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SB8RS black smoke

 
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atomibart



Joined: 11 Apr 2011
Posts: 120
Location: France

PostPosted: Thu Jan 23, 2020 9:13 am    Post subject: SB8RS black smoke Reply with quote

Hi everyone,
My SB8RS runs very badly for a few weeks…

Last year when I rode it it was hickuping at mid-rev (around 4500 rpm), so I tried to fix it myself by moving the TPS...which resulted as a catastrophy. I put the TPS back in place but after that the bike would not start.

So I put in a bike garage that managed to start it again.
And now they tell me that the smoke coming from the exhausts is very black and they don' t know how to fix that.

Someone on the forum has any idea of what I could do ?

Maybe if I had a diagnosis tool for the SB8's injection I could know what's going on…

Thanks for any help...
atomibart
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Fri Jan 24, 2020 12:27 am    Post subject: Reply with quote

Take the spark plugs out a see if either of them are oily. Compare the two a see if one is different.
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atomibart



Joined: 11 Apr 2011
Posts: 120
Location: France

PostPosted: Mon Jan 27, 2020 8:17 am    Post subject: Reply with quote

Thanks evilchicken, I will check this point
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Andrew034



Joined: 02 Apr 2017
Posts: 52
Location: Sydney

PostPosted: Tue Jan 28, 2020 2:42 am    Post subject: Reply with quote

Black smoke normally is indicative of running very rich, if the spark plugs are wet with fuel, you have your confirmation.

If both spark plugs are evenly wet or sooted then it is likely the fuel injection system is the issue. However if one sparkplug is sooted (or wet) and the other normal you may have a leaking injector.

Playing with the TPS will affect the fuel curve and it may also affect the ignition curve (depending on how Bimota set the system).

Further if one for sensors for air pressure, air temperature or engine temperature are malfunctioning the ECU may consider the bike is very cold or at the bottom of a mineshaft and increase the fuel accordingly.

I don't know what system the SB8R uses, however due to it's age it might have an OBDII complaint system, so it should be easy to check basic parameters (i.e. sensor and faults). Notwithstanding, most of the sensors can be tested manually.

The TPS will require a more dedicated tester or knowledge of it's base settings to correct (did you at least measure the voltage before adjusting it?)

Good luck

Andrew...
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atomibart



Joined: 11 Apr 2011
Posts: 120
Location: France

PostPosted: Tue Jan 28, 2020 1:00 pm    Post subject: Reply with quote

Thanks Andrew.
I will suggest the workshop guys to check all these points.
Cheers
atomibart
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Tue Jan 28, 2020 7:19 pm    Post subject: Reply with quote

Does it have a power commander ???
As far as I know these were notorious for over fuelling as standard, a commander from a triumph triple was usually used with one cylinder blanked.
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Tue Jan 28, 2020 7:28 pm    Post subject: Reply with quote

Try this thread

http://www.bimotaforum.co.uk/viewtopic.php?t=5624&highlight=sb8+power+comander
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