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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?

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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.


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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..

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are you certain its a newby unit?

some belt drives will work happily in oil.

look for his "BNR" logo on the parts


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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

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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.


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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..

Last edited by SteveT; 07/02/16 3:23 pm.
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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?
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