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T150 runs poorly
#779429 07/22/19 10:04 pm
Joined: Aug 2001
Posts: 433
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Joined: Aug 2001
Posts: 433
I have a T150 that has new Premier AMAL carbs installed. From idle to about 1/4 throttle the bike runs badly, misfires, little power, as if starving for fuel. The sparkplugs have almost no color on them so it looks like it is running too lean. Once I get past 1/4 throttle the bike wakes up and run great. I'm suspecting that the slide needle position is set too lean buy it's such a pain to change that on a triple I was wondering if you guys might have other ideas about the cause of this problem. Compression is about 90-85-90.


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Re: T150 runs poorly
Curmudgeon #779489 07/23/19 2:52 pm
Joined: Mar 2006
Posts: 1,588
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What number slides, old carbs and new carbs?


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
2018 Kawasaki Z900RS


Everything will be alright in the end. If its not alright, its not the end.
Re: T150 runs poorly
Curmudgeon #779505 07/23/19 5:10 pm
Joined: Aug 2001
Posts: 433
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Problem fixed. The two little passages in the bottom of the throat of the carburetors were partially plugged up with crappy fuel residue. They are called the idle output and idle by-pass circuits. I tried blowing out these passages with carb cleaner and for once I lucked out. As soon as I started the bike after this the idle increased by 500 rpm so I knew I was making progress and sure enough the bike runs great now. Now if we could only do away with this crappy Ethanol gas we wouldn't have these problems.
I'm going to keep an eye on the plug color and will likely replace the #17 pilot jets (Premier type) with the richer #19 ones per John H. suggestion.


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Re: T150 runs poorly
Curmudgeon #779582 07/24/19 12:11 pm
Joined: Oct 2003
Posts: 11,213
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Fuel is the issue, especially if the bike is rarely ridden. Two subjects you may wish to research...

• "Top Tier" fuels. https://www.toptiergas.com/licensed-brands/

• StarTron fuel conditioner, which is both a stabilizer AND a cleaner. http://www.starbrite.com/startron

Hope this helps.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: T150 runs poorly
Curmudgeon #779909 07/28/19 1:32 pm
Joined: Aug 2001
Posts: 433
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Posts: 433
Yes, Ethanol fuels wreck havoc on engines. This Trident had been sitting up for a couple of years before I got it. Now that she runs right I will be using Ethanol free gas for sure, no addatives needed and it's available locally. Thanks.


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