why will it not start with choke

the bike sounds very rich. what year is it and what have you done to it?

regards

Taffy

Have you replaced the spark plug? Which carb do you have? On my 02 fx470 the choke circuit was all gummed up from old gas. I pulled the carb and cleaned it up and the bike started a lot better.

My 470 fc only starts on the choke if its about 2 celcius or colder but will start on the choke with the electric starter then runs for a few seconds then stalls i kick the bike with the choke on twice to three times turn it off then the bike goes and idles just about straight away the jetting is std float right i have replaced the needle and slide and it has made no difference to the starting but runs a little lean with the new needle i have adjusted the mixture srew and has made no difference to the starting it starts first to third kick when hot or if the bike has been on its side so ive stopped worrying about it as long as i know how to start it who cares

i really don't miss all this c***. there doesn't seem anywhere to put it up as it touches on ignition timing, carb, tappets etc etc. but i start mine now, 4 racing seasons later: in two kicks.

i wouldn't put it down to anything in particular but tappets DID make a difference, ignition timing change seemed to do nothing and even the FCR did nothing at first because i had to start the jetting from scratch.

...but that's where i am now.

i would always suggest to any dell orto owner to try a different choke jet. you need the revs to soar a little upon starting. these will then fall gradually as the engine warms and eventually you should hear the 8-stroke death rattle. if that is after about a minute, well then by turning the choke in you're ready to keep the engine alive on the usual fuel circuit.

i couldn't go through life doing all the shyte you lot do without having a go at changing choke jets. i mean, for the sake of $5... you know....

here is a copy of the thread i did on this subject:


i thought i'd start this post to help all you numpties that can't get a handle on starting your bikes.

most of you won't have sat and thought about this before but after you have read this i hope you'll get your shoot together and put some BRAIN POWER into it!!!

having modified carbs for years i have found that every change at the lower end of the jetting has created a problem or change elsewhere.

the dell orto carb has a choke jet that can get bunged up-especially if the carb and steed haven't been used for a couple of months. it will need cleaning out and should be held up to the light. the hole should be quite large and the trouble is that after cleaniung it may be no better. at least .5mm wide is how it should look.

the jet sizes on the keihin are actually basically only a metric drill size so a 180MJ is 1.8mm. that doesn't though make it smart to go round drilling jets!

the important thing is to LISTEN TO THE ENGINE. this is something that few people do. they bitch coz it doesn't start yet the engine is trying to tell them something!

the reason we have fun with carbs is because it's the LAST thing we fettle. everything else is set and the carb REACTS TO THE ENGINE. and that is the fascination and why it is so hard to help people.

this is what i look for when i start a bike;

lean on choke
the bike is a bitch to start and takes 30 kicks. each time it starts it runs a little longer until after 5 minutes it runs fine. it probably now doesn't like any throttle!

slightly lean on choke
the bike starts and judders for anything up to 10 seconds before it build up revs and builds up revs then revs like an idiot compared to starting! this bike will never 8-stroke and you can go to the loo/tog up ready, lock the garage - the lot-it ain't gonna stall!

spot-on
bike runs at medium high revs for at least 30-40 seconds before starting to 8-stroke mildly. it should run straight away at high revs and not build up. the revs should stay the same for over a minute before perhaps 8-stroking mildly and losing revs-it shouldn't stall. it shouldn't 8-stroke any sooner.

slightly rich on choke
bike starts well everytime but you need to blip the throttle or the revs might drop and it might stall. you have to be near the machine! 8-strokes within 10 seconds.

rich on choke
bike starts fine but within 1, 2 or 3 seconds it 8-strokes.

on the keihin carb even the MJ affects starting-seriously! so every mod you make has a knock on effect.

different choke jets are available from yamaha but you can't get them from keihin themselves for some reason (well it used to be like that!) so yamaha are the boys!

i have several choke jets and i used to always be swopping them out. everytime you change the needle straight (very last suffix letter) you will effect the starting. the PJ is only a small part compared to the needle straight. i have estimated it to be 80%/20% needle straight to PJ effect on starting with the FCR.

with the dell ortos the starting is really just the effect of the choke jet combined with the slide cutaway and PJ. that's why it's a lot harder to understand but not necassarily a problem in itself.

so next time listen to your engine!!!!

regards

Taffy

this was the thread named choke

regards

Taffy

Please tell this noob what "8 stroke" means, I have never heard this term before.

Thanks.

When a four stroke engine sounds like it fires every second power stroke,usually brought on by a rich carb condition it is referred to as 8 stroking....nsman

SOL:

I don't think Edlebrock still makes the Quicksilver or Quicksilver II carburetor which by the way was a descendent of the Lectron carburetor.

They do make what they call a Performer but no application for a Husaberg is listed.



If it were me I would stick with the Dell and get it set up (jetted) properly. Taffy knows what he is talking about when it comes to these vergassers

yeh i've got one

don't throw good money after bad!

now then, we used to have a member here called dwight rudder and he ran an edelbrock carb.

the man is a multi national USA champion which means as usual you ain't gonna listen!

he's over on TT now and again and if you don't get him there you can get him on the aerodrome.com as he-like me-likes his WW1 aircraft.

he set it up.

i think you made a mistake but hell, develop it and we'll put the figures up in the doc for ya!

can't say fairer than that!

BTW his name here was husawannabe.

regards

Taffy

Dwight Rudder ( 7x ISDT/E medalist and 8x AMA Natl Enduro Champ) moderates the "Off Road Riding Technique" forum at TT

Off-Road Riding Technique

I read your post with interest, as I experienced a similar problem with my Dellorto 38 round slide. The choke jet was too large, or drilled out, but you could only use the choke to prime the motor; if you started it with the choke on it would load up immediately as you searched for the abominable lever to flip it off. Then you had to kick a lot to get it to refire and maybe it would start or you might have to prime it and start all over. Not being able to get a new jet were I was at the time, I ran the fine piece of wire in the jet to reduce the size and now it's perfect. You may have two problems. Maybe a clogged pilot jet or dirt or something. Anyway I recommend following some of the advice given by Taffy and others. The temptation of just replacing a carb is strong; You'll still have to sort out that one, too. There's no "easy button" on carb science, but when you do finally get it right then you've learned something that you can apply to any motorcycle on the stinkin' planet. It's more satisfying than just replacment, and cheaper, too. Listen to Taffy; he's grumpy and he's English, but he's been there and has seen a lot. Good Luck, CC