4/6 Running Problems

[The Great Jashu]

Could it be the fuel pump is not getting good pulse at lower RPM? Maybe the fuel is going away after it uses up whats in the bowl. When you restart after it dies, do you have to use the primer or enricher?

I know you went through the carbs. But, did you soak them? A friend told me that sometimes you need to soak the bowl where the pilot jet flows to loosen and get rid of any dirt in there. I went through similar symptoms with this Invader I had problems with it dropping one cylinder. Even after I cleaned the carbs. I filled the bowl of the carb with carb cleaner and let it sit for an hour or so. Blew it out and reinstalled, and found all those problems were gone. I gotta believe that soak made the difference. Checkmarks was right about that passage and I used his advise with the small wire to clean it. I read this thread multiple times and it helped me to fix my sled.

[mswyka]

Thanks for the suggestions.  I am willing to pull, clean, soak, and poke at the carbs one more time.  It will probably have to wait until Saturday since it is back to work tomorrow.

Mark

[mswyka]

Well...I think that we are making progress.  4/6 carbs came off and the pair from our ill fated 1980 Invader went on.  Lo and behold it ran just the same way as the 440 Invader, so this gave me some hope.  Pulled the 4/6 carbs apart again  looked through the passages, carb cleaner, air, cleaning rod - got shot in the eye with carb cleaner in the process - but did find that the orifice to the reservoir in the needle jet was gummed up.  Everything cleaned and the carbs went back on.  Now she seemed to idle but would not accelerate.  A further check found that PTO side was running and Mag side is cold.  Mag carb coming off again.

[mswyka]

OOPS, helps to re-install the Pilot Jet.  But still cannot get a steady idle.

[jimvw57]

 

[mswyka]

Well....the engine is coming out again.  Tinkered with it until it seemed like it was running adequately and then went out for a tool around the back forty.  Side by side with our 79 Intruder, the Intruder read 30 MPH and the 4/6 read 60!  But after one turn something started vibrating at a rate that would shake your teeth. 

Back at the barn two of the allen head cap screws had worked themselves free and were being beat up by the back side of the drive clutch.  Looked like we lost the oil out of the gear case and somewhere we had a coolant leak adding a misty fog to the whole event.  So the long and the short of it is that the engine is coming out for a bottom to top re-build and will likely end up with a new crankcase in order the allen head capscrews in place.  And given what we have been through so far i might even accept a low-ball offer from someone who wants their own personal headache.

[Lloyd (ljm)]

Hey Mark

 If I was closer I'd make you an offer. It and my 340 Invader would make a good pair.

 seriously if you wanted to take a trip north  I would make an offer on your 4/6

 Lloyd

[jimvw57]

Yup, probably time to send it to me along with an extra windscreen for my 4/6....

[mswyka]

Jim, I couldn't in good conscience do that to you.  But the more I think about it, if someone wanted to trade for a solid, good looking, good running 82 Intruder we might be able to work something out.

[jimvw57]

Basket cases are my speciality. been one for years...   

[ChaChi]

Make sure you don't have a mouse in ur pipes, even just a small mouse bed can really send you on a wild goose chase!

[mswyka]

Make sure you don't have a mouse in ur pipes, even just a small mouse bed can really send you on a wild goose chase!

Thanks, I too have been there and done that.  Come to think of it, I hate mice and all the nasty things that they do.

[jimvw57]

Maybe the track is slipping on the drive shaft? or the drive wheels?  (clue being the speedo reading high) or maybe just a bad speedo and it isn't related...

[mswyka]

Maybe the track is slipping on the drive shaft? or the drive wheels?  (clue being the speedo reading high) or maybe just a bad speedo and it isn't related...

What? I think I need to post a photo or two.

[jimvw57]

You can't be saying a mere mechanical device is going to defeat you!!!?? I have faith in you!!