Damaged Crankcase Repair With JB Weld: RM125 Project

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The first order of business for this new RM125 project is to repair the damage to the crankcase. I could have spent more money and bought another left side crankcase cover, but I am broke and already have a lot that needs to be replaced, so I went with the JB Weld option. I am pretty happy with the results and honestly believe it is going to hold up very well!
JB Weld Steel Stick: (bit.ly/2RtBrhQ)
JB Weld Original: (bit.ly/2TmZz2S)
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31 дек 2018

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Комментарии : 36

@orangestoneface 4 года назад

so the video is a two stroke engine l see, in the exhaut housing the creac crack is. wondering if some non tig like epoxy will work or is it too hot or will move and leak , rtv silicone, or metal brazing for alu, or jb weld takes some more heat is epoxy too but not much more l guess. some plate over it with screws into block maybe to push down on repair. exhaust muffler repair putty maybe.for two stroke housing crack. small scooter fifty cc. or smaller. crack on pressurised housing , does it have much prssure anyway. dont know .

@804_false_society5 5 лет назад

so i am working a sp200 and has a hole in the crank case how well dose this hold?

@collinbanter7702 5 лет назад

Sorry for such a late reply! If you prep it well enough it should hold just fine. JB Weld is some awesome stuff. Have not put the engine together yet.

@nikosatsaves3141 2 года назад

Ive bought a dirt bike that has been already jbwelded in the usual suspect spot:the oil drain plug.is it safe to try unscrew the plug or the whole thing is gonna crack wide open?

@themotobarn702 2 года назад

I would find out exactly where the crack is and how large it is first. That means you may need to grind down some of the jb weld. Either way, just take your time and be careful. You'll have to change the oil eventually.

@nikosatsaves3141 2 года назад

@@themotobarn702 you nailed it but i not gonna go digging in advance! I ll take my chances unscrewing first. No harm in that, right?? 😁😁

@Summertime_lover 4 года назад

Which weld do I use do I need to use aluminium stuff or is the steel weld fine

@jesusislord7254 2 года назад

hey

@panza. 2 года назад

You need same material as you are welding.

@academyofnaturaljustice8939 Год назад

JB weld will do all metals. It's a mouldable adhesive putty.

@Uneke 5 месяцев назад

Have the same issue Was gonna just cast a new one… this actually hold up?

@themotobarn702 5 месяцев назад

Sorry for the late reply. I never got to find out, as I sold the cases. I believe the guy still used them. However, if it were me again, I'd get them properly tig welded.

@ghostfromdeadmenatseawilli2248 4 года назад

Why not get new one

@jonnyprojects9875 5 лет назад

Did you ever get to test the bike to see how it held up got the same problem on a cr im working on tia

@collinbanter7702 5 лет назад

I have not put the engine together yet. I have all the parts now, I just have to spend the time and put it all together. I believe it'll hold just fine.

@orangestoneface 4 года назад

@@collinbanter7702 but the exhaust heat, jb can take how much 250 celcius then what melts or something

@jesusislord7254 2 года назад

question will a big break in the cover cost low compression???

@themotobarn702 2 года назад

If you have a crack in the actual crankshaft chamber of the crankcase then that will cause a massive air leak and cause all sorts of issues.

@jesusislord7254 2 года назад

@@themotobarn702 only the right crankcase cover in mycase... when I was riding air blowed it open 😪 I'm still confused to why it happened now I have no compression and a broken case

@themotobarn702 2 года назад

@@jesusislord7254 sorry man, that really sucks! I hope you can bring it back to life.

@jesusislord7254 2 года назад

if my sparkplugs are bad I won't be able to bumpstart right? bike rolling over just won't start even if I try push starting

@elmerfudd835 11 месяцев назад

Used 2 coats of jb on crankcase and the weld broke before even getting close to torque specs

@themotobarn702 11 месяцев назад

Well that sucks! Was it in the same area or a bit different? I have since had crankcases repaired by actual tig welding.

@madmaxmotovlog7342 3 года назад

Seems to be a trend breaking that mount off :/ Edit: my lower case saver blew clean off. Realized you were working in a different spot

@madmaxmotovlog7342 3 года назад

In any case, I cleaned the area with acetone, JB welded it and then covered it with asc all metal filler. Wiping down excess and rubbing flush. The break was almost undetectable

@jesusislord7254 2 года назад

question I have a big break in my transmission cover on my crd450 I was wondering if thats the cost for my low compression? what u think

@madmaxmotovlog7342 2 года назад

@@jesusislord7254 no a hole in the bottom end will not cause a loss of compression.

@jesusislord7254 2 года назад

@@madmaxmotovlog7342 wow I can't bump start or kick because of this issue 😤 last thing I wanna do is carry to the shop

@madmaxmotovlog7342 2 года назад

@@jesusislord7254 first try pouring a little oil I into the cylinder through the spark plug hole. Then do a compression test. If your compression is better then you need new piston/rings. If not then you should check your valve clearances next