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Thread: R65 Cold start problem?

  1. #1
    Registered User 10drum's Avatar
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    R65 Cold start problem?

    This 82 R65 is hard to start cold, once it starts, it doesn't have to warm up long before it starts easy. I've tried it both ways, choked, and not choked. If I keep the starter actuated, without the choke it will start to fire. I notice the carb kits listed only come with the enricher gaskets. I'll probably buy a couple of kits, but is there anything else I should replace while I have them apart?

    Thanks for all replies.

  2. #2
    Liaison 20774's Avatar
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    Are you sure that the levers that engage the enricheners are operating correctly? Be sure and check that the levers are going to the full stop when you turn the choke on. As for other parts, typically there's not much other than float bowl gaskets and maybe consider replacing the floats so you're starting fresh.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Registered User 10drum's Avatar
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    If I pull the lever past the click they are at the stop.

  4. #4
    Liaison 20774's Avatar
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    Sounds like they are adjusted correctly. What do you do with the throttle? I'm not totally sure if it should be cracked a bit when starting or if it should be left completely closed. Any differences in starting when you try different throttle openings?
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  5. #5
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    My old R65 was always hard to start when cold. I found some website that said they ALL were hard to start below 55 degrees. I stuck with that memory and didn't sweat it.

    I'm amazed at how easy my R100 starts. Which makes me think I should have done a better job with the R65. Or not.

    This is of zero help I'm sure.
    2004 R1150R Rockster | 1981 R100 | 2019 KLX250 | 1980 R65 (sold)

  6. #6
    Registered User 10drum's Avatar
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    The story on this bike is, I got it running (carbs built, battery, and tires) for the previous owner about 5 years ago. It had sat for many years. he rode it a few times, then it sat for another 5 years. He died suddenly, and I purchased from his widow. I just dropped the bowls and cleaned the jets. Yesterday I pulled the carbs and pulled the enrichers/aux carb, cleaned all those parts up as well. It started ok after that, so hopefully that was all it needed. I've only had two other BMW's, both /5's. the R60/5 had slide carbs and it's started easy, even when cold, not so with the CV carbs on the R75/5, or this R65. I do like the the handling of this R65 much better than the /5's, so maybe I'll keep it???? These are wonderful machines, but I'm so accustomed to my old British stuff, I guess I just need to ride this more???

    Thanks for the replies.

  7. #7
    Liaison 20774's Avatar
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    So just remember that with slide carbs, the throttle controls the slide itself in the carb. For CV carbs, the throttle controls the butterfly valve that is "after" the throat of the carb.

    The more I think about my CV carbs, there is a start circuit for fuel that is built in...probably different than the older slide carbs. IIRC there are ports on the CV carbs that are after the butterfly valve which are there for starting. Methinks that you should not touch the throttle while trying to start the R65...that defeats the purpose of the start circuit.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  8. #8
    Registered User 10drum's Avatar
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    Quote Originally Posted by 20774 View Post
    Methinks that you should not touch the throttle while trying to start the R65...that defeats the purpose of the start circuit.
    That may be the case, because the enricher port does bypass the throttle plate. The natural tendency on carburated engines is to pump the throttle while starting. I really liked the bing slides that were on the R60/5, they had a little accelerator pump, you could just twist the throttle a couple of times when it was cold, and it'd start right up.

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