Welcome, Guest. Please Login or Register

Author Topic: 640 Engine rebuild  (Read 874 times)

0 Members and 1 Guest are viewing this topic.

Offline EtienneKLR

  • Senior Member
  • ***
  • Bike: KTM 990 Adventure
    Location: Eastern Cape
  • Posts: 599
640 Engine rebuild
« on: July 03, 2014, 10:25:31 am »
Chaps three things that I have found on my KTM 640 adv engine that might be worthwhile checking out. Confirmed through some research that these are in fact weak points.

1. Balancer shaft bearings are small and the spinning eccentric weight puts a big load on these. Both mine were worn and the casings damaged due to the balancer rubbing against the casing. Small job, cheap and easy to replace these. You will need some basic hand tools and an internal bearing extractor.

2. Cam shaft followers. Check and inspect these for wear. Also a simple job however bearings are expensive. Better to replace these during periodic maintenance rather than a camshaft when these do pack in

3. Water pump bearing and seal. Also not difficult and a good preventative measure.

All these were worn on my engine. Thank goodness that I opted for the engine rebuild.
 

Offline JMG

  • Senior Member
  • ***
  • Bike: Honda XR650L
    Location: Gauteng
  • Posts: 2,015
  • Thanked: 11 times
  • Miss my orange bike!
Re: 640 Engine rebuild
« Reply #1 on: July 03, 2014, 01:24:14 pm »
Warning heeded, thank you, mine is due for some love.
Honda XR 650L, Royal Enfield 500 classic, TVS APACHE 180, Ktm 640 adventure R, Yamaha XT250.
 

Offline wobble07

  • Member
  • **
  • Bike: KTM 1190 Adventure
    Location: Gauteng
  • Posts: 331
  • Thanked: 9 times
  • By grace alone........
Re: 640 Engine rebuild
« Reply #2 on: July 04, 2014, 08:06:52 am »
Hey guys.
My 640 has this "clunck" sound when I switch it off. Normal.
Fanks
990 Adv. Sold
640 Adv.Sold
1190R Sold
701enduro
300 xc-W
 

Offline JMG

  • Senior Member
  • ***
  • Bike: Honda XR650L
    Location: Gauteng
  • Posts: 2,015
  • Thanked: 11 times
  • Miss my orange bike!
Re: 640 Engine rebuild
« Reply #3 on: July 04, 2014, 08:15:24 am »
Yes it is normal, disconcerting but normal
Honda XR 650L, Royal Enfield 500 classic, TVS APACHE 180, Ktm 640 adventure R, Yamaha XT250.
 

Offline evansv

Re: 640 Engine rebuild
« Reply #4 on: July 04, 2014, 08:16:32 am »
 :sip:
DT 125, GSX 750 ES, XJ 900, KX 125, YZ 250, WR 200, RMX 250 (280 kit), FZ-6, 2006, DT 125 LC (rear ended by Fortuner - written off), DT200R (current), KTM 625 SXC (current)
 

Offline EtienneKLR

  • Senior Member
  • ***
  • Bike: KTM 990 Adventure
    Location: Eastern Cape
  • Posts: 599
Re: 640 Engine rebuild
« Reply #5 on: July 04, 2014, 10:16:54 am »
Hey guys.
My 640 has this "clunck" sound when I switch it off. Normal.
Fanks

Starter clutch. very normal. No worries there.
« Last Edit: July 04, 2014, 10:17:15 am by EtienneKLR »
 

Offline Edgar

  • The ultimate
  • Senior Member
  • ***
  • Bike: BMW F650GS / Dakar
    Location: Gauteng
  • Posts: 2,907
  • Thanked: 169 times
Re: 640 Engine rebuild
« Reply #6 on: August 18, 2014, 01:13:40 pm »
Is is possible to judge by the enigine sound alone what maintenance needs to be performed on the engine? My LC4 sounds like a "loose chain" in the engine. Not at idle, but you can distictly hear it on deceleration ect. Could it be the timing chain? How would I know if the main bearing is on it's way out? approx 34 000km on the clock.
 

Offline JMG

  • Senior Member
  • ***
  • Bike: Honda XR650L
    Location: Gauteng
  • Posts: 2,015
  • Thanked: 11 times
  • Miss my orange bike!
Re: 640 Engine rebuild
« Reply #7 on: August 18, 2014, 05:14:54 pm »
Mine makes the same noise!
Honda XR 650L, Royal Enfield 500 classic, TVS APACHE 180, Ktm 640 adventure R, Yamaha XT250.
 

Offline EtienneKLR

  • Senior Member
  • ***
  • Bike: KTM 990 Adventure
    Location: Eastern Cape
  • Posts: 599
Re: 640 Engine rebuild
« Reply #8 on: August 27, 2014, 10:11:02 am »
Sounds like a worn timing chain. The tensioner can only take up so much slack. Especially under deceleration