RD250LC

Post by **hybrid** » Thu Jun 19, 2014 1:52 pm

Definitely contact link on this forum.
$700 is a lot of money to rebuild a crank.

Your barrels look OK, but hard to tell from the pics if there is still a good crosshatch.
There is a little blow-by on those pistons, so it might be worth a hone and some new rings (cheap).

BTW, going +4mm is not just a matter of throwing in a new crank (even after machining the cases). Your piston will travel higher, so you would need to space the barrels up (or change piston pin location in pistons), then your port heights change and all sorts of things.

Greasemeup · Post by **Greasemeup** » Thu Jun 19, 2014 3:25 pm

To be the devils advocate, those cracks look pretty fresh, perhaps a claim against shipping company?

Dempsie · Post by **Dempsie** » Thu Jun 19, 2014 3:46 pm

I've already pulled the clocks apart, just going to cop it on the chin.

i'll have to bang those bushes out does anyone know anywhere I can get some new bushes in Australia?

Dempsie · Post by **Dempsie** » Thu Jun 19, 2014 3:59 pm

one other thing, I'm running 350 barrels on a 250 case, is it worth upgrading the oil pump or should I just run premix?

Post by **hybrid** » Thu Jun 19, 2014 4:32 pm

I run oil pumps because I hate premix.
There is a bloke in the UK who has posted in this forum that does overhauls on the pumps, and he is very reasonably priced.
Will see if I can find a link.

Edit: arrow is the username

phpBB3/viewtopic.php?t=1278&highlight=oil+pump

Jeram · Post by **Jeram** » Thu Jun 19, 2014 5:17 pm

hybrid wrote:Definitely contact link on this forum.

BTW, going +4mm is not just a matter of throwing in a new crank (even after machining the cases). Your piston will travel higher, so you would need to space the barrels up (or change piston pin location in pistons), then your port heights change and all sorts of things.

Note:+4mm stroke doesnt require crankcase machining.

JonW · Post by **JonW** » Thu Jun 19, 2014 5:33 pm

Dempsie wrote:
i'll have to bang those bushes out does anyone know anywhere I can get some new bushes in Australia?

Yamaha dealer will gouge you, buy from norbo (RDLCCRAZY) with the bunch of other stuff you will also need...

Post by **hybrid** » Thu Jun 19, 2014 5:33 pm

It does on an LC Jeram, because they are banshee/RZ cranks are slightly wider than an LC crank.

JonW · Post by **JonW** » Thu Jun 19, 2014 5:34 pm

Dempsie wrote:one other thing, I'm running 350 barrels on a 250 case, is it worth upgrading the oil pump or should I just run premix?

If you want to run a pump you will need an actual 350 one, the 250 cannot be tuned to feed enough oil.

Dempsie · Post by **Dempsie** » Thu Jun 19, 2014 6:22 pm

yeah i figured i'll have to buy a 350 pump, i just checked my swing arm and it already has brass bushes, the originals were nylon weren't they? shouldn't need to change them then.

Post by **hybrid** » Thu Jun 19, 2014 6:24 pm

Pretty sure originals were brass, but its been a while since I had a stock swinger.

JonW · Post by **JonW** » Thu Jun 19, 2014 6:33 pm

I may actually have a brand new set and even a new collar in my spares. I bought them from Norbo, so money back would be alright if you wanted them, assuming i can find them...

(Ive come to the conclusion I will never return my LC to stock LOL)

Dempsie · Post by **Dempsie** » Thu Jun 19, 2014 8:03 pm

Yeah i'll grab them off you as well as the collar Jon if you can find them,

JonW · Post by **JonW** » Thu Jun 19, 2014 10:43 pm

I'll have a dig around tomorrow for ya...

JonW · Post by **JonW** » Sun Jun 22, 2014 12:42 am

Have found the parts and bunch of others, will drop you a PM.

2 Strokes Down Under

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