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Old 19-01-18, 02:40 PM   #1
simon1
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Default running problems

Hi
I just bought a gen1 sv that's had been sitting for 6 months.....starts fine,idles ok....but fluffy and back fires when trying to rev..also back fires a bit of petrol out of the rear carb with the air box off....I have cleaned the carbs and checked the plugs...and checked for air leeks,all seem ok.....what else could it be?

thanks
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Old 19-01-18, 04:45 PM   #2
garynortheast
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Default Re: running problems

New plugs, new tank full of fuel, remove and clean the choke plungers, lube the choke plunger cables and the throttle cables and linkage, synchronise the carbs with a vacuum gauge, clean/replace the air filter.

Then let us know how it runs.
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Old 20-01-18, 11:20 AM   #3
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Default Re: running problems

Hi
I have done all the above.......does a dodgy regulator make a bike run rough??
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Old 20-01-18, 12:33 PM   #4
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Default Re: running problems

Worth checking the carb rubbers for cracks too.
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Old 20-01-18, 03:07 PM   #5
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Default Re: running problems

It could be old plug caps and HT leads, that can cause rough running as soon as there is any load on the spark.
Also crud in the carbs, it might be sucking gunk up and blocking a jet as soon as the fuel starts to move a bit quicker.
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Old 20-01-18, 04:38 PM   #6
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Default Re: running problems

Quote:
Originally Posted by simon1 View Post
Hi
I have done all the above.......does a dodgy regulator make a bike run rough??
Mine is in exactly this condition at the moment. When I ran it up a few weeks ago just to keep it from gumming up over winter it wasn't running properly at all, like you say it doesn't rev properly. Did a bit of measuring and the RR has definitely died on mine. Check the voltages.
Mine is not getting above 13.5V at any condition and barely 13V lights on.
Fortunately I have a MOSFET one sitting waiting to be fitted, it was a case of when I get round to it, now my hand has been forced.
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Last edited by embee; 20-01-18 at 04:39 PM.
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Old 20-01-18, 06:24 PM   #7
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Default Re: running problems

Quote:
Originally Posted by simon1 View Post
Hi
I have done all the above.......does a dodgy regulator make a bike run rough??
Quote:
Originally Posted by embee View Post
Mine is in exactly this condition at the moment. When I ran it up a few weeks ago just to keep it from gumming up over winter it wasn't running properly at all, like you say it doesn't rev properly. Did a bit of measuring and the RR has definitely died on mine. Check the voltages.
Mine is not getting above 13.5V at any condition and barely 13V lights on.
Fortunately I have a MOSFET one sitting waiting to be fitted, it was a case of when I get round to it, now my hand has been forced.
Mine ran rough when the RR died
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Old 20-01-18, 09:00 PM   #8
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Default Re: running problems

Thanks guys.......embee,what is the mosfet one?....is it better....do you have a link...thanks
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Old 20-01-18, 09:10 PM   #9
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Default Re: running problems

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Originally Posted by simon1 View Post
Thanks guys.......embee,what is the mosfet one?....is it better....do you have a link...thanks
Mosfet ones are better than OEM, I can't remember what MOSFET is,

Here's a link. But check how many plug connections your RR has, some of the last curvies have 2, some have one.

Mine had two, a late 2002 curvy

http://www.electrexworld.co.uk/cgi-b...5%2ehtml#aRR85

http://www.electrexworld.co.uk/cgi-b...rch&PR=-1&TB=A
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Old 21-01-18, 01:10 AM   #10
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Default Re: running problems

https://en.wikipedia.org/wiki/MOSFET
basically the type of semi-conductors used in the RR. They have lower volt drop across them and produce less heat etc, better reliability and more stable voltage regulation typically. A lot of bikes use them now, they "usually" have 2 sockets on them, one with 3 wires for the alternator supply, one with normally 2 wires for + and - output (may possibly have a third but usually just 2).
I got mine used off ebay, there's no hard and fast guide for which bike model to go for. The MOSFET ones usually have a code on them which will be FH010 or FH012 or FH020 etc. The higher numbers usually mean greater current capacity I think, or later versions.
You'll usually need to alter the wiring a bit on your bike to suit, normal 6.3mm spade connectors will go straight on the contacts as long as you know which is which, or you can get the correct sumitomo (?) sockets.
Try a search for Shindengen on the net for info, Eastern Beaver can be a useful source of info and connectors if you want to go that route (I haven't).

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Last edited by embee; 21-01-18 at 01:12 AM.
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