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+--- Thread: engine surging/hunting (/showthread.php?tid=72860)
engine surging/hunting - Paulfzs - 12-06-15
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?
Re: engine surging/hunting - noggythenog - 12-06-15
Needs the carbs balanced
Re: engine surging/hunting - Paulfzs - 12-06-15
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"
Re: engine surging/hunting - Frosties - 12-06-15
(12-06-15, 08:25 PM)Paulfzs link Wrote: 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
Re: engine surging/hunting - darrsi - 13-06-15
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.
Re: engine surging/hunting - Paulfzs - 13-06-15
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.
Re: engine surging/hunting - darrsi - 13-06-15
(13-06-15, 11:15 AM)Paulfzs link Wrote: 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
Or if you want......brace yourself......buy 4 of these.
https://www.yamahamotorcyclespares.co.uk/product/YAMAHA/5DM823700000/PLUG%20CAP%20ASSY&uid=0
Re: engine surging/hunting - Paulfzs - 13-06-15
#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