Results 1 to 7 of 7

Thread: Laverda 3CL - help needed

  1. #1
    Subscriber Click here to find out how to Subscribe
    Join Date
    Apr 2006
    Location
    Lea & Perrins country.
    Posts
    1,899

    Laverda 3CL - help needed

    I know there are some Laverda enthusiats on here so I wondered if I could run a quandry past you!

    I've been helping my mate rebuild his 3CL and we are done except for ........

    It won't tick over properly. There are 2 symptoms that may or may not be connected.

    The first is with the choke. When the engine is warm the only way to get the bike to tick over at sensible revs is to leave the choke about a quarter open. If you close it the bike just revs at about 5,000 rpm. Likewise, if you go to full choke it revs.

    The other symptom is that with plenty of fuel in the tank (full) and the taps set to open the bike will eventually die from fuel starvation. If I switch it over to reserve it is fine. There is one other test I want to do tomorrow when I can ride the bike again - try one tap on open and the other on reserve and see if I can identify whether it is just one tap that is the cause.

    Col and I are really scratching our heads on this one. Can the huge reserve of experience on here offer any ideas on the cause of our problem(s)?

  2. #2
    Subscriber Click here to find out how to Subscribe
    Join Date
    Dec 2005
    Location
    Embra, Scotland
    Posts
    5,686
    Fuel flows on reserve but not when the tap is set to the normal 'on' position? Stripping and cleaning the tap/s would appear to be the solution? It may be that the fuel tank cap vent cannot supply enough air to cope with two taps so clean that out too?

  3. #3
    Subscriber Click here to find out how to Subscribe
    Join Date
    Feb 2015
    Location
    Cambridgeshire
    Posts
    7,071
    The fuel tap problem is almost certainly because of crud in the pipes that stand up into the tank or there may be small filters that sit behind the moving part of the tap though that depends on the taps fitted because there are several different types that Laverda used over the years and from my limited experience they're mainly interchangeable.

    The choke issue might be caused by the O ring on the choke plunger being worn out but if it's got pumper type carbs they're horrible things that are full of tiny little galleries that clog up over the years and need cleaning properly in an ultrasonic tank with the right cleaning agent in there.

    This might help
    https://www.ducatimeccanica.com/dell.../dellorto.html

  4. #4
    Subscriber Click here to find out how to Subscribe
    Join Date
    Apr 2006
    Location
    Lea & Perrins country.
    Posts
    1,899
    Thanks guys. I am going to start with the taps. One looks original and the other a replacement. Until I get them out I'm not entirely sure what I am dealing with but I am told there is a gauze filter over the top of the two pipes. That's not to say something hasn't got through.

    The carbs have been stripped, gone through an ultrasonic bath and rebuilt with all new parts. Colin did this. I am wondering whether there is a way to put the choke back together incorrectly so another stripdown awaits! Going to start with the taps though.

  5. #5
    Subscriber Click here to find out how to Subscribe
    Join Date
    Feb 2002
    Location
    Loughborough
    Posts
    15,339
    bit late now and you are probably sorted.

    the guys at SPR Racing at Ruddington are ex laverda racers and still look after Laverdas for local riders. Well worth getting in contact with them if you need any tuning or service work doing http://www.sprracing.co.uk/dyno great prices as well.

  6. #6
    Subscriber Click here to find out how to Subscribe
    Join Date
    Apr 2006
    Location
    Lea & Perrins country.
    Posts
    1,899
    Great. Thanks. A lot closer than the guy we have been using!

  7. #7
    Subscriber Click here to find out how to Subscribe
    Join Date
    Sep 2012
    Location
    Torbay, England
    Posts
    22,678
    I had this problem on 70s bikes. The normal fuel tap position (via the stand pipe) gets clogged so the bike will only run on reserve. That's less dirty d/t less use.

    High revving on choke can be the fast tickover has been set too fast. It can also happen d/t fuel starvation (see above). Too little fuel = revs but no power.
    08 R1200GSA
    76 Suzuki GT750

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Anyone attending a Ride Out or Event organised through the UKGSer Forums does so at their own risk.
UKGSer.com or anyone organising an event posted here will not be held responsible in any way for damage or personal injury sustained while attending any such events.

Members attending any such event do so at their own risk.

The text, images, graphics, sound files, animation files, video files, and their arrangement on this Website are all subject to copyright and other intellectual property protection. These objects may not be copied for commercial use or distribution, nor may these objects be modified or reposted to other sites without prior written permission.

Disclaimer: Use or depiction of the BMW logo or trademark throughout this web site is for illustrative and editorial purposes only, and to the benefit of the trademark owner, with no intention of infringement of the trademark.

The UKGSer Forums may include adult content for which it cannot be held responsible. Your use of this website constitutes acceptance of the UKGSER network privacy policy

"Its about being a grown up hooligan - and if that means a dark visor, remus open pipe and a bit of speeding out of town then all well and good"