Hello and running problems.

hi i have a 2000 sv650 s which i have just brought to try my luck at mini twins it is ment to be 72bhp but no prof its fitted with a bmc filter re jetted ?? full system and a techi flow adj rear stock .its not a day light mot just be out 4 my first ride but after 20 mins it starts to miss fire any idea's please lady's and gents???
what spark plugs should i use ??
manythanks for taking timeto read this
bigcookie

[kaivalagi]

Firstly I am sure someone with vastly more experience than me will pipe up soon...

I think I get what you're saying...Curvy SV with BMC filter, re-jetted, full system exhaust, adj rear shock and no lights etc hence the daytime MOT, and you have mis-firing after a little bit.

I'd take the spark plugs out and inspect them first, it may be they just need cleaning/replacing

It wouldn't hurt to get yourself a copy of a service manual either...not sure where the link is but a PDF version is get-able

Maybe others can give a more concrete list of inspections/adjustments to make to the bike to eliminate any problems there might be

pm me your email and ill send you the pdf
also have the parts fische aswell
as for plugs
i run standard cr8e for drag racing using avgas 108 octane and theyre fine and have been for the past year or so

check your choke is not closed
also clean the carbs out drain out old fuel etc.

[andrewsmith]

sounds like the jetting is to large- thus running lean. Drop Yorkie Chris a message he should be able to confirm that.

Whats the changes to exhaust also? What size jet is in the Carbs?

Bigcookie- so your aware minitwins have to run 'forecourt' fuel (95, 97 or 102 [if you've got money to burn ] petrol or E85 ethanol). 108 RON/ Avgas is ilegal.
Irridum CR8E or 9's are the best for the motor

[jambo]

Originally Posted by andrewsmith

sounds like the jetting is to large- thus running lean.

I suspect big jets would make it rich.

Originally Posted by andrewsmith

Bigcookie- so your aware minitwins have to run 'forecourt' fuel (95, 97 or 102 [if you've got money to burn ] petrol or E85 ethanol). 108 RON/ Avgas is ilegal.

Luckily he wasn't the person who mentioned running it, and that wasn't for minitwins so should be fine.

Start with the basics. Choke plungers can stick partly on (especialy on the front carb) This leads to a running problem that gets worse as the motor warms up (as mentioned by madandy).

Inspecting the plugs can be worth doing as an aid to seeing if one is blacker than the other etc, but damaged plugs are rarer nowadays

Jambo

[andrewsmith]

Originally Posted by jambo

I suspect big jets would make it rich.

Luckily he wasn't the person who mentioned running it, and that wasn't for minitwins so should be fine.

Depends Jambo
If the jet is too small for the exhaust system (not enough fuel getting through).

I know, just made sure it was mentioned, as Madandy runs avgas.
But as you've said start with the likely ones and work from there

hi gents and thnkd for the advice
well i took the plugs out today 1 was a cr9e back cylinder and front had cr8e ix which was black
some new cr8e in went for a ride was still running back as soon as i openedthe throttle it was bereeeeeee shut it runns normaly,
lucky my neighbour Bob brooks the drag bike racer was out side i told him he said it getting to much air in so took tank off again lol and he said was the tape over the bmc filter then i remember when i first got the bike i saw the tape and though why thats there i know tohold it in now looking like a donkey he taped half it up again !! got it out again a pulls like a dream wheeeeelllieeeeeeeee good lol
now i just need to put a rev counter and speedo so i know the speed
thanks and hope to see someof you out and about maybe at the minitwins at snetterton
bigcookie

[kaivalagi]

Glad you got it sorted, have fun with those wheelies and I'll no doubt see you about

You'll have to come for a ride one weekend with the EAR gang, it would be great to have a track bike out with us! Just keep an eye out in the EAR section for spur of the moment ride outs...we had a little one out to Hunstanton and around abouts Monday just gone and I expect there to be a few more yet