Pinned So what have you done to your bike today?

Maybe they use both, either way the service was crap

 

Okay so another forum has given me a procedure to change the cam chain without splitting the cases - opinions?

Linkin if the sprockets are ok with the help of a 2nd person and a chain breaker/joiner the cam chain can be changed without splitting the engine cases.

Remove spark plugs and cam covers.
Set motor to TDC No1, usually a mark on the flywheel and engine case or via a view window next to the clutch. (Model dependant in my experience.)
Mark TDC No1 setting on both cam shafts.
Remove anti de railer over cams if present (model)
Remove auto tension adjuster
Get a couple of lengths of thin wire and feed through cam chain at 2 points. These 2 points should be one on exhaust side and one on intake side of associated cams and secure to available anchor point not attached to the cams. (fuse wire works well)
Use a chain breaker to split the old cam chain between the cams taking care not to drop the connecting pin as the chain breaks. (placing a magnet under the breaking point is good practice in case the pin drops, don't forget to remove the magnet once the pin is secured)
Fold old cam chain back out of the way.
Unbolt both cam shafts sufficiently to allow all intake and exhaust valves to close.
Attach end of new cam chain to end of old cam chain with a small piece of fuse wire. You are attaching to the opposite side of the chain as the auto tensioner.
With help of 2nd person you remove the anchor wires and hold by hand under tension and have 2nd person slowly turn motor over in operating direction by hand to feed the new chain in and old chain out. (I hope I'm preaching to the choir but never ever use the starter button to do this, when showing someone how to do this I normally make them take the battery out first for this reason.)
When new chain has emerged and is of equal length re set crank to TDC No1.
Check cams are at TDC No1 and bolt back down (wet cams with a little fresh engine oil first).
Confirm Cam timing matches the crank and join new chain with joiner tool.
Re fit cam chain tensioner.
Carefully turn motor over by hand to confirm valve timing is correct.
Torque up cam shaft journals to spec.
Re fit anti de railer if used (may need replacing if worn, some bikes have them built into the cam covers)
Re fit cam covers.
Re fit spark plugs.

This process can of course be incorporated into the valve clearance bucket/shim adjusting process.

This all of course presumes the cam and crank sprockets are still serviceable.

The designers of these little 250's like symmetry, and must not have thought any of these motors would live long enough to need a new cam chain.

If you need to change the guides however, ignore the above and split the cases. It's the only way.

 

I do have a chain breaker from when I did the 520 chain on the Ninja. It should have a suitable pin for the cam chain.

I still don't trust myself doing any of this internal engine work. I'd like to have a dead engine to play with though, just not this one

 

Don't be scared... you can do it!

 

@Linkin It will be fine as long as you don't damage the chain when breaking or rejoining it. Join the old and new with the proper tool, careful not to let it slack and feed it through. There is absolutely no reason why it wouldn't work unless you get impatient and rush it.

 

I just about browned my undies this morning, was moving along slowly in traffic on a side street, had started to slow done, gave it a bit of throttle and what happens? The rear starts spinning, a layer of damp leaves on the road. Span violently left, then right, then left again. Thankfully did not come off the bike or drop it

It happened so fast I didn't have time to think... But I remember holding everything where it was. Keeping the front wheel straight, throttle constant, and absolutely not touching the brakes. Gave me a good fright, I had stop and compose myself.

ABSOLUTELY SPEWING I didn't have the camera with me.. would've been nice to record the save

 

It's things like that remind us to be cautious and alert at all times.... Glad you did not come off or drop it

 

I would have exploded and broke something!! Dropped after one day on the road!?

 

I spent the afternoon moving my entire shed. Again. For the 3rd Time. In just under 2 years

I was actually kinda amazed it all fit.
Can't wait to set the new shed up and try to finish this bloody bike haha

 

picked up a bike for a member on here, check out the keyring

 

Get a two stroke and say goodbye to timing chains

 

Had some idiot try and take me out today.
This was the result


I am fine, short of a bruised hip but goddamn idiots running lights...

But my bad day was made better by this!


Epic keyring tag!

 

Spewing, you okay ?

 

Ahh crap that's no good, too many morons that don't deserve a license on the road... when I commute, I keep my gopro on my helmet, surprise surprise you run into a lot less fuckwittery

 

Unpacked and ready for race weekend had few beers with mark(brizfox) he tired but loved the experience and can't wait for racing to start he is quick on the 74 we might change gearing tomorrow to suit mp bit better with some of my spare sprockets keep updated on my race page pat mclaren bulldog racing!!! Will post tomorrow after the day's events on here with updates

 

Sweet, you 2 are pretty well matched time wise, no bumping panels okay