Search results

  1. Douglasdzaster

    Frozen needle seats.

    Hello everyone, I have a 1992 Yamaha 40 MSHQ which I’ve been going through the carburetors. I need to replace the seat valves but they won’t budge. I can see where attempts have been made because the hex heads are a little damaged. But I can still get a socket on them and with a lot of pressure...
  2. Douglasdzaster

    Thermostat housing hole.

    So maybe the tubes for a 50hp will work?
  3. Douglasdzaster

    Thermostat housing hole.

    I was wondering if they were still made just a different part number for a different carburetor. I’m not where I can look at the silencer right now. Drill the holes and ta turns spray in them with the engine running? Is that better than directly in the carburetors with the silencer off? Will the...
  4. Douglasdzaster

    Thermostat housing hole.

    You’re right they are Keihin carburetors. Can’t find the nozzles anywhere. Think with so many of those carburetors out there it wouldn’t be so hard to get some of the parts. After I replied I noticed they were I recognized some of the specs and parts. My bad
  5. Douglasdzaster

    Thermostat housing hole.

    I think everything else is good Pilot jets etc. have been changed before. And I’ve been cleaning everything for a week. What hasn’t been polished to new has been replaced. Nozzles are nla but I got them clean. The seats I’m sure are the original or at least close. I’m hoping by going ahead and...
  6. Douglasdzaster

    Thermostat housing hole.

    I have some extra fuel line I can hook up to test each carburetor. Good idea. You can see in the pictures how #1 seat is out of shape. It lets the same amount through with or without the float and needle when blowing through it. Another sour stomach moment.
  7. Douglasdzaster

    Thermostat housing hole.

  8. Douglasdzaster

    Thermostat housing hole.

    Thanks but I think these specs are for 2 cylinder mine is a 3cylinder model 40 MSHQ 1992, and markings on carburetors don’t match any of these.
  9. Douglasdzaster

    Thermostat housing hole.

    I figured it out. The orifice in #1 is messed up. It’s quite a bit bigger than the other two. I’ll have to take it to town and have it removed in order to replace it. See pics for comparison.
  10. Douglasdzaster

    Thermostat housing hole.

    Actually correct that. 2 and 3 are close. #1 opens more and lets air pass through very easy and it’s float is exactly 15mm.
  11. Douglasdzaster

    Thermostat housing hole.

    Thank you
  12. Douglasdzaster

    Thermostat housing hole.

    I thought I’d check the needle valves by blowing through all three carburetors. The bottom #3 carburetor is quite a bit harder to pass air through than the other two. I remember the float doesn’t drop as far as the other two either. I know I have the float close to 15mm. Can’t remember if it...
  13. Douglasdzaster

    Thermostat housing hole.

    Oh, and I replaced the plugs not long ago. I’m still going to check them.
  14. Douglasdzaster

    Thermostat housing hole.

    You read my mind about the tach. It doesn’t have one. I was thinking today about prop set up etc. There’s some small devices that are tach as well as temperature sensors. I was wondering how accurate they’d be. Going to investigate. You where right about the nozzle seat. Took me quite awhile to...
  15. Douglasdzaster

    Thermostat housing hole.

    Using lacquer thinner. Is it ok to soak the nozzle all night as well? Didn’t think about resoaking the carburetor itself. I’ll get it in the bucket tonight as well and tomorrow polish the nozzle seat and nozzle. Thanks for the thinking. Yea when I looked down and saw that rubber plug made me...
  16. Douglasdzaster

    Thermostat housing hole.

    Just got back from town with success. The first thread or two are burred but I hit it with some emery cloth and if you’re real careful to start it straight the jet goes right in. I’m glad he got it. I had to work on the nozzle for a while back and forth to get it loose. It’s taking a long soak...
  17. Douglasdzaster

    Fuel thread sealant

    My wife found me something called Gasoila. She’s picking it up now. It’s gasoline resistant along with a long list of other things. And it can be used on about anything. It won’t harm the plastic threads on my fuel tank. We’re going to see how it does. I’ll be sharing if it turns out as good as...
  18. Douglasdzaster

    Thermostat housing hole.

    Carburetors are Keihin. BCP 6H40A FK08. Wow didn’t realize you could see that from the angle. The box is covering the 10 micron fuel water separator and those are the fuel lines. I covered them with gorilla sleeve. Same stuff we used to protect hydraulic hoses on construction equipment where I...
  19. Douglasdzaster

    Thermostat housing hole.

    I’m sorry all that and didn’t answer your question. It’s a 16’ I measured 6’ xtra deep flat bottom. Monarch. It’s got a 3/4” plywood floor and front deck. The motor is set the highest slot on the trim pin. I looked up the actual model once but can’t find it at the moment. The motor is a short...
  20. Douglasdzaster

    Thermostat housing hole.

    The 60 are the slow jets,all new. The #1 and #3 have 115 main jets which I cleaned and polished. The #2 is the screwed main jet I got the new 125 for and nozzles are nla. I looked everywhere. Hopefully he will tell me for sure it can be done without damaging the nozzle or the carburetor...
Top