I believe you will find that HAPI used a slightly modified Tillotson "OM" carburetor. That is what I bought from HAPI and I love it. HAPI's modified the Tillotson "OM" by adding their own mixture control. I ditched the float valve in question and used a GROSE-JET ball check valve in its place inorder to get the required fuel flow. The GROSE-JET No. 901 T-son .145 HD Alky. I much prefer the GROSE-JET. The Grose-jet is or at least was manufactured by the D & G Valve manufacturing company in Massachusetts. USA. I have not been able to reach them in several years. Maybe you will have better luck. Good Luck Rich Seifert KR-2 N56SR ----- Original Message ----- From: "Mark Langford" <n5...@hiwaay.net> To: "KRnet" <kr...@mylist.net> Sent: Wednesday, February 11, 2009 3:18 PM Subject: KR> FW: Float valve for HAPI Ultra Carb?
Anybody know where Willie Wilson can get a float valve for his HAPI Ultra Carb? Or do you recognize the one shown at http://www.krnet.org/misc/hapi_valve.jpg . Or maybe have a whole carb you could sell him? See his message below: >>We are surviving OK over here although sadly I have not been able to fly my KR lately due to a frustratingly small fault. A u/s float needle valve in my HAPI Ultra Carb. The trouble was lack of full power correctly diagnosed as a faulty [sticking] float needle valve. My long search for a replacement in the UK has fallen on stony ground. I tried the Sonex Aero Carb but found it unsuitable. Try as we might, it was impossible to get an equal fuel mixture to both sides of the VW. The right hand cylinders insisted in running too hot! I was advised that turning the carburetor through 90 degrees on the inlet manifold would solve the problem. Unfortunately there is insufficient room in the cowling to do that without ugly modification so I have decided to try repairing the Hapi Carb instead as it has given years of satisfactory service. The real problem I have had trying to replace the 'float valve' is there is no part number on it. I did try Great Plains but they were unable to help. I measured the jet diameter to 2.95 mm. That might be called 3 mm. <<< Thanks, Mark Langford, Huntsville, AL mail: N56ML "at" hiwaay.net website: www.N56ML.com ----- Original Message ----- From: William Wilson To: 'Mark Langford' Sent: Tuesday, February 10, 2009 5:01 PM Subject: An illusive spare Hi Mark, How are you? I hope not too much affected by the financial mess the banks have got us all into! We are surviving OK over here although sadly I have not been able to fly my KR lately due to a frustratingly small fault. A u/s float needle valve in my HAPI Ultra Carb. The trouble was lack of full power correctly diagnosed as a faulty [sticking] float needle valve. My long search for a replacement in the UK has fallen on stony ground. I tried the Sonex Aero Carb but found it unsuitable. Try as we might, it was impossible to get an equal fuel mixture to both sides of the VW. The right hand cylinders insisted in running too hot! I was advised that turning the carburetor through 90 degrees on the inlet manifold would solve the problem. Unfortunately there is insufficient room in the cowling to do that without ugly modification so I have decided to try repairing the Hapi Carb instead as it has given years of satisfactory service. Knowing HAPI I'm sure it will have come off an American motorcycle or car carburettor somewhere! Maybe even a tractor! Have you any idea where I could buy a replacement or indeed something compatible? I have attached the valve dimensions for info. Sorry to bother you, but of all the folks I know in the 'States', I guess you are the most likely to know. Otherwise life is good! To pass those cold winter days happily under cover I have been restoring my father's old tractor which he bought in 1956 when I was 16 years old. [Picture attached.] Dad was a bit reluctant to part with things but I persuaded him to change a habit of a life time. It was lying rusting in the barn back at the old homestead but now it is in my garage looking like new. The old obsolete single cylinder two stroke diesel had to be restored too and ran for the first time in a decade this week!! It was very noisy as I still have no silencer!! I remember when I first ran the KR2 [at the same place] someone complained to the noise abatement people who sent an officer round to see me. The tractor is much noisier so I'm keeping my head down and off to make a silencer asp.!! We hope you and the family are well and we look forward to meeting you again one day. Indeed, if you're ever over here you must come and enjoy our Scottish hospitality. I know we live in England, but like I tell my neighbours, I bought a bit of it and Scotland starts as you pass the gate! Margaret sends her love, me too, Willie Wilson
