Britbike forum
Hopefully not a stuuupid question..
I purchased the DB34 late last year & part of the spec is the BNR primary belt drive and BNR clutch (Suzuki?) i have always presumed that these run without oil? so was shocked when i walked into the garage and it had deposited the contents of the primary case onto the garage floor :-( inspecting it two of the fasteners had worked loose.
So the question.. i am now guessing the primary does require oil, if so recommendations please?
The BNR clutch setup MUST run dry. I asked bob this question when I bought mine and he stipulated very clearly that it must be dry AND have sufficient air ventilation.
That has confused things :-( The guy i bought the Goldstar from isn't a mug and as owned a few Gold Star's in his time, just puzzled why he would put oil in, the engine & box was built by Phil Pearson engineering & i would have thought he would have passed the info on..... the plot thickens. tbh i just presumed it would run dry & shocked when i walked into the garage to be greeted with a big puddle of oil from the chain case..
are you certain its a newby unit?

some belt drives will work happily in oil.

look for his "BNR" logo on the parts
Have you taken the cover off and peeked inside? If Pearson did it maybe it's his clutch with chain (wet). If a belt maybe the motor has wet sumped a bit and bled into the Primary. No big deal, just leave the drain open.. Mine does this from sitting around too much. PRT
The ONLY reason you might want to run oil in a belt primary would be for the clutch bearing, but it really isn't necessary for road use. Just don't ride the clutch.
Originally Posted by pushrod tom
Have you taken the cover off and peeked inside? If Pearson did it maybe it's his clutch with chain (wet). If a belt maybe the motor has wet sumped a bit and bled into the Primary. No big deal, just leave the drain open.. Mine does this from sitting around too much. PRT


Suppose that's a maybe re wet sumped.... its been parked up for over a month on its side stand, if i get the chance ill have a look Tomorrow..
Originally Posted by pushrod tom
Have you taken the cover off and peeked inside? If Pearson did it maybe it's his clutch with chain (wet). If a belt maybe the motor has wet sumped a bit and bled into the Primary. No big deal, just leave the drain open.. Mine does this from sitting around too much. PRT


Looks like its wet sumped live & learn (To much time with Ducati's i think)any probswith what its doing?
[Linked Image]
© Britbike forum