Any Ideas

tstewart
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 160
Joined: Sat Dec 12, 2015 3:06 pm
Location: Aberdeenshire
Contact:

Any Ideas

Postby tstewart » Mon Feb 25, 2019 6:32 pm

I have screwed up or been screwed up, I got a set of reconditioned cranks have built the engine installed in bike and today went to install the points. Found 2 off cams to fit onto the crank (only need 1). Dragonfly pointed out I needed this but it is not on the parts list. Found two in the last of the parts I got in the box as the bike was a basket case. The keyway has been removed at some point on the refurbished crank, not something I have done.. So the cam does not lock on. I can see where the keyway was.

Any suggestions how I can over come this problem? Or does it need new cranks.

john.whiting
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 1321
Joined: Sun May 22, 2011 2:10 pm
Location: Brisbane QLD
Contact:

Re: Any Ideas

Postby john.whiting » Tue Feb 26, 2019 1:42 am

Do you mean that the end of the drive side main has been cut off.......or just the keyway is filled?.......even if the shaft is cut ,it can be repaired ,as the points take no load.

tstewart
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 160
Joined: Sat Dec 12, 2015 3:06 pm
Location: Aberdeenshire
Contact:

Re: Any Ideas

Postby tstewart » Tue Feb 26, 2019 7:59 am

John it looks like the metal on the crank has been ground off.

lawriewhite
Posts: 41
Joined: Fri Oct 12, 2018 1:30 pm
Location: South Yorkshire
Contact:

Re: Any Ideas

Postby lawriewhite » Tue Feb 26, 2019 8:01 am

Are both cams the same? By that I mean both have keyways, lobes in same position? If so, then for some reason you got 2 cams!!
How can you see where the keyway was? Has it been 'welded' & re-machined, if so, it can be ( very carefully ) centre-popped & drilled to take a small pin, & as said previously, no real load & more than enough to locate the cam.
Or, could it simply be a sheared key that's still in the slot & been 'smoothed' flush?
Either way, I'd have a go at drilling & re-pinning. An easy job, even in situ.

User avatar
simon.holyfield
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 3435
Joined: Mon Oct 17, 2011 11:16 pm
Location: Norfolk
Contact:

Re: Any Ideas

Postby simon.holyfield » Tue Feb 26, 2019 1:22 pm

tstewart wrote:John it looks like the metal on the crank has been ground off.


Could you take a close up picture?
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
http://ariel-square-four.blogspot.com

tstewart
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 160
Joined: Sat Dec 12, 2015 3:06 pm
Location: Aberdeenshire
Contact:

Re: Any Ideas

Postby tstewart » Tue Feb 26, 2019 5:49 pm

My photography skills are almost zero, but here is a photo.

The keyway would have been at 9 o clock in the photo.

Been looking in the manual to see if there is a figure for below TDC and might go for electronic ignition as there would be less friction.
Cannot see the figure.

Hope the photo explains what is going on.

The 2 cam thing is because I bought the bike in bits and there was 2 of somethings.
Attachments
IMG_0921.JPG
IMG_0919.JPG

User avatar
simon.holyfield
Holder of a Golden Anorak
Holder of a Golden Anorak
Posts: 3435
Joined: Mon Oct 17, 2011 11:16 pm
Location: Norfolk
Contact:

Re: Any Ideas

Postby simon.holyfield » Tue Feb 26, 2019 6:01 pm

I think I'd drill that for a dowel or a roll pin, in situ.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
http://ariel-square-four.blogspot.com

tstewart
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 160
Joined: Sat Dec 12, 2015 3:06 pm
Location: Aberdeenshire
Contact:

Re: Any Ideas

Postby tstewart » Tue Feb 26, 2019 6:12 pm

Andy I had never thought about that, good idea. I will investigate that thanks.

User avatar
AndyEames
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 103
Joined: Sun Sep 10, 2017 4:20 pm
Location: Derby
Contact:

Re: Any Ideas

Postby AndyEames » Tue Feb 26, 2019 7:25 pm

Try screwing the cam on to the end of the crank keeping the cutout on the cam lined up with whats left of the 'pip'. When the screw starts to get tight, check the alignment again and if ok,lightly tap the end end of the cam. No lump hammers !.Then tighten the screw home fully. As previously stated ,its the taper that holds it, the pip is only for timing.

tstewart
Holder of a Nylon Anorak
Holder of a Nylon Anorak
Posts: 160
Joined: Sat Dec 12, 2015 3:06 pm
Location: Aberdeenshire
Contact:

Re: Any Ideas

Postby tstewart » Tue Feb 26, 2019 8:05 pm

Andy the pip is actually flat, but I suppose I could line the cam up with mark.


Return to “Two stroke”

Who is online

Users browsing this forum: No registered users and 2 guests