After finding that my mk1 was losing oil through the oil tank breather hose at high revs (oil on the back wheel !) I found that the breather hose on top of the gearbox actually has an underpressure (slight vacuum) so i connected the oil tank overflow to the gearbox breather and went for a 'demanding' test ride.
Does anyone else have a lot of crankcase gasses getting into their oil tank......if you put your finger over the oil tank breather do you get a lot of gas blowing out, especially at higher revs ?
This was exactly the same situation before i rebuilt the engine too, so I don't think it was as a result of anything I've done in the rebuild.......there just seems to be a lot of gas being returned to the tank with the oil, as if the dry sump pump is gulping oil and gas from the sump.......with so much splashing going on in the tank a lot of smaller oil droplets seem to have been getting blown out of the breather with the escaping gasses.
Being a 360 degree twin, both pistons move up and down together, so there is compression and release of gasses in the crankcase on a larger scale than if the pistons worked in opposition.....you can feel the effect of that at the main crankcase breather hose where there's a lot of pulsing
Fitted the IXIL 2into1 from ramo - well, yesterday.
IXIL 2into1 fit 023.JPG
Today I adjusted it back a bit to give the brake pedal some clearance.
Tomorrow I'll give it a run.
Looks smart Steve. Does it sound well ?
Ohlins, PC3, fuel cut defeat, +4deg timing, 17" front wheel.