jonesy Posted July 9, 2012 Share #1 Posted July 9, 2012 suzuki gsx 600 ???, on gas tank shutoff there are off, pri, on, res, what does pri stand for. someone told kid next door it was for city use, on is for the highway, doesn't sound right to me. Link to comment Share on other sites More sharing options...
The Marshal Posted July 9, 2012 Share #2 Posted July 9, 2012 Stole this from some Suzuki Forum: PRI = "Prime" and you are only supposed to use it like a "choke" for when the bike is cold. Once motor is started, switch it to ON position. Do not run bike in PRI position. Link to comment Share on other sites More sharing options...
greg_in_london Posted July 9, 2012 Share #3 Posted July 9, 2012 Until the latest electronic switching systems, almost every motorcycle for the last 40 years has had a vacuum petrol tap. This only allows petrol to flow while the engine is running. A pipe from the inlet sucks air out of the back of the tap and the flexible diaphragm moves and opens the tap - actually slides a small plunger out of a hole. The advantage of this is that the carbs can't flood when you leave the bike. back in the 1960s and earlier you had to turn the tap off to avoid this. The downside was that if you had not used the bike for a while and the petrol had evaporated out of the carbs it could take forever for petrol to get through and you would half way flatten the battery or wear your right leg out before the carbs filled and the bike started. The 'prime' is what you would set the tap to to fill the carbs with petrol when you had not used it for a while. I'm sure that you knew that really and had just forgotten. Link to comment Share on other sites More sharing options...
darthandy Posted July 9, 2012 Share #4 Posted July 9, 2012 Stole this from some Suzuki Forum: PRI = "Prime" and you are only supposed to use it like a "choke" for when the bike is cold. Once motor is started, switch it to ON position. Do not run bike in PRI position. The guy on the Suzuki forum is wrong. greg-in-london has it right. Andy Link to comment Share on other sites More sharing options...
jonesy Posted July 9, 2012 Author Share #5 Posted July 9, 2012 both of these answers make sense to me, a young guy next door has had this bike for 2 months now and it don't start for s*** , it'll run great sometimes but he has to mess with it. I go over there and its set on pri every time. got no money for dealer. Link to comment Share on other sites More sharing options...
cecdoo Posted July 9, 2012 Share #6 Posted July 9, 2012 Freakin kids:rasberry::rasberry: Link to comment Share on other sites More sharing options...
darthandy Posted July 9, 2012 Share #7 Posted July 9, 2012 Well, if he can't get any good info from a Suzuki forum, tell him to come here and we'll help him! Andy Link to comment Share on other sites More sharing options...
dacheedah Posted July 9, 2012 Share #8 Posted July 9, 2012 seafoam Link to comment Share on other sites More sharing options...
RSTDdog Posted July 10, 2012 Share #9 Posted July 10, 2012 Greg in London's description is correct. PRI is a bypass for the vacuum petcock. Lets fuel run straight to the carbs to fill the bowls. PRI is short for Prime. If the bike is hard starting, could be a number of issues. Before he does anything else he needs to do a compression check and make sure they are all even. After compression is verified, confirm spark. Good compression and good spark, time to check fuel. Need more info to help your friend out. If he has to use PRI position all the time to get it to run, may not be enough vacuum to keep the check valve in the petcock open. Low vacuum can = low compression. The vacuum port for the petcock is typically tied to just one cylinder. If the diaphragm for the vacuum petcock leaks, it can suck raw fuel in to that one cylinder and/or suck air depending on where its cracked and the petcock position. Any work or diagnosis without doing compression and spark first is a waste of time. If he has had it for two months, unfortunately he probably bought someone elses problem. RSTDdog Link to comment Share on other sites More sharing options...
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