Will I get my 100 ready in time for Taupo?

[F5 Dave]

Hmmm intresting I was thinking of putting the timing light on it before pulling it down. Knock gauge wasn't going off particularly.

[TZ350]

Hmmm intresting I was thinking of putting the timing light on it before pulling it down. Knock gauge wasn't going off particularly.

I don't think the over advanced surging during over run on the dyno is a deto problem, more some sort of unstable resonant induced surging. I have seen it a lot and the cure for me was a bit of retard and maybe also richen it up a touch.

[F5 Dave]

Hmm ( more hmm) hold on I was running 15* flat for testing yet it was sometimes worse at 4-5 thou. One might have twice that advance in a normal curve. But was also at higher revs.

[husaberg]

Worlds worst pic, but the cr80 from 81-81 has a 41.4mm stroke decent size mains so ends up with has overlapping shaft and pinboss
Can't find a decent pic though...... so this will have to do.
I was surprised when I seen it first time.

Thanks. That looks like virtually same webs as MB

From memory the crankpin is 18mm the wristpin 13mm
The mains are mb100 size and the crankwheels are MB50 size. but that only from memory.
The pic is pretty shit but there is about 2mm overlap at least.........

I just measured up a CR80 aircooled crankshaft.
They are about a squidgy away from 3mm undercut on the drive side bearing only.
They have a 18mm pin and the flywheels are about 78mm diameter.
I guess this makes them pretty much the same as a MB50 but I think the mains are more MB100 size

[F5 Dave]

Well l fixed the quickshifter which was playing up. Still to put a timing light on it.

[F5 Dave]

Well the timing appears to be OK and at 15* is conservative. I cleaned out the carb internal passages, fixed the muffler bracket while avoiding the inevitable.
Took the head off and the bore is a bit polished maybe scratched, and there is a tiny chunk missing from the top of the B on one side where I'd lowered it for stagger. Pools. Barrel off, remove the JB weld from the face of the transfer roof. I'll need to skim the base and raise the A if I want to get there again.

In the meantime its ready to go back together. Which only leaves the question of the surging on decell. Will cleaning the carb fix it, or do I suspect some backlash issue perhaps with the clutch which on MBs can be wobbly as heck. Maybe its gone past a point.

[speedpro]

I've had an MB motor recently make some horrible gearbox area noise. The gears and shafts were all good when inspected. The problem was in 2 areas. 1st was the idler shaft between the clutch and the balancer shaft. The end of the shaft opposite the cogs runs in the plain aluminium of the crankcase. This hole it fits into in the crankcase was badly flogged out allowing the shaft to pivot about affecting how the cogs meshed. The other problem was the plain bearing the clutch spins on. It was badly worn allowing the clutch basket to wobble about which would have been pretty ugly for the primary gears. Ideally the bush needs to be removed and the basket machined for a needle roller, I think.

[F5 Dave]

I don't have the balancer but yes that was a reason my H100 was so cheap (free) as that was making a hell noise. But that plain bearing is worn on most of my baskets. I'll have another look at my stash. I ruined one basket at the GP year before trying to shim it.

[F5 Dave]

Well that's it, not taking the 100 to Taumarunui
Mild improvement but the stuttering is still there but perhaps only in 3rd. Might have to strip it all down and inspect.

But its power spread is still a bit crap. Bored of this.

[kel]

Well that's it, not taking the 100 to Taumarunui
But its power spread is still a bit crap. Bored of this.

That's no good at all. Its also one of the reasons I won't touch my porting, I know theres more power in there, but at what cost.
The KE has had the cob webs removed and is in the back of Rob's van, hopefully the fraying clutch cable will last the weekend. See you there.

[F5 Dave]

Yeah so I can strip it down again and fix the gearbox but I'm left with a bike that performed better before the mods despite having done `the right things` and it was too peaky for Tokaroa then. I struggle to see how I've lost like 2.5hp and 500rpm spread. It actually looks like decent workmanship.
I'm not convinced its the whole story.

[TZ350]

... I'm left with a bike that performed better before the mods despite having done `the right things` I struggle to see how I've lost like 2.5hp and 500rpm spread. It actually looks like decent workmanship.

Yep .... sorry to hear your having problems but it is a very familiar story, bikes are like children, they know when to play up.

[F5 Dave]

Well finally restarted work.

There is about 4mm float on the output shaft. I've put together MB cases many times, but I suspect a washer has jumped off so strip time.

Before I do I made a plug for the non std tube ex port manifold with an o-ring & wired it in with some goop. Will leak-down test tonight maybe.

I've bought some Vinamold to pour into the transfers to check them out for shape internally where I can't see them.

[F5 Dave]

Well its not leaking. Particularly.

[F5 Dave]

Couple of teeth broken off third gear set. Poos. I have a spare. Washer was there, but one was strangely the wrong type. Its of was a km too big and the thickness was 0.8 instead of 1.5. Wonder how that got there. Actually I'm thinking back to when I bought that box separate and who I bought it off. Oh well.