Technical Discussion Topics related to Technical Issues

Check your diaphragm

Old 07-08-2018, 11:01 AM
  #1  
Moderator
MotoGP
Thread Starter
 
E.Marquez's Avatar
 
Join Date: Apr 2006
Location: Kempner, TX
Posts: 4,173
E.Marquez is on a distinguished road
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

Last edited by E.Marquez; 07-08-2018 at 11:09 AM.
E.Marquez is offline  
Old 07-12-2018, 08:08 AM
  #2  
Member
Squid
 
Join Date: May 2012
Location: SW Wisconsin
Posts: 52
jjansenrs is on a distinguished road
Did you buy OEM ones? I just bought a set for $100 a piece.
jjansenrs is offline  
Old 07-12-2018, 10:34 AM
  #3  
Moderator
MotoGP
Thread Starter
 
E.Marquez's Avatar
 
Join Date: Apr 2006
Location: Kempner, TX
Posts: 4,173
E.Marquez is on a distinguished road
Originally Posted by jjansenrs View Post
Did you buy OEM ones? I just bought a set for $100 a piece.
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
E.Marquez is offline  
Old 07-12-2018, 07:36 PM
  #4  
Senior Member
MotoGP
 
smokinjoe73's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 4,898
smokinjoe73 is on a distinguished road
Those are that expensive? Why does that seem like a lot of green for 2 flimsy rubber diaphragms?
smokinjoe73 is offline  
Old 07-12-2018, 09:13 PM
  #5  
Moderator
MotoGP
Thread Starter
 
E.Marquez's Avatar
 
Join Date: Apr 2006
Location: Kempner, TX
Posts: 4,173
E.Marquez is on a distinguished road
Originally Posted by smokinjoe73 View Post
Those are that expensive? Why does that seem like a lot of green for 2 flimsy rubber diaphragms?
Well it is the resin / plastic valve as well.. But ya, I know what you mean.

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
E.Marquez is offline  
Old 07-14-2018, 12:42 PM
  #6  
Member
Squid
 
Join Date: May 2012
Location: SW Wisconsin
Posts: 52
jjansenrs is on a distinguished road
I went through my local dealer. I guess that's why. Oh well, They were able to get them in less than a day.
jjansenrs is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
afm528
Technical Discussion
3
08-27-2013 03:55 AM
twist
Technical Discussion
4
01-19-2013 07:34 PM
pwolski
Technical Discussion
0
02-02-2010 07:29 AM
jmpovh
Technical Discussion
2
12-15-2008 06:08 AM
Vincent
Technical Discussion
8
08-10-2007 07:04 AM


Thread Tools
Search this Thread
Quick Reply: Check your diaphragm


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.