Yamaha RD350LC restoration.
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- mangocrazy
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Yamaha RD350LC restoration.
As I've mentioned elsewhere, I paid my £100 deposit on a 350LC in late 1979 and patiently waited. And waited. Then waited some more. I finally got my hands on it in August 1980 and it was the only bike I owned for the next 9 years (times wuz hard). Being a two-stroke (and being owned by me) it suffered a number of mechanicals along the way, holing a piston in Spain in 1981 being the lowest point. I only found out many years later that there had been a recall to completely replace the carbs on the very first batch in the country, but inexplicably my dealer hadn't told me about it. Probably because he was a robbing sod who ripped everybody off until he finally got caught bang to rights. No names, no law suits...
Anyway, in 1989 a couple of things happened. In June of that year I bought a brand new VFR750-FK (times had improved). Around the same time, and doubtless in a fit of jealousy, the LC spat its dummy. The LH cylinder barrel exhaust flange parted company with the rest of the barrel, as I found out when I stripped it. Being the dutiful, conscientious type that I am, I promptly left the half-stripped engine to fester on the floor of the lockup garage for the next 20-odd years. Yes, I know...
It would probably still be there now if the garage owner hadn't sold the block of garages and told everyone they needed to vacate. As a result the motor (and lots of other tat) got relocated to my cellar (the motor), hallway (the LC rolling chassis) and various other locations in the house. The wife was understandably elated at these developments...
So - long story short, it's time to fix the motor. As you can see, this will not be a trivial matter. What you can't see here are the cylinder barrels (that's a topic for another day). It's the bottom end strip down that starts here. I'll update this as and when, but don't expect meteoric progress. Or in fact, much progress at all. Here are the pictures. First up, RH (clutch) side of motor:
Next up LH (alternator) side of motor.
Close-ups of the general decrepitude:
And lastly, a glimmer of hope. The internals ain't that bad:
Anyway, in 1989 a couple of things happened. In June of that year I bought a brand new VFR750-FK (times had improved). Around the same time, and doubtless in a fit of jealousy, the LC spat its dummy. The LH cylinder barrel exhaust flange parted company with the rest of the barrel, as I found out when I stripped it. Being the dutiful, conscientious type that I am, I promptly left the half-stripped engine to fester on the floor of the lockup garage for the next 20-odd years. Yes, I know...
It would probably still be there now if the garage owner hadn't sold the block of garages and told everyone they needed to vacate. As a result the motor (and lots of other tat) got relocated to my cellar (the motor), hallway (the LC rolling chassis) and various other locations in the house. The wife was understandably elated at these developments...
So - long story short, it's time to fix the motor. As you can see, this will not be a trivial matter. What you can't see here are the cylinder barrels (that's a topic for another day). It's the bottom end strip down that starts here. I'll update this as and when, but don't expect meteoric progress. Or in fact, much progress at all. Here are the pictures. First up, RH (clutch) side of motor:
Next up LH (alternator) side of motor.
Close-ups of the general decrepitude:
And lastly, a glimmer of hope. The internals ain't that bad:
Re: Yamaha RD350LC restoration.
Do we introduce the tumbleweed to this now or 6 months from now?
- mangocrazy
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Re: Yamaha RD350LC restoration.
You obviously recognise the timescales I work within, Ben...
Progress is liable to be erratic, is all I can say...
Progress is liable to be erratic, is all I can say...
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Re: Yamaha RD350LC restoration.
Well... I've seen worse....mangocrazy wrote: ↑Fri Jan 03, 2020 10:30 amAs I've mentioned elsewhere, I paid my £100 deposit on a 350LC in late 1979 and patiently waited. And waited. Then waited some more. I finally got my hands on it in August 1980 and it was the only bike I owned for the next 9 years (times wuz hard). Being a two-stroke (and being owned by me) it suffered a number of mechanicals along the way, holing a piston in Spain in 1981 being the lowest point. I only found out many years later that there had been a recall to completely replace the carbs on the very first batch in the country, but inexplicably my dealer hadn't told me about it. Probably because he was a robbing sod who ripped everybody off until he finally got caught bang to rights. No names, no law suits...
Anyway, in 1989 a couple of things happened. In June of that year I bought a brand new VFR750-FK (times had improved). Around the same time, and doubtless in a fit of jealousy, the LC spat its dummy. The LH cylinder barrel exhaust flange parted company with the rest of the barrel, as I found out when I stripped it. Being the dutiful, conscientious type that I am, I promptly left the half-stripped engine to fester on the floor of the lockup garage for the next 20-odd years. Yes, I know...
It would probably still be there now if the garage owner hadn't sold the block of garages and told everyone they needed to vacate. As a result the motor (and lots of other tat) got relocated to my cellar (the motor), hallway (the LC rolling chassis) and various other locations in the house. The wife was understandably elated at these developments...
So - long story short, it's time to fix the motor. As you can see, this will not be a trivial matter. What you can't see here are the cylinder barrels (that's a topic for another day). It's the bottom end strip down that starts here. I'll update this as and when, but don't expect meteoric progress. Or in fact, much progress at all. Here are the pictures. First up, RH (clutch) side of motor:
DSC_3788.JPG
Next up LH (alternator) side of motor.
DSC_3796.JPG
Close-ups of the general decrepitude:
DSC_3791.JPG
DSC_3793.JPG
And lastly, a glimmer of hope. The internals ain't that bad:
DSC_3807.JPG
- mangocrazy
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Re: Yamaha RD350LC restoration.
And just to prove that I have been making (slow) progress on the dismantling, here's the LH (alternator/drive) side of the motor, minus alternator stator/rotor, minus gearbox sprocket and minus cylinder studs.
For every one of those components I needed my trusty electric windy gun to shock the offending item free. Without it (and with the engine out of the frame) I would have stood no chance with the sprocket nut and similarly with the rotor. It's worth its weight in gold in situations like these. This is the tool:
https://www.machinemart.co.uk/p/clarke- ... ct-wrench/
The next phase of the strip-down is waiting on some Vessel cross head impact bits to arrive all the way from Japan. You only get one chance with these cross-head screws (made as they are from cheese) and they're coming out first time...
For every one of those components I needed my trusty electric windy gun to shock the offending item free. Without it (and with the engine out of the frame) I would have stood no chance with the sprocket nut and similarly with the rotor. It's worth its weight in gold in situations like these. This is the tool:
https://www.machinemart.co.uk/p/clarke- ... ct-wrench/
The next phase of the strip-down is waiting on some Vessel cross head impact bits to arrive all the way from Japan. You only get one chance with these cross-head screws (made as they are from cheese) and they're coming out first time...
- mangocrazy
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Re: Yamaha RD350LC restoration.
Well, the Vessel impact bits arrived today and they worked like a charm. Those cross head screws never stood a chance. Once thet and the parts they retained were off and bagged, it was time for the crankcase bolts. The M8 fastenings on the underside of the crankcase around the crank had been in place for around 35 years and they didn't give up without a fight, but they had to give best. With those and the M6 bolts on the top crankcase undone, it was time for some strategic blows with a rubber mallet and bits of wood. It wasn't long before a unit separated into two halves, as you can see below:
Now the real work starts and the piggy-bank gets raided. This will not be cheap or quick. But it will be messy.
Now the real work starts and the piggy-bank gets raided. This will not be cheap or quick. But it will be messy.
Re: Yamaha RD350LC restoration.
Well done Graham, that deserves a tipple or two
Cleverly disguised as an adult !
- mangocrazy
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Re: Yamaha RD350LC restoration.
Cheers Paul. I'd be lying if I tried to make out I hadn't awarded myself a well-earned libation or three...
Anyway, to everyone's surprise (not least of all me) things are actually movng along. The crankcases and crankcase covers went off to Shropshire Powder Coating (they feature quite heavily in episode 29 of Project Binky) for vapour blasting and powder coat and came back almost unrecognisable from their former state. The insides of the crankcase halves:
And the outsides. These were in a disgusting state...
The side covers (outer) restored to as new condition:
And the inners of the side covers:
At roughly the same time the barrels and crank went off to Gerry Pell for him to get the barrels rebored (now + 0.75mm) and supply new (quality Japanese) pistons. Gerry also worked his way through the crank, replacing the big ends with YPVS items, replacing main bearings and fitting rod kits and balancing the crank (something of a dying art). There's not a great deal that's original about the crank now.
Next step is to tap all threads and blow them out with an air line (vapour blasting residue is not stuff you wish to leave in threads), clean up the powder coating flash where holes were plugged and clean up bits of overspray. I'm also getting the original bolts and studs de-rusted, cleaned and re-plated. I'm toying with having the new pistons coated with some hi-tech wizardry that doesn't actually increase the dimensions of the pistons; the coating sinks into the surface...
And then I can start to think about the rebuild. Oo-er, missus...
Anyway, to everyone's surprise (not least of all me) things are actually movng along. The crankcases and crankcase covers went off to Shropshire Powder Coating (they feature quite heavily in episode 29 of Project Binky) for vapour blasting and powder coat and came back almost unrecognisable from their former state. The insides of the crankcase halves:
And the outsides. These were in a disgusting state...
The side covers (outer) restored to as new condition:
And the inners of the side covers:
At roughly the same time the barrels and crank went off to Gerry Pell for him to get the barrels rebored (now + 0.75mm) and supply new (quality Japanese) pistons. Gerry also worked his way through the crank, replacing the big ends with YPVS items, replacing main bearings and fitting rod kits and balancing the crank (something of a dying art). There's not a great deal that's original about the crank now.
Next step is to tap all threads and blow them out with an air line (vapour blasting residue is not stuff you wish to leave in threads), clean up the powder coating flash where holes were plugged and clean up bits of overspray. I'm also getting the original bolts and studs de-rusted, cleaned and re-plated. I'm toying with having the new pistons coated with some hi-tech wizardry that doesn't actually increase the dimensions of the pistons; the coating sinks into the surface...
And then I can start to think about the rebuild. Oo-er, missus...
Re: Yamaha RD350LC restoration.
Almost unbelievable transformation, what a bloody good start !
Cleverly disguised as an adult !
Re: Yamaha RD350LC restoration.
That engine looks fantastic hat is off to you Sir, :D
I hate it when people ask if you have a bathroom, I want to say "No we pee in the garden"
- mangocrazy
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Re: Yamaha RD350LC restoration.
Thanks chaps, I have to stress that I just farmed the work out, I didn't do it myself. But most things are a case of who you know, rather than what you know...
Having said that, I did clear off all the chain-lube related gunge and gave the crankcases and covers a good soaking in Jizer, hot soapy water and Shiny Sauce. I know that blasting companies really don't like massive amounts of grease contaminating their blast media. But the real transformation was due to the vapour blasting and powder coat.
Having said that, I did clear off all the chain-lube related gunge and gave the crankcases and covers a good soaking in Jizer, hot soapy water and Shiny Sauce. I know that blasting companies really don't like massive amounts of grease contaminating their blast media. But the real transformation was due to the vapour blasting and powder coat.
Re: Yamaha RD350LC restoration.
Stop being so modest Graham. Media blasting and the type of engineering work are not the sort of thing the average bod does in his shed, working out what needs to be done then getting it done is the major part.
I'm more than sure you deserve to pull the cork on another one!
I'm more than sure you deserve to pull the cork on another one!
Cleverly disguised as an adult !
- mangocrazy
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Re: Yamaha RD350LC restoration.
Thanks Paul. I did take your advice...
It's now got to the point where all the bits are back from the various makers, shapers, platers and fabricators, so I haven't really got any excuse to sit around with my thumb up my arse. I recently collected the refurbished crank, rebored barrels and pistons and rings from Gerry Pell, and also collected the crankcase studs and bolts after their trip to the platers (see photo below).
So the next step is to Loctite the crankcase studs in place and start putting the bits back inside the crankcases. This is where the fun starts. It's well over 30 years since I rebuilt an LC engine. Thankfully I do have the Haynes book of lies to refer to...
In case you're wondering the M8 studs have been 'yellow' zinc passivated and the M6 bolts have been electroless nickel plated.
It's now got to the point where all the bits are back from the various makers, shapers, platers and fabricators, so I haven't really got any excuse to sit around with my thumb up my arse. I recently collected the refurbished crank, rebored barrels and pistons and rings from Gerry Pell, and also collected the crankcase studs and bolts after their trip to the platers (see photo below).
So the next step is to Loctite the crankcase studs in place and start putting the bits back inside the crankcases. This is where the fun starts. It's well over 30 years since I rebuilt an LC engine. Thankfully I do have the Haynes book of lies to refer to...
In case you're wondering the M8 studs have been 'yellow' zinc passivated and the M6 bolts have been electroless nickel plated.
- BikerGran
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Re: Yamaha RD350LC restoration.
Thoses casings look brand new!
The tragedy of old age is not that one is old, but that one is young.
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