BritBike Forum

Home, Sponsors
Newsletter, Regalia
Calendar, Bike Project
BritBike Museum
Spiders Cartoons
"OLD" BritBike Forum

DVD- Manuals & Parts books
BritBike Stickers & Decals
Upgrade to:
Premium Membership Premium Life Membership
Vendor Membership Site Sponsor Membership

Photo posting tutorial

Sponsors campaign ads..
BritBike Sponsor
BritBike Sponsor
BritBike Sponsor
BritBike Sponsor
Shout Box

Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Member Spotlight
Member Since: 05/30/06
Posts: 76
Who's Online
54 registered (Tridentman, peter paul, franko, L.A.B., Dick Harris, tiumphdave, Tadbrenner, KennethC., rw513, kommando, Tasman, Transgarp, Sam, oilyamerican, Dave T, Ob1quixote, Matt in Houston, Jake, TR6Ray, Kent Shaun, KevRasen, dommie90, Richrd, lemans, bsa_junkman, AngloBike, Blown Income, henryanthony, Randy Pigford, keith bradley, desco, beara58, Jeff K., Don Leaming, koncretekid, bill50cal, ChrisX, Rickman, eezeetoo, David in Atlanta, Johnvr, Triless, Shane in Oz, Rich B, mblab, Hillbilly bike, Hank, Red Lapierre, TT Rider, SBell, Alan_nc, stubbicatt, machico, Ger B), 409 Guests and 99 Spiders online.
Key: Admin, Global Mod, Mod
Newest Members
Repo7376, GS John, motobilly, mark grinnall, Hoon
8486 Registered Users
Top Posters (30 Days)
Zombie 224
Lannis 136
KC in S.B. 116
kommando 103
wadeschields 102
Ger B 83
ricochetrider 83
Boomer 81
Stuart 77
kevin 75
Forum Stats
8,486 Registered Members
33 Forums
56,476 Topics
529,182 Posts

Most users ever online: 1,804 @ 03/01/11 6:54 pm
Manuals on DVD (Free shipping)
BritBike.com Decals & Stickers (Free shipping)
BritBike.com decals & stickers
Topic Options
Rate This Topic
#266191 - 07/22/09 4:36 am B33 Tappet Clearance problem
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2796
Loc: arkansas
I just can't get my .003, especially on the exhaust. Tried to follow the drill in the manual, but the adjusters just won't thread down far enough. Thats with engine cold, didn't think to check with engine warm. Engine running pretty well with bike on my bench, but maybe I better not do test ride till I figure this out.

Are these like an old Ford tractor, you take a file to something? Can you get the tappet/adjuster clear apart and do something to gain some room? Thanks for any ideas.

Top
Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
#266206 - 07/22/09 9:12 am Re: B33 Tappet Clearance problem [Re: leon bee]
BSA_WM20 Offline
BritBike Forum member

Registered: 05/05/04
Posts: 2916
Loc: Sydney Australia
Usual suspect for a sudden change in the valve lash is the guides shifting.
Double if they have been replaced.
Next is incorrect length of valve.
Then is worn seat / baddly replaced seat .
Followed by worn out guides.

Now the number you quote seems a tad tight.
Without checking I think that you should be looking at .006" & .008" or there abouts.
_________________________
Bike Beesa
Trevor

Top
#266231 - 07/22/09 1:51 pm Re: B33 Tappet Clearance problem [Re: BSA_WM20]
Alex Offline

BritBike Forum member

Registered: 09/05/02
Posts: 7751
Loc: NorCal
Leon, did you end up putting a gasket in the fire ring? The thickness of that gasket will change your clearances. You can make up for it by putting lash caps on the valves or lengthening your pushrods. The latter would be the correct thing for maintaining rocker geometry, but hell, it's a B33 slogger.
_________________________
A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.

Top
#266237 - 07/22/09 2:48 pm Re: B33 Tappet Clearance problem [Re: Alex]
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2796
Loc: arkansas
Trevor: My book says .003. This is a long dormant engine I am getting going- history unknown.

Alex: For now, I just cleaned head joint and used some coppercoat. Seems to be holding okay. When cleaning the head, I found some mashed copper wire under the crud. So my problem is a little less clearance than I had before.....and that was barely .003 with adjusters all the way down. I guess I better pull the adjusters apart.

Top
#266286 - 07/22/09 7:11 pm Re: B33 Tappet Clearance problem [Re: leon bee]
beezageezauk Offline
BritBike Forum member

Registered: 04/23/02
Posts: 924
Loc: North East England
Leon, I've been running a B31 since 1974 and both the inlet and exhaust tappet clearances are set at .003 on a cold engine. B33's use the same settings so your book is correct.
Beezageezauk.

Top
#266338 - 07/23/09 3:20 am Re: B33 Tappet Clearance problem [Re: beezageezauk]
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2796
Loc: arkansas
Okay, looks like I'm gonna have to take a grinder to something.

Top
#266351 - 07/23/09 7:24 am Re: B33 Tappet Clearance problem [Re: Ray in Sunny CA]
joe a. Offline
BritBike Forum member

Registered: 10/14/02
Posts: 530
Loc: minnesota
leon....so you never said what the clearance is now.002 -.001?? the cyl grows and clearances increase so .002 would be ok....if you want to see check it when it is hot you should have clearance, just see if the tappet spins and make sure there are no tight spots as there may be a slight bend ...........the head/cyl are lapped in for correct sealing(and possibly some aluminum or coppercoat sealer used).maybe someone changed the sleeve, machined the flange, cases etc and the dims changed...joe@vcycle

Top
#266371 - 07/23/09 12:15 pm Re: B33 Tappet Clearance problem [Re: joe a.]
leon bee Offline
BritBike Forum member

Registered: 12/14/02
Posts: 2796
Loc: arkansas
Okay, I was kinda bluffing on the grinder. That tappet clearance is about the only thing keeping me from a test ride. Well..........that and the leaky 289 carb catching fire when she backfires.

Top
#266379 - 07/23/09 1:15 pm Re: B33 Tappet Clearance problem [Re: leon bee]
Alex Offline

BritBike Forum member

Registered: 09/05/02
Posts: 7751
Loc: NorCal
289 carb leaky? Surely you jest!

Anyway, if you've got any clearance at all, take it for a spin...if not, you gotta fix it because you'll burn a valve. BTW, a copper head gasket or a cylinder base shim will cure it if you can't find another way.
_________________________
A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.

Top

Moderator:  Mike Carter 


BritBike Forum

Home, Sponsors
Newsletter, Regalia
Calendar, Bike Project
BritBike Museum
Spiders Cartoons
"OLD" BritBike Forum

DVD- Manuals & Parts books
BritBike Stickers & Decals
Upgrade to:
Premium Membership Premium Life Membership
Vendor Membership Site Sponsor Membership