I think I know the answer to this anyway but I thought I’d get the opinion of the collective. This is a photo taken down the cam chain tunnel (vertical head is off due to a cracked head so it needs to be replaced). The teeth on the intermediate water pump gear don’t look too good to me . FUBAR or OK?
This, https://www.ebay.co.uk/itm/17737313...QNZ8CE&hash=item294c432d7a:g:668AAeSwzQ9osV7I, is what it looks like new. Memory keeps trying to convince me the plastic gear is a known weakness and a metal alternative is available. My memory of course could be poor. Andy
been down this route, my oil pump gears stripped the question to ask is whats causing the wear? if its something impeding the pump, putting pressure on the gears there are metal replacements from moto rapido, but without digging into the engine, maybe that would cause something else to brake how many mile has it got?
i have learnt what bits in the oil can do something got into the actual metal oil pump, putting stress on the cogs, i was pretty much flat out and the oil pump gear cogs sheared causing a drop in pressure, you can imagine the rest.
If you look the primary gear should be split and spring loaded to prevent chatter. The plastic gears are all on an undamped gear train and in my opinion the constant chatter between the gears breaks the teeth. The 3 engines i have done all have steel oil pump drive gears.
As I suspected. The replacement gears were ordered before 5pm today, but I’m glad to see the confirmations of my suspicions. And what caused you to go in there? For me, I only saw it because the head was off. Unknown, it’s a track bike, different dash. I’d have to read the BBS to see, if even that’s accurate as he’s running a GPS Speedo. I was also told it was to act as a point of failure should the water pump seize and prevent trauma elsewhere. Whether that’s what was intended or not I don’t know. I suspect it’s just to save money on production costs and reduce weight & noise.
I was going into check the gears as I was unsure if the 1299s had plastic gears. Both of our 1199s had the usual yellow plastic shrapnel when the oil was drained, and I found some in this bike oil as well, but the cover was coming off anyway. One 1199 was a pure track bike with 3.5k, other one had 9k road and track. The 1299 has 14k with only a couple of track days.
i spoke to the guy at moto rapido and he said only water pump gear upgrades are available in metal for 899s, i having a full rebuild if i can i may as well get rid of all plastic oil and water pump gears and put metal ones in
