Anyone got a favoured method ? I'm turning a pigs ear into a silk purse and have to swap good rockers into another cam cover - but someone's driven the locating pins in. Heat's not doing it. Thinking of TIG welding onto the pin ends and using a slide hammer... Don't really want to have to cut up a usable cover just to get the rockers out. Thanks.
Tab weld some 1/4" rod to the pins and grip in vice. Tap cover away from pin with soft faced hammer. Cut off weld and clean up the pins for reuse.
Yes, well, one pin came out with a screw TIG'd to it. The other broke twice - not the weld, the pin.... So as it was the side that's not under the frame mounting lug - luckily - I marked out the top of the casting and drilled in with a 4.5mm drill. Hit the end of the pin pretty much spot on. Drove it out with a pin punch. The casting is reusable as I'll tap the hole for a 5mm grubscrew. The shafts and O rings were as expected - covered in RTV. Ugly.
The saga is pretty much done. XR head and warm cam onto a CB250RS with a 1mm o's Wiseco. But it turned up some info which may be of use to others. Yes, the XR/XL head interchanges - But.... The dirt bikes are tuned for torque and use different rocker ratios inlet to exhaust in order to get a shorter/lower inlet valve curve off the same profile used on the exhaust.The cam appears to be the same across all models. The CB250RS uses the same ratio rockers both sides - giving a higher lift longer duration on the inlets than the dirt versions. Now which came first is open for discussion. Did the dirt bike prototype need to be made less peaky ? Then when the road one was done someone said - "I know how to pep this thing up a bit " Irrelevant anyway. Just be aware that the 250RS heads are the better ones - and the rockers don't interchange.\ And yes, they all crack...
