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Topics - Marty

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Odyssey FL250 / Tuning up a new FL250 Ody rebuild
« on: November 21, 2020, 04:42:05 PM »
Throwing out a bunch of new rebuild stuff.....   I have two odyssey's a 1983 and a 1979 both kept pretty original. Both engines have been bored up to .25 oversize. I have noticed both seem to drip a lot more oil around the exhaust then they originally did. Has anyone else done a rebuild bored up a size and experienced this? My uneducated guess is that with a larger bore it is able to pull more fuel/oil into the carb. I'm mixing at 32:1 with Amsoil dominator 2 stroke oil (it has a pretty low flash point). Open to any oil suggestions.
     Another thing I noticed the exhaust schematic show a circular cardboard gasket. Tried this but found it would not fit on the stock exhaust. A quick measurement showed why. The exhaust connector off the engine is about an 1 1/4" and the pipe that connects to it slides in about an 1 1/4" so there's really no room for it to fit. Curious what others are doing.
     The 1979 rebuild I was testing out today starts right up but hangs a while before dropping back to idle. Since this was vacuum/pressure tested and passed,  I tried spraying starter fluid around gasket, seals, carburetor but didn't notice any rpm increase. So took it out for a quick spin. This one is faster than the 83"!  Next problem is runs right until you try to go to wide open throttle - then immediately bogs. The 1983, same build, runs at all speeds. Both are run with non ethanol gas and carburetors have been rebuilt. I'm guessing I'll need to recheck the carb, maybe jets? Anyway if anyone can point me in the right direction I'd appreciate it. Sorry for the long post, Marty.

Odyssey FL250 / Leaving clutch off during initial startup/testing?
« on: October 20, 2020, 10:31:08 AM »
Hi guys, Finishing up a engine rebuild on a 250. I am wondering if I can leave the clutch off during the initial startup and testing? I know I can jack up the rear tires so it won't engage during testing but thought leaving it off might make it easier. Thanks for your input.

Odyssey FL250 / Crank Bearings on FL250
« on: February 15, 2020, 06:33:03 PM »
Looking for "Crank Bearing" replacements, searched through old posts and found:

Use good main bearings. Spend the extra $10. The cheap China bearings ain't no good. Don't use them. FL250 main
bearings are part # 6306.

On my first odyssey I ordered Fl250 (ebay) Nachi bearings and received 6306-C3 bearings (C3 meaning slightly more clearance than stock 6306 bearings)
Now ordering bearings for my 2nd odyssey. Would you recommend I get Stock 6306, 6306-C3 bearings or am I over thinking this and it doesn't really matter :-\

Anyone who's rebuilt there lower end feel free to chime in! Thanks, Marty.

Odyssey FL250 / Small oil leak after rebuild!
« on: November 27, 2019, 07:40:51 PM »
Super bummed:(.   I just finished a complete FL250 engine rebuild with new Nachi (made in Japan) bearings, good condition crankshaft and after pressure testing all seemed well. Unfortunately, now that I've got everything dialed in I noticed a small amount of oil getting passed the oil seal on the clutch side of the motor. I sprayed some carb cleaner but rpm's remained the same. I'm going to keep an eye on it, but with the kids over for Thanksgiving tomorrow it'll be getting some use. Could it be a bad (brand new) bearing? Crank?  I guess when I get time I should redo the pressure test. Oh well - Hope ya'll have a good Thanksgiving,   Marty.

Odyssey FL250 / FL250 Chain - reduction drive
« on: November 18, 2019, 05:37:36 PM »
As these are no longer available, what do you guys use. The originals were pressed with no master link. Do you guys have a source or make your own? Mine's about done:(

Odyssey FL250 / Fl250 What's UP?
« on: October 11, 2014, 10:55:46 PM »
Bighead, I'm going through the rebuild from Hell:(. but I'm very persistant. First problem: It's running rich (plug wet/ oiley). I can hold the spark plug while pulling the cord and do not need to let go of the plug? I tried my mower but the shock was huge. With that said I've had it running both slow and fast but oil splooge evident. I'm running amsoil interceptor 45: 1. (Bighead - I've rebuilt and adjusted - Carb,  new coil, spark plugs, pressure tested motor, replaced stator wires, checked ignition and pulse coils specs (close to manual), emailed Oddatv who sells coils on ebay, said they checked out, jumped wires from stator (ignition, pulse and ground wires directly to CDI (to bypass killswitch), but still weak spark maybe (Still runs).  Multimetered all ground wires for continuity, all good. Second problem: Carb overflow has gas dripping out of hose. I cleaned Fuel needle, adjusted float bowl to 22mm, tried another Fuel Tee, but at idle fuel slowly spits out. Tried an open Tee and of course no fuel leaked.  Was hoping the Tee pressure might be flooding the carb. Checked the spark plug but still wet with the open Tee:(. I will order a new check Tee valve, hope this solves the leak. Could this be wiring, stator ignition coil, cdi or holding plug while pulling and weak spark is normal??? Please help, Thanks Marty.

Odyssey FL250 / Stick tongue on Spark Plug and PULL!!!
« on: October 11, 2014, 09:43:31 PM »
Can anyone with an FL250 hold the spark plug in one hand and pull the cord without having to let go! I can. Don't get me wrong, I can feel a weak pulse but never enough that I need to release the spark plug? With that said, It starts up and I've rode slow and fast BUT - it runs very rich (wet, oily plug). Help please. Marty.

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