shercoman2k8 Posted November 15, 2008 Report Share Posted November 15, 2008 Hey all, Went to start my 06 sherco 125 earlier and found it started smoking quite badly! Over the past few rides I have noticed it sounds a bit rough, like a metallic noise and increasingly poor at starting! More on the starting Well, she will start fine from cold... Its when she's warm that I get the problems... but only if I stall it, when killed with the kill switch it will start right back up first kick but if stalled i can be sitting there for 5-10 mins with choke no throttle, no choke full throttle and every other combo imaginable! Is this a normal problem with these bikes on the stock carb? Anyway from today Kicked her over, started first kick, very smokey compared to normal so I thought "yeah, weve had a few frosts and maybe just needs run for a while"... went for a ride up the road and still the smoke didnt clear, for all of you that would probably ask the smoke was bluey grey. The bike then stalled (my fault) and wouldnt start. So, any of you guys know what could be up? Quote Link to comment Share on other sites More sharing options...
thundercat Posted November 15, 2008 Report Share Posted November 15, 2008 piston rings by the sounds of it, first thing i'd look at anyway. Quote Link to comment Share on other sites More sharing options...
shercoman2k8 Posted November 15, 2008 Author Report Share Posted November 15, 2008 Hard job? Quote Link to comment Share on other sites More sharing options...
stork955 Posted November 15, 2008 Report Share Posted November 15, 2008 Gday, check the compression before you pull the motor down, you may save yourself a bit of cash. Better still - Check all the easy usual things first - is the aircleaner element clean and not over-oiled? Did you accidentally add too much oil to the fuel? Has it fouled the spark plug? (Dry and Black looking). Is the exhaust system clean and free flowing? Is the carb nice and clean inside? Try these first. An 06 125 probably wont need rings yet, unless you ride it every day. HTH, Cheers, Stork Quote Link to comment Share on other sites More sharing options...
shercoman2k8 Posted November 15, 2008 Author Report Share Posted November 15, 2008 (edited) Any particular way to check the compression or would I notice quite a difference? The airfilter is fine, carb has been stripped down, cleaned, jets blown out. Hmmm about the fuel, I have left the jerrycan in the carport for a few nights by accident but its been like it for a while... Oil in the fuel is correct for sure. 80:1 fully synthetic using a measure bottle, cant be that far wrong. Do ride everyday with trials most weekends, riding the A-line so bike does get slightly hammered! Will check plug tommorow though:) Any more possibilities? Cheers Jamie Edited November 15, 2008 by shercoman2k8 Quote Link to comment Share on other sites More sharing options...
stork955 Posted November 16, 2008 Report Share Posted November 16, 2008 Gday - to check compression it is best done with the engine warm. Use a compression tester (a car one will do on these) in the spark plug hole and make sure the plug is in the lead and tucked well away from the open hole. Open the throttle fully and kick several times until the needle stops moving. You should see better than about 100 PSI if its OK. If thats all OK you may have bigger problems. Try to describe the noise in more detail if you can - and if it is different when hot or cold, does it alter with engine speed or load etc. Cheers, Stork. Quote Link to comment Share on other sites More sharing options...
max1956bikes Posted November 16, 2008 Report Share Posted November 16, 2008 it sounds like main bearings to me.allowing the main seals to suck in gearbox oil. Quote Link to comment Share on other sites More sharing options...
stork955 Posted November 16, 2008 Report Share Posted November 16, 2008 (edited) Thats what I was thinking, but didnt want to say that yet... - check the gear oil level to see if it has dropped. Have the Sherco's got a sight glass? Cheers, Stork. Edited November 16, 2008 by Stork955 Quote Link to comment Share on other sites More sharing options...
shercoman2k8 Posted November 17, 2008 Author Report Share Posted November 17, 2008 The noise sounds like a coin dropping on a tin roof but slightly quieter, does alter with throttle slightly! Gearbox oil is fine, although I doubt the main bearings gone already... my 01 was still in top shape without any engine maintenance apart from 1lot rings in 7 years. Compression was 104psi so thats alright. I did notice a small hole in the top of the clutchcase, could this be anything to do with my smokey problem? Quote Link to comment Share on other sites More sharing options...
stork955 Posted November 17, 2008 Report Share Posted November 17, 2008 Gday. I tend to agree, your bike is not that old so it is unlikely that the bottom end is tired, however dont rule it out. You can remove the stator and have a look at the end of the crank for a buildup of dirt/rubbish around the seal face. This often happens when a seal or bearings fail. Also have a feel of the crank to see if it has any up and down playor roughness while rotating. There should be zero. As to the hole in the cover - I dont know. Perhaps someone with a better knowledge of these bikes will chime in! It may well pay to have someone check your bike out (a local mechanic) rather than doing any long term major damage. Even if just for peace of mind. I'm just wondering if the noise you hear is pinging, this is likely if there is a buildup of carbon on the piston crown and the head. Its not hard to whip the head off and have a look. With 2 strokes, cleaner is better and excessive smoke always leads to a buildup in the combustion chamber and exhaust pipe over time. Cheers, Stork Quote Link to comment Share on other sites More sharing options...
shercoman2k8 Posted November 17, 2008 Author Report Share Posted November 17, 2008 Right, Ive found out what the noise is, stupid me... Kickstart against the frontpipe just vibrating, I reckon the smoke could just be caused by the fuel mix screw set wrong and/or LOADS of carbon in the pipe so this weekend im gonna give it a blast up the forestry tracks for an hour or two, just try clear it out, then im gonna try a new plug and filter! If none of this works the head shall be coming off! Quote Link to comment Share on other sites More sharing options...
copemech Posted November 18, 2008 Report Share Posted November 18, 2008 Right, Ive found out what the noise is, stupid me... Kickstart against the frontpipe just vibrating, I reckon the smoke could just be caused by the fuel mix screw set wrong and/or LOADS of carbon in the pipe so this weekend im gonna give it a blast up the forestry tracks for an hour or two, just try clear it out, then im gonna try a new plug and filter! If none of this works the head shall be coming off! In my days of youth, you would be smoking some bad stuff! Quote Link to comment Share on other sites More sharing options...
stork955 Posted November 18, 2008 Report Share Posted November 18, 2008 Right, Ive found out what the noise is, stupid me... Kickstart against the frontpipe just vibrating, I reckon the smoke could just be caused by the fuel mix screw set wrong and/or LOADS of carbon in the pipe so this weekend im gonna give it a blast up the forestry tracks for an hour or two, just try clear it out, then im gonna try a new plug and filter! If none of this works the head shall be coming off! Getting somewhere now :-) Exhaust first! - dont pull the head unless you really need to. Clean the exhaust, it'll need it. Dont change your mixture screw if it runs OK (apart from what we know) as it will not affect smoking anyway. Fresh fuel might help too. Always stick to the easy stuff first. Let us know how it goes. Cheers, Stork Quote Link to comment Share on other sites More sharing options...
shercoman2k8 Posted November 18, 2008 Author Report Share Posted November 18, 2008 Will update saturday evening after a good blast! Quote Link to comment Share on other sites More sharing options...
shercoman2k8 Posted November 23, 2008 Author Report Share Posted November 23, 2008 (edited) Sorted, took it for a 3 hour, full speed blast up the forestry tracks...shook it loose and burned it off. Thanks guys, also put a spacer on the kicker to stop rattling Edited November 23, 2008 by shercoman2k8 Quote Link to comment Share on other sites More sharing options...
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