Alexdukes Posted November 11, 2018 Report Share Posted November 11, 2018 Hi guys, I am new to bikes and have run into a problem! I purchased a second hand Gas Gas 125 pro 2003, evrything was good with the bike although there was a small issue with the clutch, i bleed the system, no real change so put it down to warped plates. Rode the bike this morning, no problems, went out again this afternoon, bike started fine, started riding down the road then the 2 strike sound suddenly got very loud! Now the bike won't start! Any ideas?? Thanks in advance for any help Quote Link to comment Share on other sites More sharing options...
wilson c Posted November 11, 2018 Report Share Posted November 11, 2018 has the bike been stood for a while ? this can cause all sorts of issues ,as for noise look at the exhaust but will run with it blowing . look for a spark at plug and have a look at carburettor they can get a bit messed up if left standing for a long time as little as a month in some cases Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 11, 2018 Report Share Posted November 11, 2018 What mix are you running with the fuel? Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 11, 2018 Author Report Share Posted November 11, 2018 Roughly 75ml oil to 5 litres of 98? Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 11, 2018 Author Report Share Posted November 11, 2018 I don't think the bike has been left for long? I have ridden it several times and not had an issue just this time round? Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 11, 2018 Author Report Share Posted November 11, 2018 Just spoken to my son, he said that he put the wrong fuel in, he just put in straight 98 unleaded that was meant for the ride on lawnmower! Is that the issue??? Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 11, 2018 Report Share Posted November 11, 2018 No oil! Yikes, the piston probably siezed. Pull the front exhaust pipe to get a peek at the piston and rings. Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 11, 2018 Author Report Share Posted November 11, 2018 What am i looking for? I can crank it, but making much more of a popping noise if that makes sense!?! Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 12, 2018 Report Share Posted November 12, 2018 The piston melted o to the rings. If you are lucky, just piston and rings. If you are unlucky you took out the rod. Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 12, 2018 Author Report Share Posted November 12, 2018 So, i have managed to remove the head, no discernable markings inside the bore, and piston seems ok and rings are intact but everything seemed to have quite a coating of oil on it? What does that mean? Rings and piston have gone? (Sorry a bit new to this!) The con rod seems ok aswell! Phew! Well i think it's ok! It's not in pieces at least! Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 13, 2018 Report Share Posted November 13, 2018 You have the head or the cylinder off? Usually if it seized the rings would be stuck to the piston. A picture would be good or have someone look at it. Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 13, 2018 Author Report Share Posted November 13, 2018 Some pics Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 13, 2018 Report Share Posted November 13, 2018 Looks like several things happened. It got hot and took out the orings on the head. Is that just carbon on the piston or metal flakes. The rings look barely stuck and I would be surprised if there is any chrome left in the bore. Quote Link to comment Share on other sites More sharing options...
Alexdukes Posted November 13, 2018 Author Report Share Posted November 13, 2018 It feels like grease/carbon. What's the next step? New piston and rings? Quote Link to comment Share on other sites More sharing options...
oni nou Posted November 13, 2018 Report Share Posted November 13, 2018 4 hours ago, Alexdukes said: It feels like grease/carbon. It is a Teflon [non stick] coated piston .....the fact it is still intact shows that it was a nearly new piston. Quote Link to comment Share on other sites More sharing options...
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