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Post by cowan15 on May 28, 2012 2:15:47 GMT -5
hi, had a look at an re5 today, it seemed to run fine but then i noticed it was missing the small diameter vac hose that is on the carby in front in of the idle screw, and also missing about an inch to the left of the idle screw is a small plate which also should have a hose coming out of it. My question is, the bike ran ok and didnt have much lag opening the throttle, but would only start with full choke whether hot or cold, and then settled to a nice idle with choke off. What are the consequences of not having these hoses connected? thanks
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Post by wayne on May 28, 2012 4:55:32 GMT -5
Look at the photo. This is a top view. The front is at the bottom of the shot. Just to the right of the brass idle mixture screw (the one at an angle) is a little stand pipe with a vacuum line. This vacuum line runs to the bell housing. This bell housing and attached line is essential to the carby. It operates your secondary throat. With this line and bell housing missing, the bike will start and idle and rev but will be totally asthmatic and useless on the road as it will only run on its 18 mm primary throat. The 32 mm secondary throat will not open at all. I'm not sure what plate you're talking about but you can see that the bell housing is held to the carb by a flat plate. Right next to that vacuum line is another one. This hose as can be seen cconnects to a little white plastic nipple that sits on top of a small housing. This vacuum line is to an enrichment device that works around 45 degrees of secondary throttle butterfly position. It partially blocks an air intake which mixes with and foams the fuel. By partially blocking the air supply to that particular circuit, it effectively enriches the fuel mixture. It only works at fairly high throttle settings. I have ridden with this hose connected to a syringe to allow me to manually activate the valve and it took quite a bit of riding to actually be sure that it does do something. It should have no effect on cold or hot starting. Does this vacuum line make much difference ? It is subtle. Should you reconnect it ? Definitely. Some RE5's do seem to need a lot of choke. If it starts okay and idles fine once warm, I wouldn't worry too much. Also, if you're starting a bike that is not actually rideable, be aware that a minute or two idling is not enough to warm the engine. From cold, it takes around 5 full minutes of idling just to get the temp gauge to the first mark. But I think that this carby that you're describing might have more missing than just a vacuum line from the sound of it (??)  |
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Post by cowan15 on May 28, 2012 5:16:16 GMT -5
It's not a brass screw I meant to say its the idle speed screw and hole below it I think should have a screw fitting with a hole in it for the hose to pass through. And it's to the left of that, that the other plate that should have a hose is missing. I can only see 3 vac hoses running up lhs of carb as u stand facing bike from the left. cheers
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Post by wayne on May 28, 2012 5:21:03 GMT -5
The idle speed screw sits in a removable aluminium "case" which has no vacuum lines running in nor out of it. The only things in the case are threaded stubs to take the push and pull cable and a hole on its rear side to fit the angle gauge and this hole normally has a small rubber plug. Here is a view from the rear of the carby (from riders viewpoint). This shows the casing I mention above with the idle speed screw. The only things missing are the push pull cables and the aforementioned rubber plug. The vacuum lines are in front of the casing that hold the push pull lines and are not part of it. Look carefully where the black vacuum line meets the carby. There is a hole there to the left of the idle speed screw. This is for the "push" cable....ie the cable to close the butterfly. Some people remove this cable, it is not necessary to have it. To the right of the idle speed screw is the pull cable hole.  |
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Post by cowan15 on May 28, 2012 5:29:57 GMT -5
The hose in ur last pic is missing
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Post by wayne on May 28, 2012 5:31:43 GMT -5
No, there are no hoses missing other than the fuel line.
The vacuum hose to the fuel petcock doesn't come off the carby itself.
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Post by cowan15 on May 28, 2012 5:35:29 GMT -5
Haha no I meant my carb doesn't have the vac hose as seen in ur last pic
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Post by cowan15 on May 28, 2012 5:36:51 GMT -5
I'll take a photo of my carb tomorrow and put it on here
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Post by wayne on May 28, 2012 5:37:24 GMT -5
Okay.........hope it all has helped then.
Cheers,
Wayne
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Post by cowan15 on May 28, 2012 5:46:09 GMT -5
Thanks mate for your time
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