Done something seriously stupid - I unwittingly left fuel in my raptor 30 v2 the other day (4 days ago). When i went to start it last night the torque statrer wouldnt have any of it. It turns out the piston had stuck (seized). I undid the housing and gave it a very light tap which freed it up. The engine now starts fine, idles good, revs up ok. However, once i put aload on the engine it seems gutless, and takes almost top stick position to hover/fly etc. Smokes alot as well. I changed the glow plug- seems like plenty of fuel is getting into engine. Is there any reasons for this behaviour other than the engine being damaged!!! Please help.

Sounds like it was hydro locked, removing the glow plug and spinning the excess fuel out should have been fine. If you are running synthetic oil it shouldnt be any problem, if you are using something with castor in it you might want to open it up and see if you have it gummed up, fresh fuel should flush it out if you do.

Also might want to pop the piston out and see that you didnt damage a ring or the rod or something and that the fan is tight and not allowing the crank shaft to rub on the backplate.

if your fuel seized a piston after only 4 days it sounds like it's castor oil based and you've most likely got a good build up inside the engine that needs to be cleaned off as it's causing fuel mixture problems and excessive friction.

kc

I use a fuel called 'cool power' 15 %. Not sure on what lubricant. I obvioulsy need to examine it further but whilst stuck at work i thought id do a bit of back ground. I took the glow plug out (renewed it)and it was still stuck - thats why i had to take the back plate off and give it a nudge. I wondered if there was any other obvious reasons for a lack of power other than a ruined piston ring etc. Also, is excessive white smoke symptomatic of a knackered ring/sleeve. The engine is a tt39.

Oh its a TT engine, get an os, you will be much happier.

Seriously though, take a look at the back plate for scrapes. If the fan loosens it can give you up/down play in the crank shaft. Usually it won't spin at all but if its just a little loose it will drag on the backplate and cause what appear to be tuning problems.

Cool Power has synthetic oil, no worries there.

Thanks barracudahockey. Had a look at the engine last night. There is no apparent damage or debris in the engine (took the muffler off and had a look at the ring). The back plate does have some very light scratches on though. I'll have to do some further investigation soon. I am a bit concerned about the amount of compression when i take the plug out and put my finger over the hole (compared to an older engine i have sitting around). I know this isnt very scientific - but needs further investigation. I will probably change all fuel lines to rule this out also and see if the fan needs tightening - then go from there.

best regards

syd

Are you sure didn't change the mixture settings in an attemt to get the engine started? Sounds rich.

I may have changed the settings a bit, but i find the tt very susceptible to climatic change anyway. I leaned it out more than i ever have and it still smoked quite a bit. I'll get it out soon and check it thoroughly b4 having to decide whether to strip the engine. Really dont want to and its probably not cost effective. However, ive chucked soooo much money at this recently ive got to try.

I only said that because you described a rich running engine. I still don't know how leaving fuel in the tank can cause that to happen.