Hello, I am the proud owner of a 1971 25hp Johnson. I am planning on using it to fish higher lakes in the Sierra Nevada’s soon and was told by a local mechanic that the motor may have issues idling and running good once I get up in elevation. He mentioned I may need to re-jet the carb or the other option he suggested would be to get a smaller prop. Have any of you folks had any experience running these old 2 strokes at higher elevations?
If I look for a smaller prop to purchase, are they even available? Any recommendations on size?
Also, I don’t mind changing the jets out if I know I’ll be exclusively running high lakes this summer. Are the jets even available anymore ? Size?
my boat is a 1976 Welded Gregor aluminum boat. I’ve added some plywood for flooring so has a bit extra weight but still relatively light. Tiller steering pull start.
Thanks in advance for any shared wisdom. I’m really pumped on this motor and it’s been fun learning to tinker on it. I may have few more questions soon as I’m dealing with a bit of a fuel issue but I think me cleaning the carb, new tank and lines, and fuel pump should solve the issues.
...Oh and also, I just acquired a large bucket to tune it at home(not on the lake). I read to adjust the low speed idle needle/ jet, it needs to be warmed up and in gear. Can I still get it close just adjusting it in neutral? Before I cleaned the carb it liked running with the needle only turned out 1/4 turn. I noticed the end of the needle was bent and I straightened it out ever so slightly. I haven’t ran it since I’ve cleaned it and will need to adjust again. Also, I’m Not planning to engage the prop in the bucket.
thanks
Dave
If I look for a smaller prop to purchase, are they even available? Any recommendations on size?
Also, I don’t mind changing the jets out if I know I’ll be exclusively running high lakes this summer. Are the jets even available anymore ? Size?
my boat is a 1976 Welded Gregor aluminum boat. I’ve added some plywood for flooring so has a bit extra weight but still relatively light. Tiller steering pull start.
Thanks in advance for any shared wisdom. I’m really pumped on this motor and it’s been fun learning to tinker on it. I may have few more questions soon as I’m dealing with a bit of a fuel issue but I think me cleaning the carb, new tank and lines, and fuel pump should solve the issues.
...Oh and also, I just acquired a large bucket to tune it at home(not on the lake). I read to adjust the low speed idle needle/ jet, it needs to be warmed up and in gear. Can I still get it close just adjusting it in neutral? Before I cleaned the carb it liked running with the needle only turned out 1/4 turn. I noticed the end of the needle was bent and I straightened it out ever so slightly. I haven’t ran it since I’ve cleaned it and will need to adjust again. Also, I’m Not planning to engage the prop in the bucket.
thanks
Dave
