8Mth old 06 650 4000kms Failure

Thats bad news faktor
Lucky he's still got 4 mths warranty left.
Doesnt sound typical of the failures (mains, torque limiters) seen on some of the 05 bikes-
Hope its a quick easy fix for him- nothing worse than your pride and joy being out of action.

I would get the valve inspection covers off and check for a broken valve spring or cam chain and the spark plug out to make sure the piston is still moving up and down and take it from there.

What ever you do, don't force it to turn over if it doesn't want to!

Let us know what you find out!

Regards,

Joe

faktor

I had a similar sounding problem on a XR250 i owned. I pulled the engine apart and could not find a problem, put it back together and everything was ok.
I don`t know how the auto valve decompresser works on the berg but that was the problem on the X. It was sticking and in the end I disabled it.
If you are losing compression it`s worth looking at if everything else looks ok.

Bill

you've totally lost compression. doubt it started as the camchain as the valves would have stopped closed and the bike would have full compression. you have a leak in the cylinder so it has tyo be
a hole in the piston
a valve is not seated or is broken.

next step is plug out and look for warning signs. as joe says, then remove the inspection covers and look for the engine to turn over the tappets - which it won't i don't think.

regards

Taffy

wonder if the primary nut on the crank had come loose at some time and the woodruff key has sheared off??

As was posted, check to see if the piston is going up and down. If the key is broken, the valve train will still be functioning as it is driven off of the clutch gear.

There have been some valve spring failures on 650's before. That's my guess.
I just have not heard of any spring failures on the 06's.

faktor

where you been lately then mate? but then now isn't a good time to ctach up - right! :crying:

regards

Taffy

faktor said:

Gday Taffy long time no see.

Hi guys yes he broke a valve spring.
Dealer seems to think it was because of the gearing he was running does this seem right?

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Good to hear its a simple fix
Is the dealer trying to say its geared too low for the conditions (sunset country ?) and it runs at too higher rpm for too long ?

he could have a point. if you have it on anything like 14/48 or higher like 13/48 and 14/50 it will rev through very quickly. but listen, it's in your schedule that valve springs are a periodic maintenance part. they certainly needed them changing during the old 53' and '55' cam days.

i would carry on as normal, same gearing, and just change all 4 springs.

oh and faktor: when you leave the chat room tonight, turn the bloody light off will ya!!!!

regards

Taffy

regards

Taffy

faktor said:

He is running 15/48 on open going when i run 16/45.

Anything wrong with the above?

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Hi Faktor,
I've tried the above gearings in similar terrain to yours and theses are my opinions:

15/48 (3.2 :1): Too low for a 650. Doesnt really give you a chance to exploit the big bikes grunt, means you are using a lot of RPM and shifting a lot needlessly. However, it is good in the fact the bike will always normally easily pull up to its top end regardless of whether its a hardpack clay flat or a sandy fire trail.

16/45 (2.81 :1) Too tall. Good in the first 5 gears, but the bike falls flat on its face and struggles to pull the 6th upshift and gain speed, especially if you are in the sand.However,it is good if you just use 6th as a hardpack cruiser gear to lower rpm if you are just touring around and not racing with your friends

15/45 (3.00 :1) a good compromise between the above. This is the gearing I like in the sand country, as it helps cover up the FEs 5th to 6th wide ratio gap that sandy conditions magnify, and makes things a bit calmer than the revvy but mainly effective 15/48.

As I said, just my opinion of gearing for our terrain.

(PS I had 14/45 (3.21:1) on it when I killed the crankshaft in my bike. The dealer (Des?) maybe has a valid point that it is geared a tad low for general Sunset country riding.

My ultimate gearing would be 16/45, but with the .84CR 6th gear fitted instead of the .74WR 6th. That would be sweet. 8)