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Light Twins

Description

A technical forum for Jubilee, Navigator and Electra

Engine sprocket

Submitted by mathew_humphrey on Sun, 29/11/2020
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Hi all, this is a plea for advice. I'm trying to change the primary chain on my Navigator, but I'm completely stuck with removing the engine sprocket from the crankshaft. I've left it under as much tension as I dare, (using the puller that the OC sell, as picture) but despite several goes with a (small) blowtorch, and blows with a copper block and hammer it seems nowhere near breaking its hold on the taper. I've followed procedures I've read from earlier disussions of this on here - I just wondered if there's anything else to try, or is it just 'more heat and more force?'.

Navigator/Electra cylinders

Submitted by john_crocker on Fri, 27/11/2020
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Do Navigators and Electras share the same cylinder casting?  That is to say is an Electra barrel just an over bored Navigator casting?

I believe Electras did not have the spigots to locate the heads, this modification migrated to Navigators and Jubilees eventually.

Are there any differences between crank cases because of the larger bore?

I understand that the Electra flywheel part of the crank case is narrower, presumably to clear the larger pistons and/or the cylinders.

Grubby business ahead

Submitted by michael_coare on Tue, 24/11/2020
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Help! Just discovered another problem with the Electra bits. The rocker oilways in the cylinder heads are blanked off with tiny grubscrews (#20873); one is missing completely- I can insert a probe right to the bottom, a good inch or more.

Of course not listed in the NOC shop or on Norvil. Any ideas what the actual size is?

Anybody ever successfully removed one? Heat head up in the oven first? I have a spare head that I could strip.

navigator re bore limits and nos shop soiled ?

Submitted by richard_maydwell on Tue, 24/11/2020
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hi guys , looking at getting some pistons sorted when my budget allows me after xmas , my current 350 barrels are 40thou over standard and need a re bore. Looking at the barrels there isn't a lot of meat on them so i am assuming that plus 40 thou is the limit? also looking at pistons on the non spares page there isn't any at that size anyway so looks like a re sleeve is probably the best road to go down. 

Gearbox games No.1

Submitted by michael_coare on Tue, 24/11/2020
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Among my boxes of supposedly Electra bits, I have 2 different layshafts as follows:-

A: Length 6 1/8”; scrolls both ends; no lube hole; drilled entire length; end spline 1 1/8”

B: Length 5 7/8”; no scrolling; single lube hole; drilled one end to  1 ¾” ie to lube hole; end spline 7/8”

Nut types Jubilee

Submitted by john_dunn1 on Sun, 22/11/2020
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Are the nut types are used on the engine studs just full nuts or was there a mixture nuts fitted. On one end of the studs I have nyloc nuts and other end full nuts. Should they just be full nuts.

Thanks

John.

350 Jubilee

Submitted by dan_field on Sat, 14/11/2020
Forums
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There’s an interesting jubilee in the forthcoming national motorcycle museum auction, it says it is 350, but has a 17 engine number and the headsteady seems to fit?

So i assume it has 350 barrels and Navigator down tube or the listing is wrong! 

Dan

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