Bottom Plugs: Owner complained the vehicle pinks in the heat, & as the ignition goes to full advance (circa 3500-4000 rpm). Dual plugged, & the advance curve is both faster & shorter than stock. Left hand side bottom Right hand side bottom Both plugs cleaned & reinstalled. Hmmm, may be time to instal the new/old barrels I have waiting in the wings. Sidecar Suspension: Pulled apart the sidecar suspension to repair this following it collapsing on the Caravan of Foods Tour. This has a leading swing arm, with torsion bar spring. The spring is basically a round bar with splines at each end. This runs across the rear frame of the sidecar. The male splines both looked good, the female spline at the swing arm was good, which left the female spline in the frame. It turns out that this was spinning in the frame (albeit with some friction), so the spring wasn't able to work. I've resolved this by drilling through the frame & into the outside material of the female spline (but before hitting the spline material) to create a key. I've welded a nut over the hole, to strengthen that, & to provide a threaded point for a bolt anchor. I've also shaped a 12.9 grade 8mm bolt to duplicate the shape of the drill bit, & threaded that into the hole. I did consider plug welding the spline - but didn't as at some stage I may want to remove it. I have also considered mirroring this on the other side of the frame. Still considering if this is necessary. Tested, & it seems good to go. Had a successful test ride to Otaki Forks last night with precious cargo. No complaints. Sidecar Mudguard Stay: The middle stay broke during the trip. I've welded that back together & reinstalled. But that whole mudguard assembly is twisted (probably from the factory), so I'll need to give consideration to how I deal with this longer term. The stay attaches to the sidecar leaf spring retainer (between the tub & the sidecar frame). Paralever: I could feel something moving from time to time during the trip. Turns out the fixed Paralever pivot (on the inner side of the swing arm) had backed out slightly, which allowed some movement. This is usually both red loctited & torqued in place, so it's a bit concerning, & may be a weak point of the paralever for this application. The bearings are (maybe unsurprisingly) also fairly worn (though I do have spares). For the meantime I have reloctited the pivot in place & reassembled, which has taken out the play. I may change to the Emerald Island bushes longer term. Nuts & bolts: Amazing how much the corrugations (during the trip) allowed the nuts & bolts over the sidecar to loosen. I'll be replacing a number with nyloc nots. However even some nyloc nuts loosened if there was enough play in the assemblies they held. A good example of this is the two holding the rear mudguard stay (you'll recall the mid stay broke & I held that together with duct tape). Also noted the top rear sidecar stay mount (on the sidecar) had loosened (despite a nyloc nut) as had the top front side mount (on the tug, also using a nyloc nut). Exhaust: Switched back to the quieter SV exhaust. The Leo Vince can likely needs repacking, but the final nail was the level of pops & bangs I was getting (& was unable to tune out).