Recent content by Formula390

GTiTDi, I've sent you a PM for more info.

The factory at Bajaj in India is WELL known for practically randomly tapping the threads with 1.25 and 1.5 thread pitch. I suspect some of the workers don't even realize there's a difference and just grab whatever M10 tap is handy. I've seen swingarms with both threads (1.25 on one side, 1.5 on...

Sounds like you have the wrong thread pitch and just cross threaded the mount holes in your swingarm.

You can use anything for lube when torquing the bolts. Grease, Olive oil, personal lubricant, just something.

I think most have gone with a secondary sensor, similar to you. Placement can be VERY important, but it's bone simple to do, and very reliable. I once epoxied a thermocouple to my radiator next to the intake flange, with the probe being very accurate and responsive. Not as good as the probe...

Not sure where 40k units came in here. I'm WELL aware of the platform and reused parts between the models, considering my ENTIRE business centers on the 390 platform. I never said NO bikes had higher miles! I said MOST have under 15,500 miles. Globally. It's not like riders are going to...

Engines are simple beasts. They need: - Fire - Fuel - Pressure - Air Debug your Crank Won't Start in that order of priority. One of them is bad.

You can't just check the perimeter. You have to check flatness with something like a machinist square or steel rule. This is because the heads are frequently still perfectly flat around the perimeter, but are outside of the spec (0.004" if I recall correctly) on the inside... where combustion...

:) Most RC390's are not seeing anywhere near 15,500 miles. Yes, there are plenty I'm sure which have more miles than that, but I would wager that 90% of the fleet, even back to the 2015 models, are still well under that mileage. A lot of folks have also switched to the manual chain tensioner.

Most failures have occurred with the J tube header for the undertail exhaust systems. The under slung type has had a failure or two. The biggest causes of the failures have been from the exhaust being under tension while being bolted up. The tear of the metal has typically been next to the weld...

Higher pressure cap for water pressure for higher boiling temps will in no way contribute to headgasket failure. A 1.4bar radiator cap isn't even CLOSE to the pressures of the combustion chamber. The head gasket failures were largely being caused by two things: 1) The heads were machined flat...

There's none that will do what you want without losing a bunch of HP. The stock exhaust makes a ton of 180° turns in the black exhaust box. The 390 motor is CRAZY sensitive to exhaust length. The options for not having a side exit are the two dual under tail exhaust systems. There's the...

Pull it and measure diameter and thread pitch. It's not specified in the manual what it is, so the only way to know is to get eyeballs, calipers, and thread gauges on it.

Check all three of the abs fuses, and wiring connections first. There are two fuses for the ABS which are located under the protective cap next to the negative terminal of the battery. These fuses protect the return pump and the hydraulic unit of the ABS. The third fuse, which protects the ABS...

The header changed and is shorter, so that won't fit. You also REALLY don't want that exhaust! It's painfully loud, and you'll lose about 3-4hp.