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PostPosted: Thu Jun 22, 2006 6:23 pm
by uscgairdale
Last weekend I was able to finally get one of the KFMs running. Well, sort of. I could just bearly get it started and then I couldn't turn more than 2500 rpms before it became fuel starved. One thing lead to another and before I knew it the carb was all apart, the reed valve assembly was apart, and I staring at a rusted crank! I really really wanted to break something. You can see from the pictures that they have not been taken care of for quite some time.

Here's the test stand that I made. It's not pretty, but it works quite well.

Dave

PostPosted: Thu Jun 22, 2006 6:24 pm
by uscgairdale
Here's the carb..... Does anyone know what make and model it is? I think that it's a Dellroto, they were what was used on the 30 HP version.

Dave

PostPosted: Thu Jun 22, 2006 6:30 pm
by uscgairdale
Reed Valves....

PostPosted: Thu Jun 22, 2006 6:34 pm
by uscgairdale
How about this crankshaft! Trust me, I'll never buy anything sight unseen agian.

Dave

PostPosted: Thu Jun 22, 2006 6:38 pm
by JPXman
holy cow! caveat emptor for sure!

welcome to the world of rebuilding engines. The good news is that you can still probably get parts for these bad boys in the states from that dude in florida. rusty cranks can be shined up, new seals installed, new gaskets made, and then you're back in business.

What I'm finding as i rip apart the JPX engine further and further is that 2-stroke engines are really easy to rebuild. Once you get them all apart, cleaned, and new rubber/gaskets on hand, they go back together in about an hour!

Keep at it Dave, a good racing motorcycle shop can clean up that crank for you and split it and put in new bearings.

Tyler

PS: good work on the ruddervator bellcrank, looks pretty similar to that FEA analysis me and a buddy did on that exact same part ;)

PostPosted: Fri Jun 23, 2006 3:48 am
by ola
where did you buy those engines?.

ola.

PostPosted: Sat Jul 01, 2006 8:28 am
by uscgairdale
I'll just say that I did not buy them from a company or store. I'm working on replacement parts right now.

Dave

PostPosted: Sat Jul 01, 2006 3:13 pm
by ola
uscgairdale @ Jul 1 2006, 08:28 AM wrote: I'll just say that I did not buy them from a company or store. I'm working on replacement parts right now.

Dave


why dont you just contact the seller and tell him.half the mony back.

just specifie the bearings and sealings here and maby we can help you find it.

NEVER , buy a engine without photo from the the inside !.

ola.

PostPosted: Wed Jul 05, 2006 8:47 pm
by aroguetrader
Dave,

I can't help you with the crank, but I did find a used reed valve unit in my stash of extra parts. It's kind of grimmy, but otherwise looks to be ok...but I'm not sure how to evaluate its integrity...but it's nothing like that nasty mess you've got now.

It's yours if you want it....let me know.

John

PostPosted: Sat Jul 22, 2006 10:47 am
by uscgairdale
Thanks for the offer, John. Thank goodness that my reed valves are actually in excellent shape despite what the pictures show. I would still like to have some spare parts though. I'll send you a PM.

Dave