250-500cc WR 250 built thread

Nice build! Can't wait to see the end product! I have a 99 in about the same stage of rebuild. Are you using a 00/04 airbox with that subframe? or are they all the same?

Thought you were going mooussseys ???

I do- but i will have another set of wheels...

You #%*%#^#^^#%**€#%* lol fair play your doing a better job than the factory did!

I bought some Standard needle bearings- they are very easy to get and fairly cheap. Because they are not as wide as the OEM i did put 3 into each side instead of 2- that should do the job.

I found the oem ones are tighter packed asin more needles but the hk22 ones are suitsbls, think my swingarm sleeves wore early with less needles spreading the force on them.

Just keep wm dry and greased.

Thats what i thought- put one more bearing into each side to prevent the sleeves wore out to fast.

I mean the oem ones have twice asmany needles in than skf hk's
A third roller may help the situation tho, jus keep an eye on em.

Great rebuild!

I have same cylinder. Transfer ports on my cylinder are open only abou 2/3 too. I think its probably used for adjusting flow speed.
On that picture is the piston on bottom dead centre? Because it seems like there is clearance between the exhaust port and edge of the piston.

Yes- its on the bottom dead centre.

The exhaust port is fully open- but not the transfer ports.

Question, the crankshaft seal on the clutch side, how did you mount it?

In the workshopmanual it says that the spring side has to face the primary drive or clutch side.

But I'm currently rebuilding 2 WR300 engines and they both had the seals with the 'closed' (where all the letters and numbers are on, as the left one illustrated on the photo ) side facing the primary drive.

I'm confused.

This is an example, not the actual seal:

Some seals have directional rotation on them, others have lines to hold the oil away when the shafts rotating.
I go by installing the spring towards the side of higher pressure.

I have seen them both ways from the factory. I usually just install them with the springs toward the crank and numbers out.

Yup thats how i install them.

Haha, OK. Italian bikes. Fantastic... I'll mount them in the way they came out. Spring side towards crankshaft. There is no direction arrow or splined grooves inside the seal on the one I've received and the one that came out. Thanks.

Seals with spring side towards clutch is used to better seal, because in crankshaft is lower pressure as atmospheric. Sealing lip works quite better with spring facing to higher pressure.
Sorry for my English.

Yehaa! The replacement ignition did arrive! I went for the premium system. ;-) as you can see it has got a second ignition/timing curve

Where did you get that from???

HPI - Horse Power Ignition - they are from Belgium. Its the 3rd ignition i personally bought there.

That's made for the WR specifically?