Mikuni maintenance- choke plungers

  • Thread starter Thread starter Reggie3cl
  • Start date Start date
I have a couple of extra long and thick cable ties suporting mine from the frame,I expect less chance of these transmitting any extra vibs to froth the fuel.
 
Mine seem to go side to side...

Cam, as fencing wire engineering goes, that is a neat piece of work.
 
Piranha Brother 2 said:
Hey Brett, are you sure they're downdraft? Umm Yep am sure They are usually fitted to Yamaha FZrs and R1s. Horizontal are a la Suzuki GSXR and what suit the Lavs. You think 
Do your FCRs have choke systems? 39's do 35's dont or do you start using the accelerator pump method? on the 35's yep I do, no biggy Interested because I'm fitting 2 pairs of 39mm FCRs to my two SF-based motors and have faith that with no chokes, I can start with a couple of pump squirts (as brother Tippie has always done successfully on his).

Quentin
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Reggie yep I will do a write up one day as have tried to keep some documents.. just getting the time to sit down and do it and will be most likely after I do the 33's or have the operation on my friendly gall bladder and then are bed ridden.

Was investigating a carb conversion on the Le Mans and have heard interesting reports about keihin FCR rollers giving up the ghost on Guzzi conversions and parts being sucked into the combustion chamber with undesirable results. Said to be due to the vibrations.
I'd be interested in reading about that where did you see that .. cant really understand how it would happen but guess anything is possible....

Vince I still am thinking of another solution for you... have a plan just got to get round to putting it together when I have some spare time that is...  :o
 

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mauricejota7604 said:
Hey Dave never heard of that one before I am planning to put a pair of 41mm Keihin Flat slides onto my 1100 Sport Guzzi as the results are amazing!!!
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You won't be needing those 40mm Dells that are sitting in a box in my garage then. I reckon they'd look good on my LeMans ;)
 
I doubt the vibes generated by a Guzzi would ruin  the slide rollers unless they were tired before they were installed. Guzzis and all big twins do create a lot of suction on overrun that often require heavy return springs if the things are being raced so the slides don't hang up. The rollers eliminate that problem but I suppose if the bike spends a lot of time idling, the resulting rattling of the slides could fatigue the spindles the rollers are on but I imagine it would take a very long time.
 
Sorry for the scare, it was my partial memory clicking in. Just checked with my source. It was the pre-roller keihins that had the problem with portions of the slide groove breaking off. Apparently cured by the addition of the rollers stopping the slides from rattling around. 

As to flat slides on a Goose, Mario at Thunderbikes reckons they are the best thing since sliced bread but usually goes the Mikuni route as full kits are available from the distributor.

Addendum Original story from TLM in Nigmegen in regards to problems they had with a race bike, where a mate was getting a V7 Sport he had bought in Europe rebuilt. A Sport 1000 in WA died of the same problem
 
Yep, them be downdrafters. I guess it's a 50-50 choice whether they slant back or forward. Tippie has been running FCRs for yonks in an SF twin - plenty of vibes in those compared to Gooses, and no sign of swallowed rollers. But yes, a grande pistone hammering away at idle will create plenty of suck and blow. The rollers are what make these things so beautiful on the twist grip end.
 
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