A A A
Avatar

Please consider registering
Guest

Search

— Forum Scope —






— Match —





— Forum Options —





Minimum search word length is 3 characters - maximum search word length is 84 characters

Register Lost password?
sp_Feed sp_PrintTopic sp_TopicIcon
Ibayorkie's D1
Avatar
cocorico
Central France
Moderator
Moderator
Forum Posts: 2624
Member Since:
June 23, 2013
sp_UserOfflineSmall Offline
101
August 7, 2018 - 10:18 am
sp_Permalink sp_Print

The inner side id of the cam is slightly smaller than that of the outer. The fixing screw (normally a cheese head) sits inside the outer face of the cam with a small spring washer under it.

When replacing the cam, I find it easier if I hold the woodruff just key proud using a suitable drift (instrument screwdriver, etc) or often the cam just pushes the key down into the shaft. Put the cam over the drift first, then introduce them at the same time. Lookout for the tiny key jumping out!

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
102
August 7, 2018 - 5:45 pm
sp_Permalink sp_Print

Thanks for the tip.

No spring washer and the screw/bolt isn't a cheese head. I there a recommended dealer who can supply these parts?

 

Alan

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
103
August 7, 2018 - 5:59 pm
sp_Permalink sp_Print

Sorry, its just dawned on me that the bolt/washer/cam are actually engine parts, not ignition parts so I might be able to get them from one of the usual parts suppliers, Draganfly, Bournemouth Bantams etc.

Avatar
sunny
Norfolk
Forum User
Club Member
Forum Posts: 1081
Member Since:
January 9, 2013
sp_UserOfflineSmall Offline
104
August 7, 2018 - 7:42 pm
sp_Permalink sp_Print

hi    chaps  i  had  some   cut  last    week  so  if  you  get  stuk   let  me  know

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
105
August 7, 2018 - 9:33 pm
sp_Permalink sp_Print

Thanks for the offer. I will have a fiddle over next couple of weeks and let you know. Im not sure if I will need the cam, probably just the screw, flat washer and locking washer. Do you have these? Alan

Avatar
sunny
Norfolk
Forum User
Club Member
Forum Posts: 1081
Member Since:
January 9, 2013
sp_UserOfflineSmall Offline
106
August 8, 2018 - 7:39 am
sp_Permalink sp_Print

yes   Alan  scew  flat & lock  washer        but  only   4   flat     washers      cut   for  me       

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
107
August 8, 2018 - 8:57 pm
sp_Permalink sp_Print

Thanks. Sent you a PM. Alan

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
108
September 16, 2018 - 10:25 am
sp_Permalink sp_Print

Used my new digital vernier for first time yeaterday. Surprised to find reading for rear spindle was .40 inch/11mm. I believe this is 7/16 when converted. I was expecting 1/2 inch.

Strange.

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
109
February 10, 2019 - 1:28 pm
sp_Permalink sp_Print

Sorted out points cam today and it now seems to run fine. Thanks to all who assisted me in resolving this.

But its not all good news. I have an oil leak from top of crankcase, I can see it bubbling when the engine is running. I dont know how serious this is but hopefully someone will tell me it isnt!

I assume its gearbox oil, so wont affect the running of the engine so all I need to do is keep topping up the gearbox- correct?

If it can be run like this, but is it fixable?

Really hope it isnt serious, I need to get it on the road this year, almost 18 months since I got go and its been one thing after another wrong since then!

 

Alan

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
110
February 10, 2019 - 1:33 pm
sp_Permalink sp_Print

Heres n image relevant to to my last post.

Alan

Avatar
cocorico
Central France
Moderator
Moderator
Forum Posts: 2624
Member Since:
June 23, 2013
sp_UserOfflineSmall Offline
111
February 10, 2019 - 1:39 pm
sp_Permalink sp_Print

I doubt it's gearbox if it's coming from the top - the gearbox should be neither full, nor pressurised, so no oil from it should be up there! Maybe, if it's around the cylinder base, you have a blow from the base gasket, if not I would suspect a damaged joint in the crankcase halves, forward of the g/box area.

Perhaps a pic of the leak when the bike is running would help?

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
112
February 10, 2019 - 1:41 pm
sp_Permalink sp_Print

The image I provided was taken with the engine running. Its very clean oil which made me suspect the gearbox. Where else could clean oil be coming from?

Avatar
Blue Heeler
Forum User
Site Member
Forum Posts: 2094
Member Since:
November 16, 2011
sp_UserOfflineSmall Offline
113
February 10, 2019 - 1:44 pm
sp_Permalink sp_Print

Nothing to worry about Alan, if it`s only that one area of crankcase sealing faulty,ie top of gearbox. You can wipe with thinners-soaked rag and work some petrol-resistant sealant into the join. Soak thinners rag in water before binning(self combustion safety issue).

Carb flooding(tickler) can be to blame.

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
114
February 10, 2019 - 2:52 pm
sp_Permalink sp_Print

Thanks for the reassurance. 

I think it must be gearbox oil, just why its coming out of the top of the crankcase I have no idea. All I can think is theres too much oil in there.

When you mention carb tickler do you mean dripping fuel could have dissolved the original sealant?

Is there a fuel resistant sealant you to recommend please?

 

Alan

Avatar
Blue Heeler
Forum User
Site Member
Forum Posts: 2094
Member Since:
November 16, 2011
sp_UserOfflineSmall Offline
115
February 10, 2019 - 3:44 pm
sp_Permalink sp_Print

Seeing you`ve had it running, we`ll put "gearbox pressurisation due to leaking crankcase from the flywheel area", on the back-burner, and assume it`s just centrifugal force flinging oil off the gears and some`s finding its way through a gap at the top of the crankcases.

Yes petrol is a solvent and will attack certain sealants. I chop and change between sealants, some silicone ones are not petrol resistant, but a good one will hopefully do the job...it should state fuel-resistant on the tube.I`ll check the tubes I have later today and get back to you. I knew a top IOM TT engine tuner(Robin Church) from the 2-stroke era, he did some carb mods for a road bike for me, he went through a port into a water jacket and he repaired it with Araldite! Modified 350LC clocked at 160mph, the Araldite held well against water pressure and fuel.

Worth checking your gearbox oil level and also have a sniff of it to see if any petroil mix has found its way through the join between engine and gearbox to dilute the oil. Probably unlikely because by the same token, the engine could be drawing in gearbox oil and burning it via such a badly sealing joint....but I`ve seen some odd things with Bantams, so anything is possible.

Avatar
Piquet
West Norfolk
Admin
Forum Posts: 2232
Member Since:
September 3, 2012
sp_UserOfflineSmall Offline
116
February 10, 2019 - 3:53 pm
sp_Permalink sp_Print

You may find a clue in the colour of the oil.

I have a similar problem with one of mine, clean oil bubbles out from the crankcase joint just behind the barrel. In my case I know its from the petroil mixture as it is coloured red. The bike doesn't want to rev up properly so I am assuming there is a problem there that may be causing it. I won't know for sure until I strip it.

I'm not a complete idiot ............................................ some parts are missing.

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
117
February 10, 2019 - 5:41 pm
sp_Permalink sp_Print

Why would the oil turn red when mixed with the petrol, are you using a red coloured 2 stroke oil?

Oil seemed pretty viscous so not obviously mixed. 

Exhaust didn't seem too smokey but not sure I would be able to tell the difference. Cetainly not pushing out clouds of smoke and didn't smell oily.

 

Alan

Avatar
Piquet
West Norfolk
Admin
Forum Posts: 2232
Member Since:
September 3, 2012
sp_UserOfflineSmall Offline
118
February 10, 2019 - 5:57 pm
sp_Permalink sp_Print

Most self mixing two stroke oil is coloured, mine happens to be red, and although it is mixed with petrol in the tank, some of it separates out during use in the engine, otherwise it couldn't do it's job.

When you strip a Bantam engine that has been running on a proper petroil mixture, you will find that the crank, bearings, flywheels and the crankcase interior should all be coated in oil.

I'm not a complete idiot ............................................ some parts are missing.

Avatar
lbayorkie
Otley, West Yorkshire
Forum User
Club Member
Forum Posts: 194
Member Since:
December 6, 2016
sp_UserOfflineSmall Offline
119
February 10, 2019 - 6:14 pm
sp_Permalink sp_Print

Thanks Piquet.  Yes all part of the 2 stroke process. Alan

Avatar
BSAdave
London
Forum User
Club Member
Forum Posts: 1402
Member Since:
July 25, 2014
sp_UserOfflineSmall Offline
120
February 12, 2019 - 11:04 am
sp_Permalink sp_Print

one of mine gets oil coming out of the breather hole in the dip stick.

I could agree with you, but then we would both be wrong

Forum Timezone: Europe/London

Most Users Ever Online: 98

Currently Online: ZZ, swalsh58, bantammad
13 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

Cornish Rooster: 3303

Anderzander: 3208

bart: 3128

Sprung Chicken: 2650

David Dale: 2491

Mags 1: 2301

Munchkin: 2219

Katj: 2139

Blue Heeler: 2093

HowD1: 1942

Newest Members:

Mark Norris

Forum Stats:

Groups: 9

Forums: 46

Topics: 11488

Posts: 98735

 

Member Stats:

Guest Posters: 510

Members: 2623

Moderators: 2

Admins: 3

Administrators: Piquet, JMD, Rusty Floater

Moderators: cocorico, xcgb