Bike of the month December 2016

 

bike-of-the-month-december-2016Less is more, more or less…

There can’t be too many occasions when its perfectly acceptable to replace the mighty heart of an EFE with something….erm…well, a bit less EFE-ish

The EFE is a legend in OSS  folklore and a brute in stature, from the humongously sized (and priced) headlamp, its no nonsense alpha bodywork  and its squared off arse. You don’t mistake an EFE for anything else or indeed anything less…

or do you?…say without its monstrous 16valve atlas stone?

5840abb7906fb_duckmotor-jpg-fcc6d722602ed8fcdc929e9237444e67

An idiom wriggling inside a can that’s rattling inside Pandora’s box, a Russian doll painted as a biker…. we could , or more accurately, those follically endowed, could split hairs and possibly a pint over such a premise… I guess it’d be prevalent to ask someone so old-kool and oldskool they probably had a highway hi-fi phonograph in their race van…

I guess one reason could be when N/A is not enough….I’d  be well happy to have such a beast of a conundrum.

Congratulations Clive AKA Duckndive, you’re bike of the month.

Read Clive’s build thread here

Intake & Exhaust Port Surface Finish

As long as the intake port surface finish is fine enough so that the highest protrusions are not above the air /fuel mixture boundary layer thickness, then improvements on the finish will have little effect on air / fuel mixture flow . A rougher finish is actually an advantage. Do not over polish an intake port because of its wet fuel flow capability.

A polished exhaust port will increase the exhaust gas flow and will reduce the potential for carbon to build up on the exhaust port surface.

In conclusion 97% of a performance gain from porting a cylinder head is from the shape of the ports and only 3% is from a polished finish.

How-to fitting 3.5 GSXR front wheel into EF front end

Capitan Chaos site moderator, motorcycle mechanic and EFE addict shares some useful info on upgrading the front wheel on your EFE.

Here’s how:

– remove the bearings from the EFE front wheel, and take the tube which is in between them. Do the same with the GSX-R one.
– you will find out the EFE one is 16mm longer than the GSX-R one. It needs shortening 16mm.
– buy some bearings which fit in the GSX-R wheel and on the EFE spindle. I don’t remember exactly the sizes, but you need bearings with the ID of the EFE ones, and the OD and width of the GSX-R ones. They were off the shelf in the local bearings shop.
– the tubes in the bottoms of the EFE forks are now too short. Make some new ones which are 8mm (each) longer.
– the EFE speedo drive will fit after a little bit of material has been removed. Offer it up on the GSX-R wheel and you’ll see exactly where.

And now, with that nice 3-spoke wheel, it would be a shame not to upgrade the brakes as well.
The Slingshot Nissin 4-pots, and the later GSX-R models’ Tokico 4- and 6-pots all fit on the EFE forks, 90mm spacing between the bolts. But the Slingshot discs are too large.
Now Suzuki had thought about this and launched the GSX600F in the late eighties, this bike has brake discs that fit perfectly on the GSX-R wheel and are small enough to accept the more modern calipers when mounted in the EFE forks. All it needs is some small rings to space out the calipers a bit towards eachother.
Use the EFE caliper mounting bolts, they are longer than the GSX-R ones.

Captain Chaos

Discuss here