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Post by strick on Jul 22, 2008 19:41:00 GMT -5
Because my manual is beyond WEAK, can you guys help me with a simple question(s)?
Three possible petcock settings -
long arm left
long arm right
long arm down
Two of these setting do not allow fuel from tank without vacuum hooked up and engine running. One allows free flow.
The vacuum assisted petcocks I have owned in the past did not need to be turned on and off. All the other petcocks were on dirtbikes and older enduros with NO vacuum assist. What setting does what? Primary, reserve, off-->?
Thanks
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Post by solo2racr on Jul 22, 2008 20:08:12 GMT -5
The 3 positions are Primary (lever towards rear of bike) On (lever pointing down) and Reserve (lever pointing towards front of bike). Primary will flow gas regardless of whether the bike is running or not. The other 2 (On & Reserve) will only flow when there is a vacuum present on the hose going to the intake tract on the engine.
Hope this helps
Ken
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Post by StewRoss on Jul 23, 2008 3:22:31 GMT -5
The idea of a full flow position (PRI) is to allow fuel through to start the bike, should you ever run it dry on the normal setting...if you do run it dry simply going to reserve won't allow any more fuel through as the engine needs to be running for this to operate...so because of that you have to use the full flow position...hope that makes sense...whew... SR  |
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Post by strick on Jul 23, 2008 9:56:02 GMT -5
Thanks guys!
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jeffz
Full Member
Posts: 215
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Post by jeffz on Jul 23, 2008 16:09:55 GMT -5
Remember if you switch out carbs, and the new one isn't vacuum operated, then you have to leave it on primary. And switch it to Reserve or On when it's not running or you'll have a puddle of gas under your bike.
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Post by solo2racr on Jul 23, 2008 16:46:02 GMT -5
Remember if you switch out carbs, and the new one isn't vacuum operated, then you have to leave it on primary. And switch it to Reserve or On when it's not running or you'll have a puddle of gas under your bike. The up side to this is that you can use the stock petcock. The downside is that there is no reserve. I'm working on a kit to adapt the stock petcock to non-vacuum and still have off-on-res. |
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Post by mick2cu on Jul 23, 2008 23:20:06 GMT -5
One time I left my non-stock petcock in the "on " position on my old race bike, (with non-stock carburetor), and unbeknownst to me the gas flowed down into the crankcase..... On the track day the bike pumped out a ton of oil/gas mixture through the breather tube out over my rear slick and onto the race track..I almost crashed, but saved it. Others may not have been so lucky, so beware!!!
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Post by StewRoss on Jul 24, 2008 2:31:44 GMT -5
The standard SR400 carby manifold has two spigots in it that would be able to run the older model taps...also some of the XS650 ones have this facility as well and are easily available. I have a 400 one on order to see if it accomodates the VMS carbs...I'll let you all know when it arrives and how it fits...unless someone has already done this? SR  |
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Post by strick on Jul 24, 2008 9:28:28 GMT -5
Also, thanks for the heads up on the non-stock carb. I may have over looked the on/off non vacuum situation. I am currently looking for a 37mm FCR. When the right price fits my appetite I am going to give it a try.
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Post by karamsay on Jul 25, 2008 15:05:40 GMT -5
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