martyd Posted August 12, 2011 Report Share Posted August 12, 2011 Hi guys got a nice 400cc twin Problem is that its "wet supming" all the time Have just fitted a new morgo pump to cure but is not any different any ideas?? MartyD I could fit a tap but think that would be the last resort as im likley to forget to open it!!! Quote Link to comment Share on other sites More sharing options...
bashplate Posted August 12, 2011 Report Share Posted August 12, 2011 Hi guys got a nice 400cc twin Problem is that its "wet supming" all the time Have just fitted a new morgo pump to cure but is not any different any ideas?? MartyD I could fit a tap but think that would be the last resort as im likley to forget to open it!!! hi marty, it will be the anti drain vavle in the crankcase that is not seating properly and allowing the oil past when parked up.could be a weak spring or the ball not seating due to dirt or a dinged seat. Quote Link to comment Share on other sites More sharing options...
martyd Posted August 13, 2011 Author Report Share Posted August 13, 2011 hi marty, it will be the anti drain vavle in the crankcase that is not seating properly and allowing the oil past when parked up.could be a weak spring or the ball not seating due to dirt or a dinged seat. Thanks Bashplate Now exactley where is the anti drain valve?? and what does it look like Thats is in relation to the pump? Thanks For the reply Marty D Quote Link to comment Share on other sites More sharing options...
alan Posted August 14, 2011 Report Share Posted August 14, 2011 Hi Marty the supply side of the pump is fed from the oil tank, as the plunger moves down the oil is forced out thro a non return valve (a spring loaded ball built into the bottom of the pump. As the plunger returns the ball is forced against a seat machined in the pump body to stop the pump sucking back up the oil that is has just pumped out. If the ball doesn't seat properly the oil from the tank can drain into the sump past the ball when the bike is stood (especially if the plunger is at the top of its stroke) The fix on a old pump is to tap the ball with a punch onto the seat to get it to seal again.. i would be suprised if this was the cause of your problem as it is a new pump and i assume it was happening before you changed the pump. You would get the same problem if the pump body was not sealing on the gasket to the engine. is the pump mounting face flat especially around the studs? Quote Link to comment Share on other sites More sharing options...
martyd Posted August 18, 2011 Author Report Share Posted August 18, 2011 Hi Marty the supply side of the pump is fed from the oil tank, as the plunger moves down the oil is forced out thro a non return valve (a spring loaded ball built into the bottom of the pump. As the plunger returns the ball is forced against a seat machined in the pump body to stop the pump sucking back up the oil that is has just pumped out. If the ball doesn't seat properly the oil from the tank can drain into the sump past the ball when the bike is stood (especially if the plunger is at the top of its stroke) The fix on a old pump is to tap the ball with a punch onto the seat to get it to seal again.. i would be suprised if this was the cause of your problem as it is a new pump and i assume it was happening before you changed the pump. You would get the same problem if the pump body was not sealing on the gasket to the engine. is the pump mounting face flat especially around the studs? Thanks Alan will have to check the face as i just unbloted the old and replace it with new Marty D Quote Link to comment Share on other sites More sharing options...
martyd Posted September 6, 2011 Author Report Share Posted September 6, 2011 Hi Guys just checking about the best way to 400cc the twin Was done badly and want to redo it if you use Cub pistons does it not leave the liner walls very thin? Or is there a better piston/Modification? Thanks Marty Quote Link to comment Share on other sites More sharing options...
jimmitchell Posted October 11, 2011 Report Share Posted October 11, 2011 Hi Marty Any update on your problems? Jim Quote Link to comment Share on other sites More sharing options...
martyd Posted October 22, 2011 Author Report Share Posted October 22, 2011 Yes Jim all sorted Total rebuild needed a Barrel as wen it was bored to 400 it had been bored through the linner and then broke rings Head was cracked ,new one fitted So new barrel new pistons new head The Morgo pump is just fine no wet sumping at all!!! Now how do you find grip in mud with a twin???????????????????????????????? Marty Quote Link to comment Share on other sites More sharing options...
jimmitchell Posted October 22, 2011 Report Share Posted October 22, 2011 Yes Jim all sorted Total rebuild needed a Barrel as wen it was bored to 400 it had been bored through the linner and then broke rings Head was cracked ,new one fitted So new barrel new pistons new head The Morgo pump is just fine no wet sumping at all!!! Now how do you find grip in mud with a twin???????????????????????????????? Marty Hi Marty Congratulations on the rebuild. Sorry but can Quote Link to comment Share on other sites More sharing options...
martyd Posted October 23, 2011 Author Report Share Posted October 23, 2011 Does anyone have the best timing advice for Pvl fot the twin? Thinking of retarding it a smidge but at the moment i have just set the marks at TDC Maybe this is to much advance? Thanks Marty D Quote Link to comment Share on other sites More sharing options...
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