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Post by philmill on Jan 12, 2021 17:01:11 GMT 1
So my day is going from bad to worse. Having got the enthusiasm to go out and sort my garage and get on with some of my unfinished projects I started stripping my 500, (i've had it for 7 years now, bought from a dealer through eBay but too long ago now to be able to do anything) I've pulled the motor and stripped most of the cycle parts a while ago so today I thought I'd have a proper look at the motor and start stripping, I just happened to look for the engine number for some reason and what do I find but a smooth panel with 51x and nothing else  . I'm guessing 500's should have the "ribbed" areas like other Yamaha's along with of course a full number. This kinda puts the value go the bike through the floor, so I don't even know if it's worth spending the money of a full restoration. Phil |
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Post by midlifecrisisrd on Jan 12, 2021 17:04:19 GMT 1
Jap imports have engine prefix only on the 250/350's
Maybe the same for 500's
Is it an import? Not up on 500 numbers
Steve
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Post by philmill on Jan 12, 2021 17:04:38 GMT 1
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Post by philmill on Jan 12, 2021 17:05:39 GMT 1
It is an import Steve, if thats the case I'll be a very happy chappy!!
Phil
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Post by muttsnuts on Jan 12, 2021 17:32:18 GMT 1
if its an import then they only have the prefix - 51x in your case and generally no ribbing either
If it had said 47X or 1GE, then you would be worried as they are UK prefixes and should be ribbed and have the usual 6 digits after the hyphen
HTH
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Post by philmill on Jan 12, 2021 17:38:30 GMT 1
if its an import then they only have the prefix - 51x in your case and generally no ribbing either If it had said 47X or 1GE, then you would be worried as they are UK prefixes and should be ribbed and have the usual 6 digits after the hyphen HTH Thats great news, I was really p**sed off when I saw it. Phil |
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Post by LC_BOTT on Jan 12, 2021 19:14:50 GMT 1
Yes that sounded like me too, did you buy one of those brought over in a big batch, that featured in MCN?
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Post by philmill on Jan 12, 2021 19:37:38 GMT 1
Yes that sounded like me too, did you buy one of those brought over in a big batch, that featured in MCN? No, this one had had a basic restoration but whoever did it used all the old rusty nuts and bolts and cross-threaded a load too. It's got a half decent Kenny Roberts paint job at least. All I need to figure now is how to get the flywheel off, its solid! I hope I dont have to cut it off like I did my 31K. Phil |
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Post by muttsnuts on Jan 12, 2021 20:58:33 GMT 1
you need the proper puller to get the flywheel off, its a 3 legged one that is offset, it bolts into the flywheel and pulls equally from the centre, I have one, works a treat, Yambits sell them I think
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Post by philmill on Jan 12, 2021 21:09:42 GMT 1
you need the proper puller to get the flywheel off, its a 3 legged one that is offset, it bolts into the flywheel and pulls equally from the centre, I have one, works a treat, Yambits sell them I think I've got that one, still cant shift it.... Phil |
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Post by muttsnuts on Jan 12, 2021 21:15:05 GMT 1
you need the proper puller to get the flywheel off, its a 3 legged one that is offset, it bolts into the flywheel and pulls equally from the centre, I have one, works a treat, Yambits sell them I think I've got that one, still cant shift it.... Phil um, leave it on overnight under tension, have you tried hitting the centre screw you tighten up with a copper mallet while under tension, or do you have an impact driver/wrench, if so, try whizzing that up and loosening etc several times (oil the threads of the screw first), the shock normally moves it, sounds like its never been off if its that stuck ! |
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Post by JonW on Jan 13, 2021 0:12:19 GMT 1
Check for 51X info on the RDRZ500 forum Phil. Its an RZV from Japan.
Whats the frame prefix for the bike? also a 51X?
FWIW the Aussie 53G engines also have a non ribbed engine number, but they do have full numbers not just the prefix.
The yambits puller worked well for me, it was only a tenner i think for anyone seeing this later, get one as you will need it to do this job.
Defo do as Dave says, as usual with a recalcitrant flywheel: lots of impact gun 'on and off', taps with the hammer for good measure and then leave it under tension for a bit and see if that shifts it. It will eventually let go.
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Post by philmill on Jan 13, 2021 9:38:33 GMT 1
Check for 51X info on the RDRZ500 forum Phil. Its an RZV from Japan. Whats the frame prefix for the bike? also a 51X? FWIW the Aussie 53G engines also have a non ribbed engine number, but they do have full numbers not just the prefix. The yambits puller worked well for me, it was only a tenner i think for anyone seeing this later, get one as you will need it to do this job. Defo do as Dave says, as usual with a recalcitrant flywheel: lots of impact gun 'on and off', taps with the hammer for good measure and then leave it under tension for a bit and see if that shifts it. It will eventually let go. Hi Jon, thanks for that info, I'm going to have a day out in the garage today, feeling a whole heap better now knowing the Engine number is correct. The frame on the 500 is a 47X from memory, I will check later. I'll have a go at the flywheel again today too. |
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Post by 29davyt on Jan 13, 2021 9:50:49 GMT 1
Pardon my ignorance but does this mean there’s no way of telling if the frame and engine number are matching ? I know other manufacturers don’t bother with this but did think most Yamaha’s were ??
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Post by beardy on Jan 13, 2021 9:51:48 GMT 1
I remember it took me five days to get the rotor of my XT 500. Did as above, left it under constant tension and a whack with a copper hammer and another slight turn of the puller every day. Finally it just gently came of in my hand.
Glad your engine number puzzle got sorted too 👍🏻
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Post by midlifecrisisrd on Jan 13, 2021 10:09:45 GMT 1
Pardon my ignorance but does this mean there’s no way of telling if the frame and engine number are matching ? I know other manufacturers don’t bother with this but did think most Yamaha’s were ?? In Japan the don't have a requirement for an engine number Each case has the prefix and on assembly they stamp the engine to match the frame As they don't need the number they don't do it so as you say there is no way of knowing the engine cases are original or not Steve |
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Post by philmill on Jan 13, 2021 10:26:18 GMT 1
Check for 51X info on the RDRZ500 forum Phil. Its an RZV from Japan. Whats the frame prefix for the bike? also a 51X? FWIW the Aussie 53G engines also have a non ribbed engine number, but they do have full numbers not just the prefix. The yambits puller worked well for me, it was only a tenner i think for anyone seeing this later, get one as you will need it to do this job. Defo do as Dave says, as usual with a recalcitrant flywheel: lots of impact gun 'on and off', taps with the hammer for good measure and then leave it under tension for a bit and see if that shifts it. It will eventually let go. Hi Jon, thanks for that info, I'm going to have a day out in the garage today, feeling a whole heap better now knowing the Engine number is correct. The frame on the 500 is a 47X from memory, I will check later. I'll have a go at the flywheel again today too. So I have got 51X frame and Engine so thats good! Phil |
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Post by philmill on Jan 13, 2021 12:10:00 GMT 1
So I got the flywheel off, somebody suggested pouring boiling water on the shaft while under its under load, and hey presto, POP and its off.
So next question, looking at the cases it looks as if I may be able to split the cases and remove the cranks with out a total gearbox etc strip down. Is that wishful thinking??
Phil
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Post by JonW on Jan 13, 2021 12:51:14 GMT 1
Hi Jon, thanks for that info, I'm going to have a day out in the garage today, feeling a whole heap better now knowing the Engine number is correct. The frame on the 500 is a 47X from memory, I will check later. I'll have a go at the flywheel again today too. So I have got 51X frame and Engine so thats good! Phil Phil if youve a 51X frame and engine then its all good. I'd class that as matching numbers since the JDM engines have no actual number. |
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Post by JonW on Jan 13, 2021 12:53:06 GMT 1
So I got the flywheel off, somebody suggested pouring boiling water on the shaft while under its under load, and hey presto, POP and its off. So next question, looking at the cases it looks as if I may be able to split the cases and remove the cranks with out a total gearbox etc strip down. Is that wishful thinking?? Phil No that is totally possible. You should get a manual tho and also join the 500 forum, you might want to look at sorting out the rear cranks timing when rebuilding etc. and that info is on there as is the supplier of the keys to do it (hes on here too of course, but you should defo get access to the 500 info and guys when doing this work) |
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Post by philmill on Jan 13, 2021 13:14:29 GMT 1
Thanks Jon, I will sort a manual before I go any further though. I need to get the cranks checked and do a rebore, its still on Std bores right now but looking a tired after 20,000km.
Phil
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Post by LC_BOTT on Jan 13, 2021 14:36:59 GMT 1
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Post by tacky1 on Jan 13, 2021 17:10:27 GMT 1
These are great cranks, Both my 500s have these in them and no problems with them |
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Post by philmill on Jan 13, 2021 17:50:48 GMT 1
That seems a good price, but by the time I add VAT and customs charges they start to get more expensive. I'm going to see what sort of cost mine will be, they look and feel fine, bike sounded good when I ran it so maybe they wont need much work. Suggestions on who is best? Phil |
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Post by JonW on Jan 13, 2021 20:57:54 GMT 1
These are great cranks, Both my 500s have these in them and no problems with them Are those Gus' cranks or do Vitos do their own for the 500? |
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Post by JonW on Jan 13, 2021 20:59:59 GMT 1
Thanks Jon, I will sort a manual before I go any further though. I need to get the cranks checked and do a rebore, its still on Std bores right now but looking a tired after 20,000km. Phil Around 40k kms there is one(?) crank bearing with a cut out in the outer race that destroys itself. Make sure you swap the bearings of you keep the old ones. |
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Post by tacky1 on Jan 14, 2021 2:08:12 GMT 1
These are great cranks, Both my 500s have these in them and no problems with them Are those Gus' cranks or do Vitos do their own for the 500? I believe they are the same Jon, Earlier Gus cranks had problems with the rods hitting the bottom of the cylinders, It was an easy fix, but nice if it didnt have to be done.. |
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Post by LC_BOTT on Jan 14, 2021 9:06:39 GMT 1
Are those Gus' cranks or do Vitos do their own for the 500? If you scroll down a little to the description, it explains all  Bought mine about 5/6 years ago, never had a problem after fitting, and don't remember reading anything about any issues on the forum either. Wondering if mine were the first troublesome batch now?? Got them direct from Gus when he was doing a 'big move' and selling them off cheap at the time, think I paid around £350 for both delivered to UK. |
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. I'm guessing 500's should have the "ribbed" areas like other Yamaha's along with of course a full number. This kinda puts the value go the bike through the floor, so I don't even know if it's worth spending the money of a full restoration.
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