South West Bikers | Motorcycle Forum

jam wrote:Inlet cam followers siezed and holding the inlet valves slightly open, hence the drop in compression. With the valves closed the compression is good again, so the next stage is to have the rocker arm and shaft spark eroded to get them out of the cam cover assembly, and replace them with new items, if all goes well it's a simple job, if however the spark eroding is not able to do it then it involves a new head as the cam cover is line bored with the head for the camshaft bearings. I'll keep you updated as the thing is being collected on Wednesday evening to be sparked.

keeeeerrrrrr.............ching

Post No. 2 in this thread .... "However, if you really have no compression, then it's likely to be either valves or piston .... "



Ah, "Smug - Mode"

Let's hope the foloers come out OK, I guess a new head is likely to get a bit pricey - did you get a warranty when you bought it

I think he got 1 month warranty from speed but thats already gone

Cost of the easier option comes in at around £350 to £400 inc labour, that however will more than double if a new head is required as a new head comes in at £475, and would require the valves swapping over from the old head, as well as a new follower and shaft. The old rocker arm is siezed onto the shaft and cannot be pressed out as there is nothing at the other end to get access, hence needing the thing spark eroding off. I looked to see whether I could get in there to cut the thing out with a slitting disc, but the access is too tight and risk of further damage too great, so sparking is the only option left.

Oh dear, commiserations Wanzey, that is a fat bill even on the 'if all goes well' side of things. Sorry mate, still you've got two kidneys right? You only need the one alledgedly !

Mmmmm steak and kidney pudding, yum yum.

Jam could you not drill a hole in the oppsoite side and punch out the shaft, then thread that hole and screw in a short bolt with copper washer to bung the hole?

badgerKDD wrote:Oh dear, commiserations Wanzey, that is a fat bill even on the 'if all goes well' side of things. Sorry mate, still you've got two kidneys right? You only need the one alledgedly !

Correct I have only had one for several years now

Banditmax wrote:Jam could you not drill a hole in the oppsoite side and punch out the shaft, then thread that hole and screw in a short bolt with copper washer to bung the hole?

Unfortunately not, the design of the rocker box means that although the other end of the shaft is visible into the cam tunnel, there is no way of getting something substantial enough to press it out in there. so tomorrow it will be collected by a chap who does all my engineering jobs who will spark erode it into a couple of pieces which will then allow removal of the remainder. He will also be getting the exhaust shaft and new inlet shaft to machine a shallow spiral along the length which will aid oil retention within the assembly, as I reckon there is a design flaw with the rocker arms and shafts as the only lubrication is via two 6mm holes on top of the rocker arm which is splash fed, and does not provide adequate oiling to the pivot shaft.

ahh right, bit of a bugger then really. I'll know to avoid ktm 625s then.

Banditmax wrote:ahh right, bit of a bugger then really. I'll know to avoid ktm 625s then.

If only Sam had ..he'll snap soon

TOM91 wrote:

Banditmax wrote:ahh right, bit of a bugger then really. I'll know to avoid ktm 625s then.

If only Sam had ..he'll snap soon

It's a feckin' good job his is a 640 LC4 motor then really

jam wrote:

TOM91 wrote:

Banditmax wrote:ahh right, bit of a bugger then really. I'll know to avoid ktm 625s then.

If only Sam had ..he'll snap soon

It's a feckin' good job his is a 640 LC4 motor then really

Still 625cc though isnt it.

Just avoid KTM bloody expensive i have a nice Z 650 for ya or a TDR

wow i havent been on for a while! once again thanks jam! yes moose smug mode on ;) and yea pricey shit but its got to be done to be honest :/ not sure if any poor sod would want my kidneys tbh theyre better off gone if you ask me! and nah tom, i, mahppy with her shes a beast ill just have to keep an eye on coolant levels a bit more closely from now on