I think the divvy is going to die...

[sidewinder]

So the divvy had a problem.engine is running smooth not missing .all four headers are at the same temp checked this with a temp probe from work.it just been serviced new filters fuel air and oil .new plugs gapped to spec and carbs recently balanced.
but it seems to be totally down on power as if it is running on 3 cylinders but it's definetly not.must be something wrong I could not keep up a gs500 this morning .any ideas of what it could be this one has me stumped.

Cheers all

[nowhere.elysium]

Have you checked for air leaks? Have the valve clearances been checked any time recently? Are the coils in good nick?
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[Baffler186]

What's the nature of the power loss i.e. are there noticeable flat spots, is it jumpy, or is it all totally smooth but feels like you're down 30HP?
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Current: 2009 SV650 S, 1990 Kawasaki GT550
Previous: 2009 CBF125, 1998 GSF600, 2004 FZ6 Fazer, 1978 CB400a Hondamatic

[sidewinder]

It feels smooth but down on power.no flat spots runs fine .just got very slow

[sidewinder]

[Clutchy]

Compression test?
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Malaguti F12 Phantom-Dead, Suzuki AY50- Dead, NRG power DD LQ, CBR125.
*33 BHP restriction up on 10/12/14* Current bikes/car: SV 650 S/ MKIV GOLF
Guide to pass your test with no lessons!

[sidewinder]

Good point on compression test.but it's not using oil or any visable blue smoke

[A100man]

A couple of basic ones..

Binding brake.. Throttle not opening fully..

[sidewinder]

Compression test just been done all cypinders s are within specs.brakes not binding they have also just been done.could it be coils or the rectifier?

[raak]

[Baffler186]

[sidewinder]

Battery is pretty new and lights get brighter when revved a bit..I just don't think it is electrical.the bike is running fine not missing or any thing.it pulls fine but not with the same power as before.fuel filter was changed and fuel is running clear through it.its topping out at 80ish almost feels like it's restricted...starts first time all the time from hot and cold.could it be the choke not closing completely that's all I can think of now

Cheers for the help so far all

[el_oso]

I've had something similar on my thundercat. I somehow managed to twist the fuel hose after having the tank off which restricted the fuel flow.

maybe time to give the carbs and overhaul.
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

[talkToTheHat]

A plague on Viragos is sticking carb slides and ruptured diaphragms, causes lumpy running and lack of power but no cold headers at idle, divvy is from same era, do same problems apply?
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Bandit. does. everything.

[sidewinder]

Fuck yeah fixed it

As mentioned above removed carbs stripped them all nice and clean.fuel lines etc all ok .then misses came out with bacon .and said whats that rattling sound coming from the exhaust.took a look and guess what the spring which holds the baffle in place had come of .causing the baffle to sit at a angle.blocking half the pipe of.so put it back in place replaced the spring.and hey presto back to it full 63bhp .runs a lot better now

Cheers for the help again all

[A100man]

good result.

[Ballpien]

Bacon saves the day
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R125 - FZ1n ABS

Looking forward to the 5,000,000th post in 2017

[sidewinder]

Bacon rules.a d the bike still seems to be ok