Hesitant after diaphram change!!

[Lucky_Lou]

Well according to them these are fine and they haven't had any problems with them!!so you have to take their word for it i guess,why doesn't it show up being hesitant when you just rev the bike?i guess it has to be under load,ie,when your on the move.

I live and sometimes work near Motorworks so i used to call in for my parts during my rebuild forming a good relationship with the guys on the trade counter after less than fifty miles i was struggling with diaphragm issues especially when using fuel additives i did post some pictures of the impact on the rubber.
At first i phoned them and got the boss who said bring them back and we will swap them which i did, same problem with the replacement, so i called in (again) and the guy on the counter exchanged them for bing origonals (no charge) saying i dont know why we bother with "Those" they are a pain !! ive done 5k miles without a problem since.
Lou

[Barry]

he guy on the counter exchanged them for bing originals (no charge) saying i don't know why we bother with "Those" they are a pain !!

That was exactly my point. If a reputable dealer refused to sell the generic ones it would flag up to everyone that they are no good.

A better solution all round might be for the dealers to say to the generic part supplier "your diaphragms keep coming back sell me ones that work or I ain't buying anymore"

[beemer]

which rubber connector Lou?  

#3


http://www.realoem.com/bmw/showparts.do?model=0364&mospid=51897&btnr=13_0455&hg=13&fg=05

That HAS to be an air-tight seal.  It can be checked by spraying carb cleaner on them while the engine is running.  If the RPM's rise, you know you have a leak.
The rubber gets hard over time and can even crack.  Best to replace them every 10 years or so.

Thankyou,i will check them.

[beemer]

Well according to them these are fine and they haven't had any problems with them!!so you have to take their word for it i guess,why doesn't it show up being hesitant when you just rev the bike?i guess it has to be under load,ie,when your on the move.

I live and sometimes work near Motorworks so i used to call in for my parts during my rebuild forming a good relationship with the guys on the trade counter after less than fifty miles i was struggling with diaphragm issues especially when using fuel additives i did post some pictures of the impact on the rubber.
At first i phoned them and got the boss who said bring them back and we will swap them which i did, same problem with the replacement, so i called in (again) and the guy on the counter exchanged them for bing origonals (no charge) saying i dont know why we bother with "Those" they are a pain !! ive done 5k miles without a problem since.
Lou

Iv'e just spoken to motorbins regarding these diaphrams,they say they have sold these to hundreds of people and also used them themselves and never had a problem with them!!ever!!!SO,i will check other things and then will have to buy some Bing ones i guess,strange that they say this though!.I also spoke to the other independent bmw spares company,they sell nothing but the Hydrin diaphrams and again say they have no problems with them,and say they work better with today's fuel then the original type!!.

[beemer]

Yes these are the "non bing"type,can anything be done?or do i have to replace them?thanks.

I was one of the folk with trouble with these only fit Bing originals the generic ones are cr*p especially troublesome if you have the flat top carbs. Also check the rubber connector to the heads have been properly refitted.
Lou

Do the rubber connectors need to be really tight?or will they get damaged if you should overtighten them?

[montmil]

Do the rubber connectors need to be really tight?or will they get damaged if you should overtighten them?

Before you really crank down on the clamps, pull the short hose connectors -the ones between the carb and cylinder head- and check for any cracks that may be discovered within the interior of the hoses. These rubber bits can look fairly OK with an exterior visual inspection, but I found one of mine badly decomposed, and leaking air, due to a bad sealing to the cylinder head stub from the poor I.D. condition of the hose.

Monte

[Rob Valdez 79 R65]

If you don't know the history of the rubber connectors, I would replace them so you have a baseline.

[beemer]

If you don't know the history of the rubber connectors, I would replace them so you have a baseline.

Yes i think i will replace them,thanks for the advice guys.