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CB250Rs Rebuild
K2-K6:
As Bryan indicates, it's been running and we've seen worse.
To separate, obviously a route through to fully fix as described by Dave with recent experience of exactly the same is the most desirable to bring it back to technical quality. In that, you've a well researched route and recommendations for suppliers too.
To run as is, if it were for me, I'd want to redress the rocker and cam surfaces to remove (as much as possible the peaks without taking off base material) just to give them better chance of stopping pickup, one material transmission to the other component, and run with some consideration in allowing for it's recognised condition.
It appears that both the oil condition was compromised, and it's run with nil clearance on one of the tappet too.
Running with clearance set at maximum tolerance should assist it's future lifing.
The oil, obviously new is going to be used. But I'd use a specific type, VW diesel specification with code 501.01 as it was formulated for their series of engines that had conventional material in the valve train along with very high loading. Essentially it coped with this by using a tightly defined oil package that's of use here. It's particularly good at avoiding this problem.
If you're not certain about cleaning the tappet and cam surfaces, I'd offer to do that if you could get them to me.
MRA464:
Thanks Guys for all your inputs.
I will get a price for the reworks and go from there, as stated I am in no hurry.
I believe these bike will become in a few years the next collectable so best to invest now.
I will upload pics of the new bike once I get it, I will then get the cover off that one and see what its like.
I may have two that need repair !
Laverda Dave:
The good news is they are already becoming 'collectable' but I dont think they will reach giddy heights in terms of investment.
I rode mine to the Critch tramway event a couple of years ago just after I completed it. One of the stewards offered me £2,750 for it there and then! He wanted it because he was finding it difficult to kickstart his Vincents! Even though mine is a kickstart model he still wanted it, he really did want to do a deal there and then! I did offer to swap it for a Vincent though ;). Even £2,750 would not have come close to the money it cost me to restore it. The simple fact is if you are intending to restore it to make it investment grade you really will have to spend a serious amount of cash and you will not get the money back unless you put the bike into dry storage for 20 years! I restored my bike to ride it and to have fun on and it does that in bucket loads, it always produces a big grin as it feels like you are going fast even when you are going slowly!
My advice is to restore it, ride it, change the oil every 500 miles (it's only 1.3 litres), clean it properly and have the fun on it that it was intended for. If you make a few pennies after a few years you'll be laughing, you won't make a fortune but you would have had heaps of fun along the way :)
Laverda Dave:
Going back to the cases and replacing the balancer chain. The two photos will give you an idea how the cases can be split leaving the crankshaft and gears in the lower crankcase. The front balancer shaft is in the top crankcase half.
The second photo shows the new balancer chain fitted and its route between the two balancer shafts and crankshaft. The paint marks on the balance chain are there to ensure the timing marks are matched as it is easy to just be one link out and the balance will be all over the place!
andy_c101:
--- Quote from: MRA464 on February 03, 2021, 12:50:05 PM ---Thanks Guys for all your inputs.
I will get a price for the reworks and go from there, as stated I am in no hurry.
I believe these bike will become in a few years the next collectable so best to invest now.
I will upload pics of the new bike once I get it, I will then get the cover off that one and see what its like.
I may have two that need repair !
--- End quote ---
I recommend checking the splines for any backlash, on the gearbox output shaft, for the drive sprocket. Splines were completely shot on my resto project!
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