
A quiet LC4 engine? Are you sure the thing is running?
 

Offline Dolf

  • Senior Member
  • ***
  • Bike: KTM 640 Adventure
    Location: Gauteng
  • Posts: 1,570
  • Thanked: 6 times
  • .
Re: 640 LC4 valve clearance
« Reply #7 on: May 19, 2019, 06:37:10 am »
A quiet LC4 engine? Are you sure the thing is running?

Relatively quiet ok :biggrin:

But compared to some other 640's I've heard this one is actually pretty quiet.