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Re: High / low speed jets both turned into base...
>>The Following is the Instruction File for Setting the Air Mixture Screws. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw). >>Now Setting the Air Mixture Screws: >>****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine. >>Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. **Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to Max and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starved for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade and for Chainsaws and Trimmers they Do Not Bog DOwn Under a Load. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs.** >>Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required. >>Now Set the Idle Air (L) Mixture Screw so there is No Hesitation when Rapidly Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.
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Hi chris tanti Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws. Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement. If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm. Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position. Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM. The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm. Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed. Alway use the "lightly seated" method if you have not changed the screw settings. Please take time to rate me Bud
Can't find the manual right off hand for a 145 for some reason....but...
The wahlbro carbs are 3/4 out from lightly seated on high and low speed screws. The zamas are 1 1/4 turns. Some zamas have no high speed needle.
Anyway if set the high and low speed needles for about 1 turn that will get you running and allow tuning from there.
If it starts at completely cold to fine tune the high jet adjustment.first off the high speed jet should be initially set at 1 1/2 turns out from lightly bottomed all the way in. next when you do your prestart routine,choke all the way on,primer pumped two times,throttle set at the high speed position,ignition key on,fuel line turned on.(this is my prestartup for my 8hp tecumseh)yours may be slightly different.use whatever starts your machine the easiest! once my machine starts up i can almost immediately turn the choke completely off. i can do that because the high speed jet is opened enough or rich enough for the engine to run.if you adjust the high speed in it will lean the motor out(you found that to be true!) to where it will miss and backfire and eventually quit. start at 1 1/2 turns out and start the engine,once the engine starts if you take the choke off right away use what it does as a guide to high speed adjustment. if the engine quits turn the screw out 1/4 turn and so on.use the very first cold startup as the test for high speed mixture adjustment. at completely cold startup you have the jet adjusted correctly when the engine will sustain itself when you completely take the choke off very shortly after startup. let the amount of choke you need at cold start to keep the engine running be your guide.too lean and the engine will not stay running without the choke at all,too rich and the engine will not pull under extreme loads and will show signs of black soot out the exhaust. you want the jet adjusted so within 5 seconds of cold start the engine will stay running with no choke at all. find that needle setting ( don't ad any more!! ) and you'll be good to go.keep in mind the above is not optimum and is a little rich but you will like the way it starts,stays running,and overall performs as adjusted above.
on the side of the carb you should find two screws, one for the low speed jet nd one for he high speed jet. Turning the low speed jet only about a 1/4 turn at a time, adjust it in or out until it idles smoothly. Go to arboristsite.com, chainsaw and do a search on tuning for more complete info.
You should have a High Speed carb adjust and a Low Speed carb adjust. If it's running fine while idling, adjust the high speed setting. If you have two nobs, its the lower one. May be set wrong. If you don't have two nobs, remove the carburator and check the jets to make sure they are completely clean or better yet, order yourself a carb rebuild kit to take care of all of this. I just rebuilt my 1971 evinrude 4hp and the carb kit made the world of difference.
t is your throttle stop
l is your low speed jet for fine tuning low rpm.s and idel itself.
h is high speed jet.
basic settings for the L and H jets are one turn out / open
throttle stop will vary but once you have it ideling you can tune that one while you are holding the trottle then go back to the L jet till u got it running sweet. then re adjust throttle stop if necessary. now move on to high speed jet.
Hello Randy. I can talk you through making adjustments to your Jiffy ice auger engine.
1. Read through the whole list before you start adjusting. 2. Close both jets GENTLY 3. Open the Low speed 1/4 turn 4. Open high speed jet 1 1/4 turn5. Start engine. 6. Adjust low speed until idling smoothly. 7. Open her up wide open. 8. Adjust High speed until engine transitions smoothly from idle to high speed without bogging. 9. Shut engine off. Let it cool. 10. Once engine is cold. Fire it up and let it idle for 30 secs. Open it up wide open again. Adjust if necassary.
NOTE 1: The trick with the Jiffy's is to tune them during cold (ice fishing) weather. NOTE 2: Low speed screw,the one on the left. NOTE 3: High speed on the right. Good luck ice fishing! Regards, Joe
1 1/2 turns open on the adjusting screws. Fine tune it from there. Low speed jet should get the unit to idle and high speed jet should take it to peak speed then be backed off until it starts to diesel
Sure. (This will void your warranty and bypass smog requirements!) There is a red and a white limiter cap on the carburetor adjustment screws. Red= High speed / White = Low speed. Remove limiter caps. Turn both jets a 1/2 turn counter clockwise, Start, then fine tune. Use the low speed and idle screws to smooth out low to idle speed and the hi speed jet to tune the full throttle.