Search found 168 matches

by Momus
Mon Nov 23, 2020 5:42 pm
Forum: Tech
Topic: B50 MX Gearbox Mainshaft Bearing 70-8151
Replies: 4
Views: 222

Re: B50 MX Gearbox Mainshaft Bearing 70-8151

Thank you for your comments. I eventually managed to remove the retaining ring - I was expecting it to have a round cross section but it was flat. Anyway, a new retaining ring has been ordered and I hope it will be a proper circlip! Thanks again. You dont have to hope; circlips are standard dimensi...
by Momus
Sun Nov 22, 2020 6:01 am
Forum: Tech
Topic: B50 MX Gearbox Mainshaft Bearing 70-8151
Replies: 4
Views: 222

Re: B50 MX Gearbox Mainshaft Bearing 70-8151

Drill a 3mm hole beside one end so you can get a pick under it.
by Momus
Tue Nov 17, 2020 7:55 am
Forum: Tech
Topic: Setting Valve Clearance
Replies: 8
Views: 359

Re: Setting Valve Clearance

Get your piston to top center on the firing stroke- both valves are closed and there will/should be free play in both rockers- set it to your desired clearance there. Any other way, especially winding the engine over past TDC is not recomended. It's really that easy? Should my desired clearances be...
by Momus
Mon Nov 16, 2020 7:04 am
Forum: Tech
Topic: Setting Valve Clearance
Replies: 8
Views: 359

Re: Setting Valve Clearance

Get your piston to top center on the firing stroke- both valves are closed and there will/should be free play in both rockers- set it to your desired clearance there.

Any other way, especially winding the engine over past TDC is not recomended.
by Momus
Mon Nov 09, 2020 9:43 am
Forum: Tech
Topic: Clutch Pushrod???
Replies: 17
Views: 921

Re: Clutch Pushrod???

Ian Hingley wrote: Sun Nov 08, 2020 6:15 pm
Momus wrote: Sun Nov 08, 2020 5:51 am Edit. What is with the asterisking making nonsense out of Japanese brand spelling?
It's admin humour! Kasawaki would probably get through...
It hasn't aged well.
by Momus
Sun Nov 08, 2020 5:51 am
Forum: Tech
Topic: Clutch Pushrod???
Replies: 17
Views: 921

Re: Clutch Pushrod???

7/32" ball bearings probably aren't that hard to find, but not in common hardware stores. I looked on eBay and found that some K*wasak* models used them for something or other. Got the part number off eBay and went to my local Kawi dealer who checked that number, went back to his storeroom and came...
by Momus
Fri Oct 30, 2020 5:31 pm
Forum: Tech
Topic: shims VS Thakeray washers
Replies: 14
Views: 763

Re: shims VS Thakeray washers

Sorry Beat , what do you mean with '' wrong IMO '' ? i 'm looking for new thrustwashers and it 's not easy : i find the B50 genuine parts but no '' calibrated parts '' like B25 's ones. Bearing suppliers will have them. SKF have a line of hardened 0.50 mm (020") 'side washers' in their ANWG series.
by Momus
Wed Oct 28, 2020 10:03 pm
Forum: Tech
Topic: Rebuild Compression
Replies: 23
Views: 906

Re: Rebuild Compression

If your ring end gaps are 0.100" that is your problem- they're about 5 times the wear limit.
It's a bit unlikely that number you gave is correct though.

I'd be looking for this- also B25:
by Momus
Mon Oct 26, 2020 1:52 pm
Forum: Tech
Topic: shims VS Thakeray washers
Replies: 14
Views: 763

Re: shims VS Thakeray washers

Thanks Beat . i was curious to know if this problem was very usual on the unit singles . my second photo comes from the Web by a rider wich had this problem too. i 've taken a bit from the rocker arm , a little , for the rocker bore it 's not easy Momus , may be necessary. To choice shims , what ab...
by Momus
Sun Oct 25, 2020 5:55 pm
Forum: Tech
Topic: shims VS Thakeray washers
Replies: 14
Views: 763

Re: shims VS Thakeray washers

Take a bit off the wall of the rocker box and the rocker bore and shim as required if needed to move the arm over.
by Momus
Wed Oct 21, 2020 11:12 am
Forum: Tech
Topic: Ok..now its got me mad..spark plug
Replies: 11
Views: 733

Re: Ok..now its got me mad..spark plug

Put a Mikuni VM 28 on it.

They have an enrichener circuit that can be tuned if required.

The only reason for using an Amal would be a sentimental one.
by Momus
Sat Oct 17, 2020 7:06 pm
Forum: Project bikes
Topic: LOBE 2 20-21
Replies: 55
Views: 5227

Re: LOBE 2 20-21

Jezzus- take care brother.
by Momus
Sat Oct 17, 2020 7:03 pm
Forum: Tech
Topic: 1974 tr5mx Engine Mounting Bolts
Replies: 7
Views: 483

Re: 1974 tr5mx Engine Mounting Bolts

There must be lots of bolt suppliers with UNF bolts in the USA. See chart below to find out what length you need. Plain section should go through both lugs. ScrewBolt_HexHd_UNFine_THRpart.pdf Yes mate, ordered the two shorter ones on Amazon (duh) the one that's 8 3/8" long though is not available a...
by Momus
Sat Oct 17, 2020 7:00 pm
Forum: Tech
Topic: B50 rear hub
Replies: 11
Views: 729

Re: B50 rear hub

beesa71 wrote: Fri Oct 16, 2020 1:26 pm I disagree; ‘from here’ the bearing spacer and it’s ends look fine and as mine do.

Paul.
Koncrete is talking about the bearing spacer in the hub, not the wheel spacer.
by Momus
Fri Oct 02, 2020 8:26 am
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1804

Re: tightening head nuts sequence

Hello Momus , could you explain me what your answer means ? my english is not accurate enough ... it 's a little fissure but this place receive a lot of constraints . i hesitate between loctite 271 alone and loctite 271 after a little TIG weld... many riders seem to have welded the B50 crankcase wi...
by Momus
Fri Oct 02, 2020 8:25 am
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1804

Re: tightening head nuts sequence

Hello Momus , could you explain me what your answer means ? my english is not accurate enough ... it 's a little fissure but this place receive a lot of constraints . i hesitate between loctite 271 alone and loctite 271 after a little TIG weld... many riders seem to have welded the B50 crankcase wi...
by Momus
Fri Oct 02, 2020 8:21 am
Forum: Tech
Topic: Rocker Oil Line and Finned Sump Plate
Replies: 8
Views: 611

Re: Rocker Oil Line and Finned Sump Plate

johnu wrote: Thu Oct 01, 2020 4:30 pm Momus they were probably designing the frame on a napkin in the pub at the same time :mrgreen:
Indeed.
They managed to drill deep narrow holes for the drains showing they had the capabilities. >44
by Momus
Thu Oct 01, 2020 10:07 am
Forum: Tech
Topic: Rocker Oil Line and Finned Sump Plate
Replies: 8
Views: 611

Re: Rocker Oil Line and Finned Sump Plate

Rocker and valve gear external semi drip feed is on the opposite side of the engine to the rest of the clobber :shock:

How hard would it have been to have drilled galleries?

Not very. :laugh

Engineers must have been at the rubbidy dub again.
by Momus
Wed Sep 30, 2020 4:51 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1804

Re: tightening head nuts sequence

Sounds like it hydrauliced.

You ought to chase the thread with a bottoming tap.
by Momus
Fri Sep 25, 2020 6:28 pm
Forum: Project bikes
Topic: Little BSS cafe racer
Replies: 57
Views: 9312

Re: Little BSS cafe racer

A little of your favourite sealant is what I suggest; but not a silicone. I use Loctite 515 or Permatex No 4 hard setting. I'm doing a B25 pump right now and surfaced the steel end plate. It had some witnesses so I surfaced it. It only took a couple of rubs and it was good. It was soft and I was sur...
by Momus
Tue Sep 22, 2020 4:52 pm
Forum: Tech
Topic: tightening head nuts sequence
Replies: 27
Views: 1804

Re: tightening head nuts sequence

The threads should be clean and dry and NOT oiled as the tightening torque will be increased due to the lowered friction caused by the oil! Tightening sequence isn't so important on a single cylinder engine as it is on a multi cylinder engine, as a general rule you just need to tighten in diagonals...
by Momus
Sat Sep 19, 2020 3:22 pm
Forum: Project bikes
Topic: Little BSS cafe racer
Replies: 57
Views: 9312

Re: Little BSS cafe racer

Use a sheet of 120 grit wet and dry paper wetted with soapy water on a flat surface to fix those pump parts. When you have a true surface put the gears in the housing and run the lot over the paper and you will get the assembly down to zero clearance. Take a bit more off the gears so you have .002" ...
by Momus
Fri Aug 28, 2020 6:18 pm
Forum: Tech
Topic: B25SS exhaust pipe
Replies: 11
Views: 1017

Re: B25SS exhaust pipe

I'd agree with Jeff K and sympathise with the purchaser.

Who ever is fabricating those pipes needs to invest in a 1/2" or more smaller center line radius tooling.

Very easy pipe to make; would be good if they were made from 409 or 304 stainless or even titanium.
by Momus
Sun Aug 23, 2020 4:56 pm
Forum: Tech
Topic: Oil leak(s) b50
Replies: 11
Views: 978

Re: Oil leak(s) b50

Any decent engine builder would be duty bound to use a sealant on those studs.

Spiral leakage is 101 stuff.
by Momus
Sun Aug 16, 2020 9:39 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1696

Re: B25SS Burning Oil

It’s just a thought, but if the the crankcase breather pipe was blocked, might this cause oil to be burnt? I hasten to add that the engine is oil tight! No need to dismantle to perform a leakdown test. You will see how long it holds compression for/rate of loss and where it is losing- ring seal, va...
by Momus
Sat Aug 15, 2020 9:37 pm
Forum: Tech
Topic: B25SS Burning Oil
Replies: 28
Views: 1696

Re: B25SS Burning Oil

Rings usually rotate so the chances of the gaps aligning is not that great. I'd take that old beast out and give it an absolute caning for a few miles. Chances are the rings will seat. Try with a different brand of oil; that has been known to help. Really needs to be pushed for a couple of dozen rot...
by Momus
Wed Aug 12, 2020 4:21 pm
Forum: Project bikes
Topic: 74 TR5 MX Project For Ken
Replies: 102
Views: 11261

Re: 74 TR5 MX Project For Ken

robtg wrote: Wed Aug 12, 2020 2:34 pm ^^^ Not the same. The original post was about motorcycle fuel tanks. Those tanks do look nice.
Tig would be the best way for them.
I make bike tanks too- all TIG welded and from 5005 not the easy soft 3003.
by Momus
Wed Aug 12, 2020 12:35 pm
Forum: Project bikes
Topic: 74 TR5 MX Project For Ken
Replies: 102
Views: 11261

Re: 74 TR5 MX Project For Ken

robtg wrote: Sun Aug 09, 2020 2:58 pm
Momus wrote: Sun Aug 09, 2020 9:56 am
Looks good, finish weld it with O/A. Better penetration and less leaks.
Opposite brother. I've made many fuel tanks; all TIG welded.

robtg wrote: Don't think so. You may want to look into how the pros do it.
by Momus
Sun Aug 09, 2020 9:56 am
Forum: Project bikes
Topic: 74 TR5 MX Project For Ken
Replies: 102
Views: 11261

Re: 74 TR5 MX Project For Ken

[/quote]Looks good, finish weld it with O/A. Better penetration and less leaks.
[/quote]

Opposite brother.
by Momus
Sun Aug 02, 2020 7:44 am
Forum: Tech
Topic: 36 Hole Front Hub Options
Replies: 17
Views: 2025

Re: 36 Hole Front Hub Options

Looking good.
by Momus
Sat Aug 01, 2020 2:28 pm
Forum: Tech
Topic: Off-throttle hanging revs
Replies: 25
Views: 2171

Re: Off-throttle hanging revs

No, it’s definitely not the carb slide sticking. I always make sure on all my bikes that the throttle twist-grip snaps back when released. New cable, good routing, clean, well-lubricated slide.... You lube your slide Cocker? With KY? :laugh That's a newy. Sometimes, and with all due care, the last ...
by Momus
Sat Aug 01, 2020 12:19 pm
Forum: Tech
Topic: Off-throttle hanging revs
Replies: 25
Views: 2171

Re: Off-throttle hanging revs

Try a stiffer carby return spring and see what happens brother <205
by Momus
Mon Jul 20, 2020 3:58 pm
Forum: Parts & Bikes wanted
Topic: Bsa mx frame project wanted
Replies: 1
Views: 1081

Re: Bsa mx frame project wanted

Location?
I have a B40 frame with period CZ forks, 18/21" in aluminium, Konis, aluminium oil tank, MX guards, B50 seat and so on.
by Momus
Sun Jul 19, 2020 7:55 am
Forum: Tech
Topic: 441 Victor resurection
Replies: 45
Views: 5114

Re: 441 Victor resurection

Well, I got my next surprise. Whilst pulling off the primary cover to clean up the clutch plates I discovered that the footrest bracket needed to be removed. I did not use all that much torque, but it stripped the threads on the foot rest stud. They were likely already stripped. No biggie I had 2 s...
by Momus
Thu Jul 16, 2020 10:20 am
Forum: Tech
Topic: Electronic box mounts
Replies: 4
Views: 1039

Re: Electronic box mounts

We used 4 of those to mount Brute 330cc Two stroke twins in Jet Ski hulls. About 80 duro.

Embletons in Baker's Rd could supply them.
Very heavy duty for electricz🤔
by Momus
Thu Jul 16, 2020 6:49 am
Forum: Tech
Topic: Kick start spring B50
Replies: 6
Views: 932

Re: Kick start spring B50

Another part designed by the cleaner when the eng. was at the rubbidy dub.

A springmaker with a CNC coiler will duplicate the std spring in heavier wire no problems.

I use Bells in Thomastown or National Springworks in Campbellfield.
by Momus
Wed Jul 15, 2020 3:19 pm
Forum: Parts & Bikes wanted
Topic: WANTED C15 B40 Distributor
Replies: 8
Views: 1421

Re: WANTED C15 B40 Distributor

OIP.jpg
OIP.jpg (8.82 KiB) Viewed 985 times
by Momus
Mon Jul 13, 2020 3:26 pm
Forum: Parts for sale
Topic: B50MX Square Style RH Side Panel 150 AUD
Replies: 0
Views: 889

B50MX Square Style RH Side Panel 150 AUD

SAM_0743.JPG
SAM_0742.JPG
New, never fitted.

It is what I understand is the USA market item.

It's in Australia and I'll send it anywhere.

Please message me here or email :

Edit by mm: Email removed to protect from spam, please use pm system.
by Momus
Sun Jul 12, 2020 3:03 pm
Forum: Tech
Topic: B25SS Rocker Box Studs
Replies: 10
Views: 1290

Re: B25SS Rocker Box Studs

If it was my bike I would remove the studs, run a flat file over the rocker cover surface, then helicoil all the stud holes with a suitable thread form (I used m6 on my B44) and replace with socket caps. The two bolts holding the head steady are probably strong enough and can be left alone. But its...