exSRAaron Posted October 30, 2008 Report Share Posted October 30, 2008 (edited) Just wondering if you can un-seize (he said the crank is seized) and rebuild a dirtbike motor. It's a '00 XR100 4 stroke. I dont know much about dirt bike motors so I thought I'd ask you guys...any advice is appreciated thanks.Aaron Edited October 30, 2008 by exSRAaron Quote Link to comment Share on other sites More sharing options...
yotaman88210 Posted October 30, 2008 Report Share Posted October 30, 2008 How much? Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 30, 2008 Author Report Share Posted October 30, 2008 How much?200 for the whole bike with title. Quote Link to comment Share on other sites More sharing options...
yotaman88210 Posted October 30, 2008 Report Share Posted October 30, 2008 I hate you Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 30, 2008 Author Report Share Posted October 30, 2008 Quote Link to comment Share on other sites More sharing options...
flounder Posted October 30, 2008 Report Share Posted October 30, 2008 There is no telling what all is wrong with until you tear it apart.. Why does he think its the crank... It may be something not nearly as bad or something worse then what he thinks Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 30, 2008 Author Report Share Posted October 30, 2008 There is no telling what all is wrong with until you tear it apart.. Why does he think its the crank... It may be something not nearly as bad or something worse then what he thinksHonestly I'm not sure...he said it seized this summer and he doesnt wanna mess with it. Quote Link to comment Share on other sites More sharing options...
Kip Drordy Posted October 30, 2008 Report Share Posted October 30, 2008 Honestly I'm not sure...he said it seized this summer and he doesnt wanna mess with it.Why would it seize? Was he running it w/o oil or something? It's pretty hard to get the engine hot enough to seize the pistons. Quote Link to comment Share on other sites More sharing options...
Dweezel Posted October 30, 2008 Report Share Posted October 30, 2008 more often than not it's rings/piston sized in the bore, there usually isn't enough friction in the journals to stop a motor. Your prob looking at a whole new motor. Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted October 30, 2008 Report Share Posted October 30, 2008 Or, it could have split the crank. That'll seize the motor...XR/CRF 100s are bullet proof. I know, I owned one and ran the living piss out of it and ran it under severe conditions. They'll hold up if maintained.He didn't. apparently. I'd say the motor's toast and you'll be looking at probably $500 to get anew one and more than that to rebuild the seized one.In other words, $200 sounds fair enough, but realize you can buy one for about $1000. You'd save maybe $300 at the end. And then there's the whole what your labor is worth.My suggestion? Buy it and tear it open. Lord knows you won't hurt it any. Might be something easy. Most likely it isn't just rings... It's a piston failure where it could be valves are toasted, piston is busted in there, rod broke, crank broke - etc., etc. Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted October 30, 2008 Report Share Posted October 30, 2008 Here's a 96 - they're the same:http://cgi.ebay.com/ebaymotors/HONDA-MOTOR-ENGINE-1996-100-XR100-XR-100-80-crf_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el1116QQitemZ230300384168That's really cheap - here's a typical cost on one:http://cgi.ebay.com/ebaymotors/HONDA-XR100-XR-100-80-CRF100-MOTOR-ENGINE-92-08-04_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1205Q7c39Q3a1Q7c66Q3a2Q7c65Q3a12Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem110301023227QQitemZ110301023227Probably get a 2000 or close year one for about $500 like I said... Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted October 30, 2008 Report Share Posted October 30, 2008 Here's a running one and at a price that is about average:http://cgi.ebay.com/ebaymotors/Motorcycles___Honda-xr-100_W0QQitemZ200268533373QQddnZMotorcyclesQQddiZ2283QQcmdZViewItem?hash=item200268533373&_trkparms=72%3A1187%7C39%3A1%7C65%3A12%7C240%3A1318&_trksid=p4506.c0.m245So, you'd pay $200 for the non running one and $500 for a running motor. I'd pass now that I have looked at it... Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 30, 2008 Author Report Share Posted October 30, 2008 thanks lizard...I really only need a motor but he said he'd sell the whole thing for 200, i havent tried offering less or anything yet. But if you think the motor is a total lose then ill prolly pass on it and keep looking..basically I'm going to very likely swap in a XR100 motor into my NSR50. Like Brian did! Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted October 30, 2008 Report Share Posted October 30, 2008 thanks lizard...I really only need a motor but he said he'd sell the whole thing for 200, i havent tried offering less or anything yet. But if you think the motor is a total lose then ill prolly pass on it and keep looking..basically I'm going to very likely swap in a XR100 motor into my NSR50. Like Brian did!If you were buying it for the motor, I would definately pass on it...As for the NSR swap, why not the 150? Or, a TTR 125 motor. Better choices as the XR motor is very heavy compared to HP it puts out. Hell, wanna do something really cool? Do the CRF150 MX motor or do an 85 CR motor... That would put ya ahead of the mini guys! Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 30, 2008 Author Report Share Posted October 30, 2008 Well I wanna be able to race in both F2 and F3 classes next season. And the limit for F3 is 100cc 4 stroke I believe..i like 4 stroke power a little more im lazy Quote Link to comment Share on other sites More sharing options...
flounder Posted October 31, 2008 Report Share Posted October 31, 2008 (edited) Just an FYI.. If he did something similar to what happened to me, then he may think its the motor when its just the transmission. I scalded a gear to the axle shaft and it acted the a similar way as what a seized motor would... If he doesnt know engines all that well then he may not have an idea of what actually happened Edited October 31, 2008 by flounder Quote Link to comment Share on other sites More sharing options...
f4isvt Posted October 31, 2008 Report Share Posted October 31, 2008 Depending on what happened he could have flash welded the piston to the wall and then you looking at some quality time on a cnc machine. Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 31, 2008 Author Report Share Posted October 31, 2008 yeah looks like I'll keep searchin'...keep ur eyes out for a XR motor Quote Link to comment Share on other sites More sharing options...
rockybalboa Posted October 31, 2008 Report Share Posted October 31, 2008 One word of advice when it comes to displacement limits LIE.Hell put crf450 motor in it.Just tell them its a crf50.That 4 isnt important anyways. Quote Link to comment Share on other sites More sharing options...
Dweezel Posted October 31, 2008 Report Share Posted October 31, 2008 or just throw a decimal in there, like 45.0 Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 31, 2008 Author Report Share Posted October 31, 2008 Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted October 31, 2008 Report Share Posted October 31, 2008 Well I wanna be able to race in both F2 and F3 classes next season. And the limit for F3 is 100cc 4 stroke I believe..i like 4 stroke power a little more im lazyWhat, they tear you down? Doubtful most of those guys even bring the proper tools to do such a thing let alone spec your engine for size...I'd run a 150 4 stroke and call it a day. Quote Link to comment Share on other sites More sharing options...
exSRAaron Posted October 31, 2008 Author Report Share Posted October 31, 2008 i would feel bad if i got booted for cheating against 13 yr olds.. Quote Link to comment Share on other sites More sharing options...
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