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Old 05-06-2014, 10:17 AM   #1
hscrugby OP
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Joined: Jan 2010
Location: Raleigh, NC
Oddometer: 4,097
2008 ktm 450 xcf timing issues

ok..... so back story...
Lost spark, replaced coil, got a bad coil (new but bad) dug deeper, ending up doing a full tear down clean etc.
Got it bolted back up, started ran a little, then it started backfiring like an automatic rifle in the hands of a drunk marine....

so I think the cam chain skipped...
The hydraulic tensioner dilly seemed to not be engaged maybe? It's a new one, because the old one seemed to be bad...
we didn't exactly do this step:
"24 Compress the cam-chain tensioner until the inner plunger extends 4mm, then screw it back in with the outer cover only. Push the internal plunger with a blunt tool inserted through the inspection hole. You should hear it release. Install the outer nut.

Read more: http://www.dirtrider.com/features/protips/141_0808_ktm_twin_cam_top_end_rebuild/#ixzz30x19Ovzc"

We followed other internet wisdom and serrvice manual which seemed to hint at tapping to get it to work.. NFC...
I haven't torn back in yet to look, but is there some super secret way to ensure these hydraulic tensioners work? Also an easy way to fix/check timing with the cover off?
planning to do something zip tie etc to make sure i'm at TDC... and then make sure the holes are about right on the cam? I really don't want to have to tear down the engine again, but i guess i will...
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Old 05-06-2014, 10:49 AM   #2
dezrat57
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sorry to hear of your prob....
when you figure the cam timing out, buy one of these....i worked for me


http://dirttricks.com/shop/ktm-timing-chain-tensioner

best of luck
dave
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Old 05-06-2014, 10:54 AM   #3
hscrugby OP
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Quote:
Originally Posted by dezrat57 View Post
sorry to hear of your prob....
when you figure the cam timing out, buy one of these....i worked for me


http://dirttricks.com/shop/ktm-timing-chain-tensioner

best of luck
dave
Yea, I really wanted one.... only problem not in stock till end of may...
I'm trying to get my busted ass bike to Rick's RDV in 8 days or so...




Nothing like last minute...
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Old 05-06-2014, 12:05 PM   #4
Foot dragger
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Guessing at whats wrong,and maybe not doing the right thing with the cam chain tensioner during assembly,can lead to endless problems.


The odds of 2 bad coils in a row has got to be astronomical.
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Old 05-06-2014, 12:11 PM   #5
hscrugby OP
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Joined: Jan 2010
Location: Raleigh, NC
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Quote:
Originally Posted by Foot dragger View Post
Guessing at whats wrong,and maybe not doing the right thing with the cam chain tensioner during assembly,can lead to endless problems.


The odds of 2 bad coils in a row has got to be astronomical.
I have good coil now...
But the first coil I bought was definitely bad. (rocky Mountain atv was great replacing it but I didn't even think I'd get a bad brand new coil)

Debugging the bad brand new coil is what led to other trouble...
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