ksw390 Posted June 11, 2014 Report Share Posted June 11, 2014 I've never had this happen before. stopped by little sahara today on my way home and rode for about 2 hours. bike was running great At one point I stopped on the top of a dune and was watching a buggy. My buddy was riding with me and he got a few dunes in front of me while I was watching the buggy. I figured I should catch up so I kicked the bike give it some gas all of a sudden holy crap I'm going in reverse. Freaked me out it wouldn't go forward shifted gears and everything. I shut it off then started it again give it some gas now I'm back in forward. Cough up with him told him bike was running backwards. He didn't beleive me we didn't know they could do that. We rode for about one hr more then my bike started running like crap back firing badly on the low end so we started heading in. if I could get it to the power band and keep it there it would run. Made it back to the trailer shut it off. Took the flags off. he was standing there I started the bike to ride it in the trailer gave it some gas and wow I'm going backwards again he was trying to get his phone out to video when my bike went clunk and died. Tried to start it again and the kick start is broke now. Ok enough of the story so I looked on here about what could have caused it and seen alot of people say cdi and alot say timing. So I called the shop and ask what they thought i told him it does have an adjustable timing plate. he said it can't be timing. It would have to be so far out of time to do that that it really isn't possible. he said that somthing in the cdi is sapose to keep it from running backwards but they can fail. So i guess I'm probly gonna be replacing whatever broke and checking the timing plate just to be sure but should i replace the cdi as well. I don't want to spend 100s fixing it just for it to happen again Sent from my SAMSUNG-SM-N900A using Tapatalk Quote Link to comment Share on other sites More sharing options...
#1JUANstunna Posted June 11, 2014 Report Share Posted June 11, 2014 The cdi doesn't know which way the motor is running. Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted June 11, 2014 Report Share Posted June 11, 2014 Don't go back to that shop. Key can shear. Way out of time. Quote Link to comment Share on other sites More sharing options...
special06shee Posted June 11, 2014 Report Share Posted June 11, 2014 It is a bad cdi. Guy i know had a cheap china cdi and it did the same thing. Quote Link to comment Share on other sites More sharing options...
#1JUANstunna Posted June 11, 2014 Report Share Posted June 11, 2014 I agree the timing is whack and that is what is making the motor run backwards. Quote Link to comment Share on other sites More sharing options...
ksw390 Posted June 11, 2014 Author Report Share Posted June 11, 2014 That's why I put it out here but I won't call out this shop but let's just say they are a very reputable shop they do great work and know what there talking about moat of the time. He said there is small diode or somthing built into the cdi that is sapose to keep the bike from running backwards. I agree with #1 Juanstunna how can the cdi know but hey I don't build em I can't argue with the man who does this for a living and should know. Sent from my SAMSUNG-SM-N900A using Tapatalk Quote Link to comment Share on other sites More sharing options...
ksw390 Posted June 11, 2014 Author Report Share Posted June 11, 2014 Sheerider11 your right the key can shear but won't it not run at all when sheared Sent from my SAMSUNG-SM-N900A using Tapatalk Quote Link to comment Share on other sites More sharing options...
special06shee Posted June 11, 2014 Report Share Posted June 11, 2014 Pull the side cover and flywheel. It would take 10mins to see if there is a problem. If all looks well, borrow a OEM cdi from a buddy and try that. Quote Link to comment Share on other sites More sharing options...
#1JUANstunna Posted June 11, 2014 Report Share Posted June 11, 2014 If the key is sheared it can basically back fire and start running backwards or if it fires on TDC it can make it run backwards. Hmmm that needs a little more explaining but hopefully you get what I'm trying to say Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted June 11, 2014 Report Share Posted June 11, 2014 Sheerider11 your right the key can shear but won't it not run at all when sheared Sent from my SAMSUNG-SM-N900A using Tapatalk No it can run. If it only comes out a few degrees it's no different the moving the plate. If you get a huge turn out of it then yeah it won't run. Quote Link to comment Share on other sites More sharing options...
ksw390 Posted June 11, 2014 Author Report Share Posted June 11, 2014 Oh ill post what's wrong as soon as I find out lol but I'm sure it broke a gear on the kicker side I got no kick anymore. He told me that usually when this happens it can break the gear on the back of the clutch basket. Sent from my SAMSUNG-SM-N900A using Tapatalk Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted June 11, 2014 Report Share Posted June 11, 2014 Your CDI fires BOTH plugs at the same time. So your plug gets fired at nearly TDC and BDC. If your flywheel spun on the crank (Sheared or rolled the key. AKA "Took the key for a ride") it can trigger the plugs to fire at the halfway point. Depending on the location of the flywheel and piston when the bike shut off…..it can fire a 1/2 compressed charge and that will end up going down instead of all the way up. Now your motor is running backwards…….. Backwards is bad MmmmmmKay? Quote Link to comment Share on other sites More sharing options...
ksw390 Posted June 11, 2014 Author Report Share Posted June 11, 2014 Yeah its bad especially when it goes clunk and dies instantly Sent from my SAMSUNG-SM-N900A using Tapatalk Quote Link to comment Share on other sites More sharing options...
ksw390 Posted June 11, 2014 Author Report Share Posted June 11, 2014 So it doesn't madder witch wire is on either plug I always wondered about that Sent from my SAMSUNG-SM-N900A using Tapatalk Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted June 11, 2014 Report Share Posted June 11, 2014 So it doesn't madder witch wire is on either plug I always wondered about that Sent from my SAMSUNG-SM-N900A using Tapatalk nope. The cdi/coil dosent know. Just fires both. Takes the guess work out. Quote Link to comment Share on other sites More sharing options...
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