Guest Posted November 24, 2013 Share Posted November 24, 2013 Hey guys. I know this is to do with a motor cross bike, but I'm stuck.It's a honda crf 250..The main long bolt that mounts the swing arm in place has seized . And as I can't get it out, I cannot remove the engine, as it runs directly thru the rear of the engine.It's a thread less bolt but it will not come out, even after hitting it as hard as I can with a hammer to push it through.Cheers Quote Link to comment Share on other sites More sharing options...
bex Posted November 24, 2013 Share Posted November 24, 2013 is there a bolt head you could put a socket on? if so i would try getting it to turn, lots of lubricant soaking in and torque wrench with a long leverage. if you can get it to turn you can get it out. Quote Link to comment Share on other sites More sharing options...
Bogof Posted November 24, 2013 Share Posted November 24, 2013 It's a honda crf 250..The main long bolt that mounts the swing arm in place has seized Cheers Take it to a workshop and get it pressed out, or...Heat the area and hammer it out, or...Soak it in lots of WD40 or similar and hit it hard, or...Drill it and grind it out and fit a new one. Quote Link to comment Share on other sites More sharing options...
Tankbag Posted November 24, 2013 Share Posted November 24, 2013 Plusgas dismantling fluid is good stuff along with the advice abovehttp://www.tooled-up.com/product/plusga ... tAodG30AxQ Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted November 24, 2013 Share Posted November 24, 2013 it will be seized where the steel passes through the alloy of the crank cases they always do due to the reaction of the steel and alloy night mare job to do plenty of plus gas and also diesel sometiems helps in cases like this lay bike on its side so where the pivot bolt sits in it acts as a cup for the fluid to sit in and slowly soak into the bolt area Quote Link to comment Share on other sites More sharing options...
Chrissb6 Posted November 24, 2013 Share Posted November 24, 2013 Hi, drop the engine oil lay the bike on it's side and soak the seized bolt in plus gas or equivalent keep it well soaked. From what l've read they can be a nightmare to get out it might take a day or so to soak it through and still be one hell of a fight. Where steel passes through aluminium be sure to keep it well greased. Don't go crazy with the hammer l think that bolt passes through the rear of the engine casing. Patients my friend. Quote Link to comment Share on other sites More sharing options...
bex Posted November 24, 2013 Share Posted November 24, 2013 if after all the above fails, have you got a way to cool the bolt and heat the frame? baring that, throw away and start again with a bigger better bike pmsl Quote Link to comment Share on other sites More sharing options...
megawatt Posted November 24, 2013 Share Posted November 24, 2013 What is a threadless bolt? Quote Link to comment Share on other sites More sharing options...
Stu Posted November 24, 2013 Share Posted November 24, 2013 What is a threadless bolt? it has a long shaft and is only threaded at the end Quote Link to comment Share on other sites More sharing options...
megawatt Posted November 25, 2013 Share Posted November 25, 2013 So not a threadless bolt then ? Quote Link to comment Share on other sites More sharing options...
Guest Posted November 25, 2013 Share Posted November 25, 2013 cheers for all your post's guysSadly i left it laying on its side all night with basically quarter can of WD40 soaked into it..Still nothing..Ive battered it so hard with a steel rod and a hammer, than ive expanded the end of the bolt, so now mr grinder is needed Ive sent it to work with my partners father today to get it pressed out. Cant wait to get this done.Can finally move on to the task in hand... Big end siezed Too high compression from where it just been re-bored...cheers Quote Link to comment Share on other sites More sharing options...
Chrissb6 Posted November 25, 2013 Share Posted November 25, 2013 cheers for all your post's guysSadly i left it laying on its side all night with basically quarter can of WD40 soaked into it..Still nothing..Ive battered it so hard with a steel rod and a hammer, than ive expanded the end of the bolt, so now mr grinder is needed Ive sent it to work with my partners father today to get it pressed out. Cant wait to get this done.Can finally move on to the task in hand... Big end siezed Too high compression from where it just been re-bored...cheersHi ya WD40 is not really a releasing agent, here's some info that might be of use http://www.v8register.net/subpages/tech ... penoil.htm Quote Link to comment Share on other sites More sharing options...
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