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Post by robadob on Jun 30, 2015 12:40:04 GMT 1
Im new to this forum and pretty much new to rd ownership too.
Quick bit of history, wiggly lines.....
Had a 1985 125lc when I was a kid, (25 years ago!) although it only lasted 3 weeks or so in my 'care' before I ruined it in a crash so went straight out and bought a low mileage Suzuki rg125 which lasted a bit longer but that went the same way as the Yamaha within a year. I then passed my test and went out and bought a really sensible first bike......Kawasaki z750 turbo! That was a shock.
Anyway, back to present day, Ive been storing a friends bike in the corner of my garage next to my 4xv R1 for a couple of months when I got a text out of the blue saying would I like to buy it?
I hadn't really even looked under the cover so a closer look was needed. The bike in question is a 1988 rd125 ypvs in black standard colours with the only deviation from stock being a new Gibson (looks like an old school Allspeed to me) pipe but the bike is in really tidy condition, its pretty mint actually so I made him an offer and have now bought it.
It comes with the correct bellypan (not fitted) a few spares and a tatty original exhaust too so is all there and hasn't been bodged anywhere either BUT it does have a couple of issues with which I need a bit of advice. One fork seal is leaking so Ill be having the forks out and doing that but the main issue is the engine. It starts first kick and runs fine but the bottom end has a rumble which I think is crank bearings. Its been stood for a while so I imagine thats why, either way the engines got to come out and a strip down is required so thats really my first question; How easy are these motors to rebuild?
Im a pretty competent mechanic, did the valve clearances recently on the R1, fitted forged pistons and rods to my car this year too so not a complete numpty but havent stripped one of these down completely before so could do with some advice from those that have.
So whats the best manual or is there a PDF file that covers my bike?
Im not even sure which model I have! Mk3??? how do I tell?
Main question, where do I get parts from? loads on eBay but I think Id rather buy OE rather than pattern parts.
Any advice gratefully received.
Ill post up some pics when I can work out how to do it!!!!
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Post by crm on Jun 30, 2015 17:15:29 GMT 1
Rob - welcome glad you joined us
send us a pic if you want - is it identical on mine (on the PB thread?) or have black wheels
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Post by raven13 on Jun 30, 2015 19:39:47 GMT 1
the engines are really easy to work on, if its the ypvs then its a mk3, where possible get gen yam parts or have a word with norbo (this is his forum.) he runs a parts shop for lc's and ypvs homepage.ntlworld.com/ultimatelccrazy/html/for%20sale%20link%20page.htmlif its been stood then crank bearings and seals will probly both need doing, but its only a couple of hours work and that includes removing and refitting the engine, |
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Post by robadob on Jul 1, 2015 9:29:36 GMT 1
Thanks for the info on parts Raven13, engines coming out today so Ill clear a spot on the work bench and see whats what.
CRM, mine has black wheels with a polished rim, black bodywork too Ill sort some pics before the motor comes out.
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Post by robadob on Jul 1, 2015 12:19:35 GMT 1
 Heres a picture as it stands. |
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Post by ozzy on Jul 1, 2015 15:32:45 GMT 1
tidy rob.
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Post by fifty50 on Jul 1, 2015 18:10:03 GMT 1
very nice.
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Post by broughton71 on Jul 1, 2015 19:34:59 GMT 1
i she looks a gud un
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Post by robadob on Jul 2, 2015 12:55:32 GMT 1
Ok, got the engine out yesterday afternoon, great to notice that the frame and running gear are all in lovely condition with no bodges, cracked panels or hidden damage so took the engine off to the work bench and got stuck in. Externally the engine looked great so started at the top and worked down......  Considering the bike was a runner with what sounded like a bottom end rumble........  Heads taken a battering too. Bore actually looks (initially) pretty good and may well have escaped the carnage but will need a closer look to confirm. Piston has 1.50 stamped into the crown (along with loads of melted alloy!) so its been rebored at some point but the odd thing is all the gaskets look new, the oil and water pump are both new as well and its supposed to have been recently rebuilt (previous owner reckons it was 100 miles into running in when this happened, not convinced though) so not sure whats gone on. Strip down came to a halt as my flywheel puller doesnt fit so have ordered a new one. Con rod seems to have too much play (to me) and has a definite tight spot when rotating, wether this is down to ingesting molten alloy from the piston or just wear, either way the cases need splitting. I bought the bike knowing it'd need a big strip down so not really that dismayed but in for a penny and all that so now I need to order some bits. Couple of questions, Im guessing that my barrel has been rebored 1.5mm oversize, does that sound right? Wondering what my options are here? I'd like to get the crank assembly rebuilt, can anyone recommend a company to sort this or can most engineering firms sort it??? Also, what could have caused this as Id rather not have it happen again! |
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Post by robadob on Jul 4, 2015 9:48:35 GMT 1
Im going to send the barrel, head and crank off to get sorted but Im concerned the head maybe too far gone, Im guessing I need a 10w head so where (if needed) would be the best place to source one???
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Post by broughton71 on Jul 4, 2015 11:02:56 GMT 1
dont think its a 10w mate far as i no that was for the mk1 yours is a mk3 you could try in the wanted section see if u get any look.
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Post by robadob on Jul 4, 2015 12:29:30 GMT 1
Ah ok. Bit new to all this so not even sure what my Aug 1987 Mk3's official designation is!
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Post by crm on Jul 4, 2015 17:50:36 GMT 1
1GU perhaps ?
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Post by justinglos on Jul 6, 2015 14:30:12 GMT 1
hi it the same as mine the parts you want are 1gu
norbo should be able to help you he s always come good for me or look on the german ebay where my mk3 came from had lots of parts from there
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Post by robadob on Jul 6, 2015 15:46:56 GMT 1
Yep, just sorting my order from Norbo so all good there.
Ill have a peek at the German eBay too.
Thanks
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Post by museumman on Jul 30, 2015 22:33:27 GMT 1
Ok, got the engine out yesterday afternoon, great to notice that the frame and running gear are all in lovely condition with no bodges, cracked panels or hidden damage so took the engine off to the work bench and got stuck in. Externally the engine looked great so started at the top and worked down...... Considering the bike was a runner with what sounded like a bottom end rumble........ Heads taken a battering too. [ so its been rebored at some point but the odd thing is all the gaskets look new, the oil and water pump are both new as well and its supposed to have been recently rebuilt (previous owner reckons it was 100 miles into running in when this happened, not convinced though) so not sure whats gone on. Strip down came to a halt as my flywheel puller doesnt fit so have ordered a new one. Con rod seems to have too much play (to me) and has a ]Also, what could have caused this as Id rather not have it happen again! Someone's dropped something in the bottom end when rebuilding it by the looks of it unless you find an obvious piece broken. Those head nuts dont look standard so it was done in UK. That's a Swiss bike, it could have been imported by me. I've only ever sold the mk3s with untouched engines, or at least dealer serviced where you'd never know. Anything touched is gladly dismantled for spares. |
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Post by robadob on Aug 26, 2015 11:29:32 GMT 1
Yep I thought that too. I did find the power valve had one peg missing and there was an extra steel ball bearing (clutch shaft) rolling around in the sump too.
Also found the barrel was beyond 2.00 oversize so will need re linering at a later date and the crank was full of debris too so thats been rebuilt by PJME. The motor had new gaskets and seals fitted by the previous owner but cant get my head round him using a barrel and piston that were so worn, doesnt make sense.
Bottom end is now back together and barrel and piston are waiting to be refitted so I hope to have it running this weekend.
Logbook and Fowlers in Bristol say its a UK bike not Swiss.
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Post by museumman on Aug 28, 2015 22:07:04 GMT 1
Is it a 2HK or 1GM ?
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Post by robadob on Aug 29, 2015 11:05:00 GMT 1
1gm
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Post by jorjasfather on Aug 29, 2015 12:29:26 GMT 1
Hi mate the 1GM is a none power valve model unless someone has done a conversion on it I might be wrong
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Post by museumman on Aug 30, 2015 12:00:32 GMT 1
so they've literally thrown the ypvs parts at a UK MK2.
A bit late now, but Ive got some complete engines I can sell
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Post by robadob on Sept 1, 2015 13:53:46 GMT 1
Ok, need to check this a bit more.
The bike is a UK model according to insurance company and logbook. Bike is a matching numbers machine so its not a cobbled together mk2 or the numbers wouldnt match.
I guess I got the model designation wrong at 1GM.
Seriously, does it look like a cobbled together bitsa??
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Post by museumman on Sept 1, 2015 20:56:00 GMT 1
if its a 1GM bottom end, they had different ignition systems to the 2HK and 1GU, so check the CDi unit, stator and flywheel part numbers, its quite a big conversion including a longer con-rod and different balance shaft
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Post by robadob on Sept 3, 2015 11:32:11 GMT 1
Had the crank rebuilt by PJME and they fitted a mk3 conrod kit and bearings. All engine parts were ordered off the chassis number which matches the logbook.
Engine is now in the frame and running so not going to strip it back down to have a look at the flywheel or stator.
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Post by jorjasfather on Sept 3, 2015 13:26:29 GMT 1
Unless someone has used a 1gm crankcase when it was rebuilt by a previous owner and every thing else is power valve just thinking out loud is it possible
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Post by robadob on Sept 3, 2015 15:22:27 GMT 1
Ok, got the logbook and....its 2hk. Double checked engine and chassis numbers and they both match each other and match the logbook.
Bike is also declared new at first reg, not imported.
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Post by museumman on Sept 4, 2015 11:40:15 GMT 1
Tell people you've got a '2HK' or 'MK3' 2HK was the 3rd model to hit the UK, thus called the MK3, so having the YPVS barrel is correct and a nice bike to have as you dont see many UK market YPVS bikes. Matching numbers is desirable and a base for originality. I would Keep it as original as possible or at least tastefully modded/personalized i.e your after market pipe. IIRC the UK MK3 bikes only came with Gold wheels and yours has indicators only fitted to the Japanese models. Also the UK bike didnt have the ypvs servo or ECU fitted so still had 'energy induction' written on side panels, and were still restricted to 12HP The Mk3 was also unique in having a sportier looking exhaust with silver removable end can, compared to the MK1/MK2's tapered end Black pipe. (the Europeans got all of this on their MK2s with Black wheels and working ypvs, so can be confusing) The Gold wheel production run also saw a new colour scheme introduced, white bike, with blue and yellow stripes. 2HK model - UK   |
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Post by robadob on Sept 4, 2015 14:56:57 GMT 1
Ok, now Ive confirmed it is a mk3 heres a bit of an update. Chassis minus the important bit...  Engine rebuilt with fresh crank and bearings, barrel rebored and fitted with new piston, complete gasket and bearing set.  Engine in frame...  Bike as it now stands.  Few jobs still to do, tank and belly pan (not fitted) has been painted but no graphics yet and front brake is pretty crappy but it started easily and idles well so did 4-5 full warm up and cool downs and then decided it was time for a ride. Bit of a shock these little tiddlers, nothing below 4k then starts to clear its throat at 5-6k (very light throttle obviously) and then a gear change but the carburation is a little....crude. Bottom end is ok but once its on the needle it cant decide wether to accelerate or not, sometimes fine, sometimes takes a breath of fresh air (feels like this) Think Ill have a look at the needle tonight. |
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Post by robadob on Sept 4, 2015 15:00:53 GMT 1
And thanks for the info Museumman, had a chat with the previous owner and he didnt like the gold wheels so went for black centres and polished edges and I think Ill be keeping them. No idea about the indicators if Im honest but have found some new 'Energy induction' graphics in the box that came with the bike.
Need to sort the carb settings really and get some miles on it, done under 50 at the mo!
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Post by museumman on Sept 4, 2015 16:04:01 GMT 1
I dont know what carbs the UK bikes had, the spec sheet says a Mikuni 24 which I think is wrong (from the MK2), the imports have 26mm, what's yours got? looks the right one with the heater pipes and white breather nozzle, should be very small number stamp on right side above oil inlet.
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