This topic has occupied most of my spare brain-time for the past few months:
- what size/type jerrycans?
- where to mount them?
Fuchur, IMHO the problem with set-up in the photo you posted is that when (!) the bike falls over, the cans will ram into the tank or engine. Also, I am reliably informaed that you need a light front for sand and mud - this set-up looks like it doesn't offer the flexibility to move the jerrys to the rear of the bike.
I am just about to start welding up engine guards and a tank guard for my 3AJ. I will use these to mount a 10lt jerry on each side (or perhaps 3 x 5lt on each side - undecided as yet).
I think these are a good idea regardless of whether or not you plan to mount anything to them. They can save your engine casings from sharp rocks, and your legs from nasty burns (I had an impression of three studs and a mirror-image of the words 'oil filter' burnt on my right leg after a low-speed fall in deep sand on my XT250).
I will post a drawing, however the general idea is to cut out a piece of plate steel to the shape of the flat sides of the lower engine bracket (the thing at the end of the frame down-tube that has two bolts attaching to the frame, and another two to the engine). This plate is bolted on using slightly longer versions of the existing four bolts. Using 20mm round section tubing, I'm going to weld a sideways 'U' onto the plate, with the top spar in between the top two bolts, and the bottom spar about an inch or so below the existing level of the engine bracket. This structure will be braced with a diagonal spar. The rounded end of the sideways 'U' will be approx 3 inches wider than the tank.
IMHO the problem with many of the engine guards I have seen is that they have no structural support to prevent them being flattened against the engine or pushed backwards. Imagine falling at running pace - most engine guards I have seen look like they would simply bend toward the back of the bike or against the engine. Therefore, the sideways 'U' will include a further piece of tubing running from the rounded edge of the 'U' to the top of the existing gussetting on the frame behind the rider footpegs. I will strengthen the whole structure with gussetting where necessary.
I really need pics to explain this, but in essence it is a rail running around the outside edge of the tank, with a vertical support running diagonally from the rail to the front engine mounting bracket.
My jerrycans will be mounted in a 'roll cage', which in turn will be bolted to the tank guard and engine guard in a similar position as the cans in the picture above. When I need a light front the 'roll cages' can be bolted to the rear pannier racks, with the weight resting on the passenger footpegs.
I'm hoping the above set-up will weigh less than 7 kg and be able to carry 20kg per side. The engine guards will also mount two small boxes in front of the engine, and a 5lt round plastic water tank or tool box. The boxes/tank will be protected by a bashplate.
I'm making a mock-up this week, will take pics and post them here for discussion. Will also bring pics (and perhaps the mock-up) to the HU UK meet later this month.
What do you think of this?
Yamaha XT600Z 3AJ Tenere
Honda ST1100 Pan European Police