500 Two-Stroke Tech

Luther wrote: ↑Sat Sep 16, 2023 2:06 pm All 4 look like that?? Well the pin should slip around in a warm piston. That should keep it from showing uneven wear. It looks like the bearing cage is dragging at the ends and my bet is distorted or just badly made cage

Luke

Yes, all four are the same

Cranks rebuilt by Grampian supplied with small end bearings Pistons from Yambits who get them from Grampian video https://www.youtube.com/shorts/tW7JJgv_43I So first start and it sounded like a four stroke with a timing belt out by a tooth Took it apart to inspect and couldn't see anything but didn'...

I've emailed Athena to see if it is something would consider making head gaskets and full case sets.

At some point the OEM gaskets will run out

If I get a reply I'll respond here

Thanks for the reply

DOH !!! Happy Days, we have a separation. No not her indoors but the crankcases. Two hours of warming and there apart and then looked for the pry points. Just had to remove two more bolts underneath by the shock I'd missed. Bolts 13 & 14 I think the numbers are. No crankcases were harmed with al...

Doing a re-bore and the guru tells me to go for 2ma or 2rk (early ones) and not to worry about windows for the upper pistons.

So who has the part numbers please for both types

TIA

Thanks guys. Will have a look for these pry points
Will have to beg steel or borrow a rawhide mallet from my brother
Will also heat the case before starting

Is this the reason bolts 15 & 16 are barstewards to free off? Both are open to the elements under the lower case. Crud doesn't get in but moisture will attack and work it's way up the threads. Filling with grease won't help as the warmth from the engine will probably make it runny I plan putting...

Best method to part them now I have all the bolts out? Last time I did this I sealed them with the product Allen Millyard uses, Permatex ultra grey and they are now being a pain. Shame Yamaha didn't instill some 'jacking' points so they could be jacked apart to help with separating them😡, or did the...

I'd change the mirrors for some RZV type or some R1 style and change those hideous upper silencers

https://www.ebay.co.uk/itm/175171229566 ... 500%7C7000

lost1750GTV wrote: ↑Thu Jan 20, 2022 11:42 am
"Shot"
Yours don't sound shot, maybe just need cleaning up.

Yes mine are fine and just need a clean

I was referring to any that are beyond use / repair

Has anyone got a solution if the OEM ones on the bike are shot? Fortunately both my lower ones reached from the lower cylinder head came free after two days wait and good old WD40 The uppers were screwdriver tight. On the lower set I used a 7mm socket to get them free. Thought for a minute the previ...

Which other Yamaha models use the same length indicators?
Not looking for the oblong RD indicators
TIA

Done by Craig Whipps
https://www.youtube.com/watch?v=937Itn96rEg

Yamaha only as fancying a water cooled 'new' build but will need to be from 350cc so I can get to at least 525cc or over
Would be USD Forks and single shock rear
May consider selling the RZV500R to get one put together