Search found 22 matches

by ahistand
Tue Feb 18, 2020 10:21 am
Forum: Vintage (1948-1969) Motorcycles
Topic: Barn find R27, new member
Replies: 20
Views: 1009

Patina

That’s a really cool bike! I agree with what’s said above definitely replace the coil. While yours may work indefinitely they are a crapshoot. I’m not really crazy about the available aftermarket coils for the R27, as far as I know the Bosch isn’t available. The aftermarket ones are a slightly diffe...
by ahistand
Fri Jan 31, 2020 7:03 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Max oversize on R60/2 cylinder bore
Replies: 12
Views: 583

Pistons

Maybe in the old days when the manuals were written they only offered two oversizes. But now up to 74mm is available from all the usual suppliers as Tommy said so you got another mm to go. The cylinders are not bored on a taper. The pistons are a little bigger at the skirt than at the ring area, but...
by ahistand
Thu Jan 30, 2020 8:23 am
Forum: Vintage (1948-1969) Motorcycles
Topic: MZB Rotor Puller
Replies: 15
Views: 704

Puller

Could possibly make your own puller bolt with a shorter “no thread” portion....maybe chuck a Class 10.9 bolt up in a drill or something and use a 4 inch disc grinder to grind off some threads? Maybe a little crude but it could work.
by ahistand
Mon Jan 27, 2020 3:12 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: 1952 R51/3 fork rebuild project
Replies: 14
Views: 765

Spacer

When you say the “nut will not tighten down the top plate”, what do you mean exactly? That spacer, or washer which is all it is, shouldn’t be there, but if it was there it shouldn’t have any effect on tightening down the top plate or not. Maybe a couple photos of your specific parts would help. I’m ...
by ahistand
Sun Jan 26, 2020 8:34 am
Forum: Vintage (1948-1969) Motorcycles
Topic: Are these Tappets/Cam followers any good?
Replies: 6
Views: 351

Worn cam followers

Michael I would not re-use any of those. They all have some degree of pitting and at least one has been chipped around the edge. Also, they are the old style “4 window” type which are weaker than the newer style “2 window” type. Since your lifters are in bad shape I would also carefully inspect your...
by ahistand
Sat Jan 25, 2020 7:43 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: R51/3: Camshaft front bearing extracting - Help needed. Pictures inside.
Replies: 15
Views: 751

Do it yourself

Michael, I think you’re doing a great thing by attempting your engine rebuild on your own, and the construction of your own style of “Matra” tools shows your resourcefulness and ability to tackle this project. There is many ways that you can get information that’s helpful to your engine rebuild and ...
by ahistand
Tue Jan 21, 2020 2:02 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: Mikuni Adapter on a Cool /2 Custom.
Replies: 16
Views: 1261

Adaptor

Just check EBay type in Mikuni carb adaptor there are tons of different sizes available.
by ahistand
Mon Jan 20, 2020 9:15 am
Forum: Vintage (1948-1969) Motorcycles
Topic: R51/3 - Rear Main Bearing Holder
Replies: 12
Views: 659

Barrel bearing

The barrel roller bearing is quite expensive, and may not be worth the cost for the relatively low-stressed R51/3 engine. But that’s up to you to decide. Also, you will need yet another tool, a bearing aligner, to install the crank back into the case. It’s a very simple tool, no moving parts, which ...
by ahistand
Mon Jan 20, 2020 12:05 am
Forum: Vintage (1948-1969) Motorcycles
Topic: R51/3 - Rear Main Bearing Holder
Replies: 12
Views: 659

Bearing holder

Looking over the factory literature the only definitive spec on determining wear on the rear main bearing carrier is, it says the bearing in the carrier is a “slight pinch fit”. So this leaves plenty of room for debate on at what point the bearing carrier needs to be replaced. As I mentioned, and as...
by ahistand
Sat Jan 18, 2020 8:27 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: How to? R51/3 rear oil slinger and rear bearing
Replies: 4
Views: 300

Tool

Michael the correct and probably best tool is that Matra 282 like you’ve already found. I’ve seen a few other homemade variations of varying designs. The Many-in-one tool that CycleWorks sells includes the rear main bearing puller, however it is a quite different design than the Matra 282. The probl...