Evening All,

I purchased my lovely MC21R last week, what a pocket rocket

one little problem, there seems to be petrol & oil leaking from somwhere

The guy that owned it before me ran on premix, He put the oil pump back on for me just before i purchased.

There was some fuel left in the tank so I filled up to dilute the premix & also filled the oil up with fully synthetic.

I have stripped the bike down & checked to see if any loose bolts around the reed block & carbs.
All seemed fine. Went to use this evening and as I was taking out the garage a trail of oil / petrol. The oil looks v fresh.

As a newby I at a lose, could it be a gasket or adding the oil pump??

any help would be appreciated

sounds like a oil hose has poped off maybe!
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Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.

I have checked all the oil pipes to the pump etc. all seem to be secure.

Is it oil or petrol?
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

there are pipes going to the carb and elseware on the nsr's so check on the carb that they are conected and that theres no holes in them, are all the screws on the pump torqued? if its petrol check the pipe maybe theres dirt in the carb float bowl keeping the float needle open drain half a litre thru each if it looks like it could be if not strip the carbs and clean them dont disturb the settings if possible tho.

hope this helps
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Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.

parky69 wrote:I have checked all the oil pipes to the pump etc. all seem to be secure.

What about from the pump to the inlet manifold?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

If the leak is more oil than petrol, my guess would be that the guy forgot to put back the oil seal back on the oil pump shaft. This'll mean that the cases fill up with 2-stroke oil and comes outta the overflow pipe. Happened to me. It's an easy fix , just need to order up a new seal, check the Online Part Manual on this site.

The tell tail sign is opening up the gearbox oil top-up plug (???) and see if load of oil spills out, i.e. it's over full.

Good luck

I had an Aprillia RS 250 that had a fuel leak. It had sit a long time with no fuel.The seals in the float bowl had dried out and were leaking.