5 speed Enfield

[taildraggin]

I picked up a Sixty-5 Enfield Saturday and I'm putting the Yanmar back together. The 65 has elec. start and a 5 speed gearbox. Has anyone built an Enfield with a 5 speed?

The problem may be the electric start primary covers. It may all work, using a RH shift kit, if the 4 speed's primary covers fit the 5 speed gearbox.

- Charlie

[Diesel Dave]

Charlie,

I have used a 5 speeder for many years with the Greaves/Lombardini engines.

Firstly you need to establish if you need a longer input shaft for the clutch to line up with the motor sprocket - if so then it's gearbox apart time. Be warned that the longer 5 speed shafts are made by cutting and welding in a section and as a result ar not particulary straight.

You can use either left or right foot shift - take a look at the cover and you will see an unmachined boss where the lever shaft can exit from. You can also swap the change plate to provide 1 up 4 down rather than the usual 1 down 4 up shift pattern.

You need to be aware that the 5 speeder RH casing extends further forward than the 4 speeder and this is why it can't be fitted with the Hatz IB40 motor as it clashes with the flywheel and cover.

To use the original primary cover you just need to drill out some holes for the shaft to pass through and fit oil seals to them - if you take a look at the 65 you will see the shaft actually passes through the engine oil tank with additional seals here too - a risky prospect if ever I saw one.

If you are used to the 4 speeder then the 5 will seem like a revelation as it changes gear easily and you can even select neutral at a standstill and have a little freen light to confirm things too.

Dave

[taildraggin]

Thanks Dave. I don't mind the 4 speed, but it seems that the 5 is just a better box - it's also what I have in the garage.

I've eyeballed the primary cover and shifter configuration of the 5 speed (with appropriate sucking of teeth and wincing). The motor really is a "5 spd motor" with that shifter shaft coming through it.

I doubt that the plane of the 5 spd clutch basket relative to the engine sprocket is any different than the 4 spd version, so I assume that a longer shaft will be necessary. (I'm also assuming the that extended 4 spd shaft made for the Greeves will not fit the 5 speed.)

It's tough that the RH 5spd kit will not fit the Yanmar; it turns the issue to the 5 spd's LH shifter shaft:

- does the position of the LH shifter shaft interfere with the position of the Yanmar?
- the LH shifter shaft needs to be extended, too.

If the LH shifting shaft will allow the fitting of the Yanmar, the best way may be to position the engine off center to line up with the original position of the primary, as Heiko did on his bike shown on Altmann's site.

[Diesel Dave]

It's not really about the shifter shaft itself - more of the casing it sprouts from pokes forward a lot

Compare



See how close the flywheel casing is to the gearbox outer casing.

Compare this with the 5 speeder:



Sorry but it's the best photo I could find
It's the bit that juts forward that's the problem - look carefully at where the shaft comes out from the gearbox casing.

Dave

[taildraggin]

I see - it's not a RH/LH issue. That looks very tight on the right.

It looks like a Greeves in the lower shot. I guess the first question is whether the Yanmar can get that cozy with the 5 spd, at all.

I looks like the shifter on the lower pic lines up with the footpeg.

I've found a 5 spd kick start inner primary and will have to mock up the configuration to see.

Thanks for the pics.

[Stuart]

Here's a closer shot of Daves bike.

[taildraggin]

Eyeballed it last night and it's going to be close with the yamnar. There is more stuff hanging off the backside of it than the Greeves, I fear.

(I didn't realize that the LH shifter is the same shaft as the RH - it just runs out the back of the RH cover (above) and straight through the engine and primary. Lovely design. )

The diesel is down to the case, so it doesn't line up too accurately right now. The parts should arrive soon and then the chances of bundling them together on the bench with the primary will become evident. Have all the guv parts back there, too.

Thanks for the detail picture. I like that little glass filter/separator.

- Charlie

[Diesel Dave]

If you look carefully you can see the whacking big dent in the fan housing to clear the gearbox!

[taildraggin]

As long as the flywheel doesn't ting against the shroud, you're A-OK.

Just eyeballing: the RE sprocket centers measured 9" between the crank and gearbox shaft.

It looks like the yanmar runs ~7 1/4" from the crank center to the back case.

That's about 23 and 18.5 deciliters (or is it centijoules?), metric.

[shmopieo]

Hi there.
Im currently undertaking the conversion of a sixtyfive, with the five speed box. Just wondering if you used the Taurus extended shaft. I was told it would not fit. What other parts were needed for the conversion? Did you use a suport at the chaincase? What size oilseals did you use? What about sub frame engine mount? Any build plans for a subframe? Im currently in Italy, and can have pretty much anything fabricated to spec for cheap.
Any help or advice would be great.

[Diesel Dave]

You can't use the Taurus 4 speed shaft in a 5 speed box - it's different in spline/length/diameter etc etc.

Dave