OzVMX Forum

Clubroom => Tech Talk => Topic started by: Bitten on January 27, 2011, 12:16:58 pm

Title: Engine flush
Post by: Bitten on January 27, 2011, 12:16:58 pm

Hi All

I am about to take delivery of a bike sourced in the US (RM465Z). If all is as it should be it should be just about race ready and I am looking forward to dipping my toe into a few VMX events this year.

The top end has been rebuilt and cosmetically it is looks pretty good  (in the photos!!) As far as I am aware the seller drained the crankcase of oil for shipping, and it could be up to 2 months since it has had oil in it.

Newby question but ......should I flush it out before refilling with oil and if so what product ...  off the shelf product......Kero?

Thanks in advance

Title: Re: Engine flush
Post by: matcho mick on January 30, 2011, 10:41:00 pm

if 4 stroke,el cheapo multigrade just to circulate & warm up the motor,dump,replace oil filter,good oil n go,if 2 smoke,just replenish gearbox oil n go,fugg the kero trip ;), :P

Title: Re: Engine flush
Post by: oldyzman on January 30, 2011, 10:57:05 pm

Would seemlike its a 2 stroke being an rm465. I would just use a 10wt full synthetic 2 stroke gearbox oil, say silkoline or motul about $20 per litre.
Brett

Title: Re: Engine flush
Post by: BAHNZY on January 30, 2011, 10:59:30 pm

For the sake of a base gasket i'd be taking the top end off and seeing what the "real" state of play is. If it's come from the states, crossed the equator and been in a container, surface rust could be an issue. It will also give you a chance to check the bottom end as well. Replacement of the gearbox oil with basic gearbox oil should be fine, but don't be in a rush to start and ride it cause the clutch will be bound up.

Title: Re: Engine flush
Post by: Lozza on January 31, 2011, 12:07:19 am

Why wouldn't you split the cases and spend $60 on new bearings?

Title: Re: Engine flush
Post by: Bitten on January 31, 2011, 02:47:41 pm

Thanks guys

I plan to eventually pull the bottom end down and replace all the bearings and other bits as necessary later in the year but was hoping to ride a few events this year before doing so, all dependent of course on the state of the bike.

I thought it might be wise to flush out the crank case before refilling it and wasn't sure if there was a specialty product or just refill it

Cheers

Title: Re: Engine flush
Post by: jimg1au on January 31, 2011, 03:43:19 pm

i bought a yz125x with the same new top end. look throufg the port yep new.first race meeting nip up twice.
also jumping out of 1st.
apart how reason for nip up not enough piston to bore clearence.now for the gearbox.

Title: Re: Engine flush
Post by: Tim754 on January 31, 2011, 04:55:05 pm

Don't let it get it caught in the S bend, it's a prick to release.  :-[
   The new cheap oil ,warmed and dumped then replaced with fresh quality stuff is the go. If you think that will not be enough for any reason, only option for you is the remove and a full strip down. Tim754 

Title: Re: Engine flush
Post by: lc4 on February 03, 2011, 08:55:39 pm

Could never grasp the "engine flush" thing, what is a swill of kero going to do?

Title: Re: Engine flush
Post by: Bitten on February 03, 2011, 09:59:20 pm

I might be jumping at shadows but I just thought that after 2 months or so without oil crossing the planet on a ship it might gum up or some other perceived horror might befall the crankcase and if so what would be the best way to resurrect it, as to Kero... I was just throwing it out there. Thanks for the advice and I think once it gets here I will just go slow and see what condition it arrives in
Cheers to all