SV650.org - SV650 & Gladius 650 Forum



SV Talk, Tuning & Tweaking Discussion and chat on all topics and technical stuff related to the SV650 and SV1000
Need Help: Try Searching before posting

Reply
 
Thread Tools
Old 19-01-18, 02:40 PM   #1
simon1
Member
 
Join Date: Nov 2017
Posts: 80
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
simon1 is offline   Reply With Quote
Old 19-01-18, 04:45 PM   #2
garynortheast
Member
Mega Poster
 
garynortheast's Avatar
 
Join Date: Mar 2010
Location: Mid Wales
Posts: 2,475
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.
garynortheast is offline   Reply With Quote
Old 20-01-18, 11:20 AM   #3
simon1
Member
 
Join Date: Nov 2017
Posts: 80
Default Re: running problems

Hi
I have done all the above.......does a dodgy regulator make a bike run rough??
simon1 is offline   Reply With Quote
Old 20-01-18, 12:33 PM   #4
Talking Heads
Member
 
Join Date: Jan 2017
Posts: 486
Default Re: running problems

Worth checking the carb rubbers for cracks too.
Talking Heads is offline   Reply With Quote
Old 20-01-18, 03:07 PM   #5
DuncanC
Member
 
Join Date: May 2016
Location: Wantage
Posts: 68
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.
DuncanC is offline   Reply With Quote
Old 20-01-18, 04:38 PM   #6
embee
Member
Mega Poster
 
embee's Avatar
 
Join Date: Jul 2003
Location: Warwickshire
Posts: 2,801
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.
__________________
"Artificial Intelligence is no match for natural stupidity"

Last edited by embee; 20-01-18 at 04:39 PM.
embee is offline   Reply With Quote
Old 20-01-18, 06:24 PM   #7
maviczap
Member
Mega Poster
 
maviczap's Avatar
 
Join Date: Mar 2007
Posts: 9,096
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
__________________
We're riding out tonight to case the promised land
Make everyday count
RIP Reeder - Jolly Green Giant and comedy genius
maviczap is offline   Reply With Quote
Old 20-01-18, 09:00 PM   #8
simon1
Member
 
Join Date: Nov 2017
Posts: 80
Default Re: running problems

Thanks guys.......embee,what is the mosfet one?....is it better....do you have a link...thanks
simon1 is offline   Reply With Quote
Old 20-01-18, 09:10 PM   #9
maviczap
Member
Mega Poster
 
maviczap's Avatar
 
Join Date: Mar 2007
Posts: 9,096
Default Re: running problems

Quote:
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
__________________
We're riding out tonight to case the promised land
Make everyday count
RIP Reeder - Jolly Green Giant and comedy genius
maviczap is offline   Reply With Quote
Old 21-01-18, 01:10 AM   #10
embee
Member
Mega Poster
 
embee's Avatar
 
Join Date: Jul 2003
Location: Warwickshire
Posts: 2,801
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).

__________________
"Artificial Intelligence is no match for natural stupidity"

Last edited by embee; 21-01-18 at 01:12 AM.
embee is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Running Problems FlyinCustard SV Talk, Tuning & Tweaking 28 24-10-09 04:36 PM
running problems maybe? kwak zzr SV Talk, Tuning & Tweaking 14 16-06-07 10:47 PM
Running problems watto SV Talk, Tuning & Tweaking 4 10-11-06 11:54 AM
Running Problems Marshall SV Talk, Tuning & Tweaking 22 09-10-06 09:27 PM
Running Problems Claire SV Talk, Tuning & Tweaking 6 12-12-05 09:05 AM


All times are GMT. The time now is 06:50 AM.


Powered by vBulletin® - Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.