New subaru questions

Discussion in '4-Stroke Engines' started by BigDaddyT, Aug 19, 2008.

  1. BigDaddyT

    BigDaddyT Member

    I got my staton with eho35. Been having a lot of fun with it. I have noticed 2 problems. After pulling a long hill at full throttle it will stumble or miss. I let off the throttle for a few seconds and the stumble goes away. I thought maybe vacuum so I removed the fuel cap and repeated and it stumbled again. Any thoughts?
    I have fuel in my oil. I smelled fuel on the dipstick so I stuck a lighter to it and it flashed. Im going to change to synthetic since my break in is over. What would be causes of fuel in the oil on a new engine. I know on new two strokes they are jetted rich but I dont have any experience with little 4 strokes.
     

  2. psmcd

    psmcd Member

    fuel in oil

    I also suspect fuel in the oil of my new RS 35. It was getting a slight dark discoloration within the first 3 tanks. It seemed to be running rich with a little sputtering at idle. I'm at 5,000ft altitude. I pulled the aircleaner and found and removed a thick paper element under the foam element. This allowed smoother idle and more response through the rpm range. But it still appears I'm collecting a bit of fuel in the oil. Anyone know of smaller jets or other way to lean out these carbs?
     
  3. Mountainman

    Mountainman Active Member

    If we go to the Subaru web site or send an e-mail to

    Gerald Pitts
    gpitts@RobinAmerica.com

    your answer will soon be on it's way.

    I thought about removing the thick paper element from my carb and just using the foam - because - it's getting a little wet with gas - but - left it in there for now.. I did cut down on the amount of primes used.

    Happy Rididng from - Mountainman
     
  4. BigDaddyT

    BigDaddyT Member

    The paper element had a tiny bit of fuel on it. I brought the bike inside last night and took the oil cap off. I might be delusional but I thought that the fuel would evaporate out of the oil. Ill check in a bit and see if it worked.
     
  5. Mountainman

    Mountainman Active Member

    Hey BigDaddyT -- might just want to start over with some new oil - keeping an eye on it. It's not common to be having gas go into the gear oil - unless - possible broken or didn't seat right RING ?? Ride That Thing - Mountainman
     
  6. BigDaddyT

    BigDaddyT Member

    Yeah in my 3 dozen vehicles only one had fuel in the oil and the carb was straight dumping fuel in the intake and straight washed out the rings. Fuel in the oil is very detrimental to engine life.
     
  7. psmcd

    psmcd Member

    oil chg

    Yea, I'm changing my oil before more rides to see what's happening. Thanks Mtn Man for the Subaru contact. I want info on jetting.

    Never heard nor seen a weed-eater owner concerned about break-ins.

    I've been religious about break-ins my entire internal combustion career but also had a motor seize mid air to my detriment (tapered bore) so must confess to being a bit jaded at this point - I just want to ride.
     
  8. BigDaddyT

    BigDaddyT Member

    Yeah im surprised not to see more infoz on break ins and such on here. I rode about 8 miles today then changed my oil. I have about 10 hours in it in all. I tried flipping it upside down to drain the oil and that was inneffective. Protip:I had a friend come hold the oil catch bucket, i locked up the front brake and stood the bike straight up and it drained awesome. I put mobil 1 full synthetic in after a dino oil break in.

    I did notice something when I added oil for the initial break in. It seemed that there was more oil in there than I originally added. I immediately suspected fuel getting past the rings so I kept a very close eye on it since.

    Id say my first gallon got me about 120 miles. I was hoping for more but I live between the mountains and the ocean so its pretty hilly.
     
  9. Happy Valley

    Happy Valley Active Member

    Lord I thought it might be just me. After gently running-in the EHO35 engine with only about 2-3 hours total time, I checked the oil and smelled gas. The oil had browned so I changed it (10-30 conventional). I took the small container of used oil in bright sunlight and I could see the sparkle of micro metal bits suspended in it. Yeah and it smelled of fuel.

    Refilling the oil I screwed up and spilled a good deal of the new oil. Grrrrrr. I mean we're only talking about 100ml of oil to begin with.
    So....I drained the engine again and started over. Interesting that this new, clean oil I drained out had a little puddle of sludgy dark bits in it. Maybe my screw-up actually had a benefit as it acted like a flush.

    I have a left side rack mount so I just hook a rachet strap over a joist in the shop and to the head tube and hoist the bike vertical. Gets all the oil out.

    BTW, the engine seems to be running fine. Don't like fuel in the oil though....maybe just part of break-in?
     
    Last edited: Aug 23, 2008
  10. Happy Valley

    Happy Valley Active Member

    Yeah, me either...however they are not asked to pull a (in my case) 200 lb. rider and chromoly MTB. :lol:

    I've got an old Briggs and Stratton powered lawn mower somebody gave me, used it all summer and from the looks of it I don't think the oil has ever been change. Runs great.
     
    Last edited: Aug 23, 2008
  11. Mountainman

    Mountainman Active Member

    well you guys have reminded me to change my oil in my little Subaru.. Only changed once - right after it was new !!! It looked pretty good - just a little black - at that time. I have read on this site in regards to others having gas gotten into their oil ?? That's strange to me - while working in a small engine shop years ago - I hardly never came across that - when I did - broken or worn out rings. May be something that happenes occasionally with these engins ? I am sure that you have seen the posts regarding synthetic oils - wonder what the manufact has to say about that ? Still dark - big ride today - Ride That Thing - Mountainman
     
  12. psmcd

    psmcd Member

    joist hoist drain

    Hey Happy, I just drained mine with the suction gun and expelled in the dirty oil bucket. Now you've got me wondering and I'm going out to hoist mine, reverse for my gebe, and get a clear look at what comes out. I'll let you know. Like Mtnman, I've never had trouble with gas in oil before. My little Subaru has good compression and pulls strong so rings shouldn't be a problem.
     
  13. stude13

    stude13 Active Member

    a turkey baster works well to change oil. something went wrong during breakin to get gas passed the rings. you washed down the rings. i would try someting like teflon addative to recondition the cylender and rings.
     
  14. psmcd

    psmcd Member

    rich

    I hear you Stude but my little motor has way good compression. It starts first pull, lifts the back of the bike if I'm not sitting on it or toe on the wheel. Plus the exhaust stinks of too much gas. I haven't emailed the Subaru guy yet. But I pulled my plug; sooty black and stumbles a bit after idling or running at part throttle too long. I just ran it another 20 miles and it pulls good even if it is too rich.
     

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  15. Nuttsy

    Nuttsy Member

    I too had the engine bog down at full throttle going up a bridge. Back off a little and all is good. So, I'm thinking, what gives? Pulled the plug and just like above...carbon! My manual says clean the plug every 8hrs./daily. It had been about a week and a half of 4hr. runs. My outings last about 4hr. so, since then, I pull the plug every other trip, squirt it with brake parts cleaner, and hit it with a wire brush and check the gap. Never had the problem again. Shouldn't be running that rich though. No fuel in the oil either.
     
  16. BigDaddyT

    BigDaddyT Member

    Dur I left my book at home, whats the gap again?
     
  17. psmcd

    psmcd Member

    .03in
    .7 - .8mm
    for Subaru
     
  18. BigDaddyT

    BigDaddyT Member

    Hmm, who knows what size gears I should order from staton? My top speed is about 24ish mph and Id like to get it up around 35. I think I can handle the hills so this gear is just holding me back and probably killing my mileage. Im having to run the rpms to high.
     
  19. psmcd

    psmcd Member

    Attached Files:

  20. psmcd

    psmcd Member

    inlet needle?

    So other than rejetting to a smaller size all I can figure is a sticking or not fully seating inlet needle. Fuel in oil makes me think this is strong possibility. Never worked on diaphragm carb and hate to take things apart just guessing. Anybody have experience with these?
     
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