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Post by petehodges on Jul 2, 2016 18:56:34 GMT 1
evening all really could do with your knowledge please long story cut short got ypvs lc hybrid just got it back off trubrit (dave) who's put brand new igntech ignition light weight flywheel on the bike as the stator was goosed so the sparks all good topjob done dave anyway on too the problems I've had someone look at the bike for me before dave he said he had it running a couple of times but it never started for me he set the carbs up & mot bike for me I'm Running a standard ypvs with 31k carbs main jet 270 pilot 30 airbox with no filter or snorkel ,float height set at 21mm allseed exhausts it starts are ticks over fine but as soon as you get it on the road problems begin it feels like bogging down as soon you pull away then it starts too only run on one cylinder then both cut in then one cuts out I've been out on it today but only short ride as its allfull to ride checked plugs there darkish brown & seemed wet to touch. must add I'm a bit green with these bikes & don't really know how too set these bikes up. anyway sorry forgot too say I've ordered a set of pipes off kenny tsa & over the coarse of the year will be sending barrels up to mick abbey i will then get it on a dyno but at the minute would like to use it as it is any help much appicated cheers pete  |
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Post by midlifecrisisrd on Jul 2, 2016 19:57:39 GMT 1
Can't remember what standard pilot size is but sounds big. 270 mains with no filter sounds small
Steve
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Post by muttsnuts on Jul 2, 2016 21:13:09 GMT 1
Pilots are too big, 25's would be better, mains sound a tad too small, maybe 290's would be better, have you checked to see if the carb's are balanced up as that could be the problem with the cutting in and out of one carb, is it always the same carb ?
Presumably it rev's cleanly when in neutral on the bench/stand, so is only doing it when under load e.g. being ridden ?
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Post by petehodges on Jul 2, 2016 23:38:01 GMT 1
Thanks for replys I'm going to try & have a go at balancing carbs tomorrow I did adjust one today thinking there was slack in the cable one side !
Oops perhaps that was not right yes mutts it revs cleanly in neutral yer when under load . What you reckon order up some new jets & stick them for a try ?
Keep it coming thanks lads
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Post by marsbar350 on Jul 2, 2016 23:45:48 GMT 1
pete
put a filter in it makes jetting a lot easier
clean the pilots and balance the carbs
make sure the PVs are in the right way
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Post by midlifecrisisrd on Jul 3, 2016 10:43:33 GMT 1
I'd also say fit a filter, drill the lid and panel under the filter if you like but it's no restriction
I'm getting upper 70''s hp with airbox and standard filter (lid drilled)
Steve
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Post by petehodges on Jul 3, 2016 15:52:51 GMT 1
Ok so I've rebalanced carbs today lollystick I think I've got that right just took it out for the starts runs fine first five minutes on lanes it felt real good then got down too main road she got up to 65 -70 then started dying back then it was 60 flat back down to one cylinder coming home ??😢
Would wrong jets or no air filter cause this ? Forgot too say coming home round lanes was on one then suddenly back too two pots Ideas please folks
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Post by midlifecrisisrd on Jul 3, 2016 16:04:36 GMT 1
If it's way rich on the pilot it will run till it gets warm as if on choke then struggle
Also did you do the float levels from the metal face or the gasket face.
It should be the metal face at the cut out.
Electrics can also cause problems as they heat up and fail but as u our car settings are suspect I'd deal with that issue first. After all everything but the coil is new
Steve
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Post by petehodges on Jul 3, 2016 16:23:33 GMT 1
Hi Steve thanks for replys
I had someone set up the carbs as I'm a bit clueless with them but it would never start so I doubt he ever got it far up the road ? For testing
I may just order some jets & pilots & air filter is it easy to set up these carbs as not sure how you measure them ? Ta
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Post by LC_BOTT on Jul 3, 2016 16:34:15 GMT 1
have you tried seeing what the fuel flow is like from the tap, and assume the fuel cap is venting ok, could it be one carb is running out of fuel, and then refilling when you slow down? can you check the PV's are opening ok, but not sure what effect this has on performance, when thrashing it along a road.
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Post by petehodges on Jul 3, 2016 17:07:56 GMT 1
Ok that's a good point mr bolt it has another fuel cap fitted a while ago now though
I must add I've fitted a set of Norbos banshee coils on & this would be the first time they're been used ? I may try another set too check there good
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Post by headcoats on Jul 3, 2016 20:29:36 GMT 1
Have these carbs been stripped and cleaned properly ? If not they will need an ultrasonic clean and all jets and airways blown through
Wet plugs could indicate not firing properly either |
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Post by spondon440 on Jul 3, 2016 20:59:20 GMT 1
Is your tank rusty and filling the carbs with rusty shit?
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Post by petehodges on Jul 3, 2016 22:08:00 GMT 1
Is your tank rusty and filling the carbs with rusty shit? Had already had this problem with carbs full of shit &trust so I've had a tank liner put in But good point I should really put a filter on carbs Pete |
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Post by petehodges on Jul 8, 2016 21:03:20 GMT 1
Well my jets & air filter have come so going to have another go at it tomorrow ,
Any advice on this I'm all ears 👍
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