1969 GT tacho drive

[martymoose]

I think the drive should have thrust washers top and bottom, anybody know the thickness? This one is missing the washers. Alternatively what end float should I aim for. Thanks. Marty

 

[martymoose]

Oh and while I'm here, I was about to put B9ES plugs in the GT same as I use in my SF2, but looking at the old plugs, they are 7's. Which is correct? Thanks.

 

[Ernesto]

Near miss.
BP 8 ES for both.

 

[Paul Marx]

Yes, 8. Depends on the fuel you have but my SFC is fouling 9s now and needs 8s. It used to be fine with 9s. Same story on the S.
7s might be a bit risky but it would depend on the riding you do. I should think they'd be fine for pottering about.
Paul

 

[sfcpiet]

Yes, HARDENED thrust washers either side, Marty. About a mm each, but thickness is not too important, as long as the gear has a little axial clearance and is free to turn easily. Main thing is that the gear doesn't bear on the alloy or brass bits directly.

piet

 

[martymoose]

Thanks guys, this GT is a journey, someone named Errol has been here, everything he touched he f...ked

 

[piranha-bro2]

Thanks guys, this GT is a journey, someone named Errol has been here, everything he touched he f...ked

Imagine buying a bike like that Marty - I couldn't live with it until I'd stripped it of every nut and bolt and built it up from scratch.
BTW the SFQ is running 9s. Lots of idling while I check Ignitech settings and not prob with fouling. I'll only go to 8s if it's absolutely nec but running a 5/C, open pipes and over 10:1 CR I'd be worried when caning it.

 

[martymoose]

Big differences between the GT and an SF2, valves, carbs, compression ratios, if it was my bike it would get a full strip down. Ill run wih 8's, see what i get.

 

[Dellortoman]

Are you taking the piss about the name Errol Marty? As in Errol Flynn, shags everything that moves. Or is it a real name?
Reason I ask is that I have a bloke in ACT helping me sort a problem with my Benelli dashboard. His name is Errol.

 

[Vince]

Mmm, suttle.

 

[martymoose]

I'm not known for my subtlety Cam....

 

[Tippie]

Thanks guys, this GT is a journey, someone named Errol has been here, everything he touched he f...ked

Or he took the advice Piet had on his motto: If it isn't fucked, keep on fixing it until it is.

 

[Vince]

Sounds like my Atlas, I am fixing it too with an inch of its life.

 

[martymoose]

Have sourced 2 second hand genuine (I think) thrust washers. Interestingly they are not flat, witness mark on the inside on the hilly side, outside on the valley side. Who knew this could be so complicated..... I am thinking of going with the hill side to the drive shaft. Thoughts?

 

[Exmoor beast]

Have sourced 2 second hand genuine (I think) thrust washers. Interestingly they are not flat, witness mark on the inside on the hilly side, outside on the valley side. Who knew this could be so complicated..... I am thinking of going with the hill side to the drive shaft. Thoughts?

That makes sense, less contact area and smaller rolling diameter on rotating shaft. It’s oil fed and running a half engine speed so will be fine.