Check your diaphragm
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MotoGP
Joined: Apr 2006
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From: Kempner, TX
Check your diaphragm
No lady's not THAT diaphragm .
..the carb vacuum piston diaphragm.
A fellow SH owner was in need of a new one due to his having a hole.... I had a bunch of spares so sent him one........he found a crack in the rubber...so I said Id send him another....... I went though 5 sets of spare carbs to find ONE diaphragm without cracks or holes rubbed in them. so from 10 vacuum pistons I had, 9 were bad with holes and cracks in the rubber diaphragm.
Of course I had to check the set on my bike now......and sure enough even though I felt no runability issues, the front one had a small crack in the rubber..likely not leaking much if at all, but it would have soon.
So two new ones ordered up at $62 a piece .. Surprising, that's cheaper then the smaller one I replace all the time on our training bikes..that little mikuni 28mm carb piston is $78.. But a whole new carb is only $198....wish the carbs on our bike were that cheap to replace. ($400 a piece)
So get busy, and check those rubbers for holes boys ...lol
..the carb vacuum piston diaphragm.A fellow SH owner was in need of a new one due to his having a hole.... I had a bunch of spares so sent him one........he found a crack in the rubber...so I said Id send him another....... I went though 5 sets of spare carbs to find ONE diaphragm without cracks or holes rubbed in them. so from 10 vacuum pistons I had, 9 were bad with holes and cracks in the rubber diaphragm.
Of course I had to check the set on my bike now......and sure enough even though I felt no runability issues, the front one had a small crack in the rubber..likely not leaking much if at all, but it would have soon.
So two new ones ordered up at $62 a piece .. Surprising, that's cheaper then the smaller one I replace all the time on our training bikes..that little mikuni 28mm carb piston is $78.. But a whole new carb is only $198....wish the carbs on our bike were that cheap to replace. ($400 a piece)
So get busy, and check those rubbers for holes boys ...lol
Last edited by E.Marquez; Jul 8, 2018 at 11:09 AM.
Thread Starter
Administrator
MotoGP
Joined: Apr 2006
Posts: 4,402
From: Kempner, TX
MSRP full retail is $104.56 each.
Common street price on line is $80.56 each.Yes I just bought a set, at $137.74
Sorry you paid so much, have a look at online retailers next time Partzilla.com $80.63 each https://www.partzilla.com/product/ho...466e917f56e1ff
or $83.60 each Ronayers.com https://www.ronayers.com/oemparts/partsearch/honda
Common street price on line is $80.56 each.Yes I just bought a set, at $137.74
Sorry you paid so much, have a look at online retailers next time Partzilla.com $80.63 each https://www.partzilla.com/product/ho...466e917f56e1ff
or $83.60 each Ronayers.com https://www.ronayers.com/oemparts/partsearch/honda
Thread Starter
Administrator
MotoGP
Joined: Apr 2006
Posts: 4,402
From: Kempner, TX
I have 62 Kawasaki BN125 trainer bikes I maintain...the Mikuni BS28 carb has the main vacuum valve (like ours) and a small coast enricher valve about the size of a quarter. The larger vacuum valve is $75 my cost the smaller one is $95 ..$170 for just two wear items,,,, They sell me the entire carb for $190...
Bit o rubber and plastic (or rubber and brass) is damn pricey
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