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Bikes, Hints'n'Tips => FZS600 Fazer => Topic started by: Paulfzs on 12 June 2015, 08:25:55 pm

Title: engine surging/hunting
Post by: Paulfzs on 12 June 2015, 08:25:55 pm

not sure how long its been doing it i think quite some time now but it wasnt noticeable as much untill i put my new exhaust on and i can hear it.


idle at 1200rpm but bounce up and down about 300rpm or so, not eratic but every few seconds itll go up then settle.. when riding along at a constant throttle i can just about feel it but can hear it in the exhaust tone.


ideas?

Title: Re: engine surging/hunting
Post by: noggythenog on 12 June 2015, 08:46:43 pm

Needs the carbs balanced

Title: Re: engine surging/hunting
Post by: Paulfzs on 12 June 2015, 09:03:42 pm

i thought as much, i balanced them before, but new exhaust and a carb clean i had to rebalance but i think i did #4 out and just gave up with "close enough"

Title: Re: engine surging/hunting
Post by: Frosties on 12 June 2015, 10:30:25 pm

Quote from: Paulfzs on 12 June 2015, 08:25:55 pm

not sure how long its been doing it i think quite some time now but it wasnt noticeable as much untill i put my new exhaust on and i can hear it.


idle at 1200rpm but bounce up and down about 300rpm or so, not eratic but every few seconds itll go up then settle.. when riding along at a constant throttle i can just about feel it but can hear it in the exhaust tone.


ideas?

Could be the onset of involuntary Ticks  :lol

Title: Re: engine surging/hunting
Post by: darrsi on 13 June 2015, 07:29:02 am

Plug caps/HT leads, air filter, then carb balance would be my first actions.


Had "hunting" problems years ago on a bike and it was iffy HT leads, even worse in wet/damp weather.


Also check TPS, if that's iffy it will give similar symptoms too.

Title: Re: engine surging/hunting
Post by: Paulfzs on 13 June 2015, 11:15:38 am

best not be leads, cant change them on the fzs has to be new coil :(


ill change the caps because it can only make it better even if i dont notice it.


tps was fine when i last checked about 1000 miles ago.

Title: Re: engine surging/hunting
Post by: darrsi on 13 June 2015, 11:23:05 am

Quote from: Paulfzs on 13 June 2015, 11:15:38 am

best not be leads, cant change them on the fzs has to be new coil :(


ill change the caps because it can only make it better even if i dont notice it.


tps was fine when i last checked about 1000 miles ago.

No harm in taking a few seconds to check the TPS again, a lot can happen in 1000 miles!


Cut 5mm off end of HT leads to start afresh, these are good replacements:


http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=SD05F&_sacat=0 (http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=SD05F&_sacat=0)


Or if you want......brace yourself......buy 4 of these.  :D


https://www.yamahamotorcyclespares.co.uk/product/YAMAHA/5DM823700000/PLUG%20CAP%20ASSY&uid=0 (https://www.yamahamotorcyclespares.co.uk/product/YAMAHA/5DM823700000/PLUG%20CAP%20ASSY&uid=0)

Title: Re: engine surging/hunting
Post by: Paulfzs on 13 June 2015, 09:55:10 pm

#1 and #2 can't be cut they appear to have been cut before they only just fit as it is.


i have 1 new plug cap as i bought it to replace #1 which kept breaking when wet