Starter Motor swap

The suffix in those photos matters. Others have tried this style of starter and found that it doesn't engage properly with the ring gear. The problem is that the pinion throw isn't always right. Lotusbits have done a deal with WOSP to get a "perfect" throw, hence the LB suffix.

So - to work. First, disconnect the battery lead in the boot. If you don't do that, you're going to get fireworks later.

Then remove the air filter housing, filter and air box (8 nuts holding the trumpets to the carbs + a couple of pipes and a throttle return spring). You should see something like the image below.

Now, to remove the motor.

M10 x 80mm is the spec. for the M80R, a 3M100 will have M10x65mm. Whichever you have, a 17mm spanner on the bellhousing side is essential.

You'll have to do it by feel unless your eyes are on stalks.

Withdraw the motor and put it to one side.

And finally, motor in place. The cables need a little bit of rerouting so it's worth getting them onto the post and holding them in place with the nut finger tight on the stud until the motor bolts are fully tightened. Don't forget to put the rubber boot onto the cable before clamping it onto the motor. The extra insulation will be useful if you're working in that area in the future.