February 5, 200719 yr I`ve got a problem,which is ,my bike wont start when its hot.It keeps running all day,buy if i leave it stopped for 10mins or so,it wont go.I have a spark,got fuel in float bowl.I have noticed that when i try to kick it up,the plug is completly dry.This happened recently,so i took carb off,the jets were clear,i put the carb back on and it started firs kick.I`m pretty sure there is nothing else wrong.Seems like a fuel problem. Any ideas?? Cheers in advance
February 6, 200719 yr What type of fuel are you running? Do you have the long vent tubes installed? What jets? Billy, Twit! Edited February 6, 200719 yr by copemech
February 6, 200719 yr Pilot jet WAY too lean. Next time it happens pull the choke in to start, it will start and run rich, turn choke off. Test over with...... BillyT
February 6, 200719 yr Author Wont start with choke on!!.Got std jets in for UK use,(checked website),using 98 octane fuel.Bike has always run well prior to this happening. Whats this with the long vent tubes?? Cheers
February 6, 200719 yr Ok , here's my guess going by my previous experience: I think your bike is an 04 or 05 model?? and I think ??your stator coil is on the way out, 'cos that is exactly how my 04 played up. If you're lucky I am wrong.
February 6, 200719 yr Author Stator was renewed not 12 months ago,so i`m fairly sure this is not the cause. Cheers
February 6, 200719 yr hi im having nearly the same problems. mine is very hard to start then i read on tc that i was to use no throttle and it now starts about 3rd kick will not start after i stop it at each section and when i stopped for lunch i couldn't start it? i ahve read somewhere it could be the mixture screw? any one got any ideas?
February 6, 200719 yr Author I never use any throttle when starting.Maybe i`ve used the wrong fuel,i`l have to check.The mixture screw should be 3.5 turns out. PS,copmech,tell me about the vent tubes Cheers
February 7, 200719 yr If there is fuel trapped in the long vent tubes it can cause a negative pressure in the bowl preventing proper fuel flow through the pilot jet. This also causes a "floating" lean idle at times. Not to be confused with water in the carb having the same effect. I have been running short tubes only, primarilly to help prevent water/dirt entry when washing the bike. Otherwise the tubes do you no good it seems and many remove them entirely.
February 7, 200719 yr Mark.... Read: "then stopped for lunch and it wouldn't start at all until some guy helped me by turning the fuel off then kicked it few times then put fuel back on and gave it some choke and it started" The pilot jets are way too lean. Why do you think this is a twit answer? It has been proven on many occasions when a bike will not start when warm that the jet being lean messes it up. Pulling the choke in and the bike starting proves what I am saying.
February 7, 200719 yr Billy, I just cannot imagine how someone could run a pilot jet that lean. My '07 did come accross with a #30 installed, normal range for me here 33-36, it was soo weak it would not even lift the front wheel off tickover. Back to the shed after a 100ft test ride! Installed a 35 and it came to life.
February 8, 200719 yr Markus The jet itself may not be to small but rather the pilot circut blocked. Pulling in the choke an dthe bike starting helps determine if it is the pilot circut. If so then check jet size and/or pilot circut. Twit signing off for now
February 8, 200719 yr Billy, I have been running a mix of 93 pump gas and 100 octane avgas to get the neccary octane to prevent pinging. In the hot summer months I have to reduce the amount of avgas to prevent hard starting. It just does not handle the heat well, almost like a vaporlock!
February 8, 200719 yr Mark Does the bike pink when you let go of the throttle. When I rode your bike at Austin I mentioned to you that your bike was too lean on the pilot jet. Remember the little test I showed you with the throttle position at varous openings??? Let me know. Cheers BillyT
February 8, 200719 yr Billy, You rode it started off cold(quite cold), It improves when warmed up! And NO you did'nt say ****1! I have some reservations about the PHBL, yet without major alterations I have found that you can achieve a pretty smooth operation with just the pilot jet and airscrew if you run just a tad bit on the lean side. With the 35 pilot and 2 3/4 turns out on the fuel screw and needle in 3rd groove, there is a pretty good transition to the needle. With a 36 or larger, the transition gets blubbry! A slight pink when you chop the throttle does not bother me as you are cutting fuel off a that point. But only slight. Once again a tradeoff! I think Tom is still installing the 33's out of the box, and probably running 3 1/2 turns out. This gets to the very limits of the screws effective range which I also have a bit of problem with. The #35 will fatten up nicely if needed. Ryan is using a #38 on the pilot, full rich, they want max power, NOW! To hell with the rest of it! And lean on the top at a 115! for MAX power in the revs! The pros basically have two throttle positions on or off! I would like to play with the VHST a bit, just to see, but that is another project! In closing, the Dellorto does a job, that is all, and untill something better and cheaper comes along, well you know! my 2 c
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