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hi everyone
does anybody know if cold weather affects the little 400 motor
mine in summer was superb yet this winter spits and bogs @6000rpm just before all hell breaks loose!!!!
help or ideas would be much apprieciated??
by the way happy new year to all members!

hi steven welcome to the forum!

Sounds like a flat spot, but for it to suddenly appear is a bit odd

Have you changed anything like the exhaust recently, or added a new air filter?

hi thanks for reply!!
no not done much really apart from havent used it hardly since summer,
oh just changed to a 14t sproc .... and a clean!!!
its also kept in a unheated garage ,can electrics condensate or somethin???
cheers

If its been sat for that long then its might be gummed up carbs. The fuel crystalises and turns into a goo and blocks things up a bit.

My advice would be to run some Redex through a few times as thats great stuff for cleaning up carbs as well as the rest of the engine. Give that a go

as robB says more than likely a fuel problem mate, could be worth dropping the float bowls off and cleaning them out.

thanks for your help ...think ill try the redex first ! as droppin the floats maybe a bit technical for me,im a builder and used to swingin sledges about!!!!
will let every body know the outcome..
if you see in wanted section carbs the redex didnt work and ive f**ked the carbs up trying to clean them(with a hammer ofcourse!!!!!!!!!!!!!!!!!! ha ha)
only jokin thanks for help...
als can a smaller fuel filter restrict the flow?? as the one on mine is alot bigger than a new one that ive bought??
cheers....

steven2558 wrote:
im a builder and used to swingin sledges about!!!!

what do you build? igloos?

very good!! left myself wide open for that one didnt i !!!!

hi
ran redex through today,after about 1/2 hour it seemed to make a massive differance(revving faster)
thanks for your help everybody!!

Glad to hear it mate, has that flat spot cleared?

Just run that through, and see how it is after you put in petrol without the redex.

yep flat spot seems to of cleared!!
revs better but noisier though the exhaust!!!
(or that could be me imagining things????)
thanks again.........

give it another run today after refuelling,and an airfilter,
its superurb now no problems(touch wood)
revs cleanly right through to redline with no hiccups!!!
cheers for your help everybody