Fuel Starved Mikuni HSR 42
Stellar HDF Member
Joined: May 2005
Posts: 2,137
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RE: Fuel Starved Mikuni HSR 42
On my '92, the gas tank does not vent through the gas cap. \\; I assume the newer bikes don't either, but if you bought a vented cap that could have solved your problem.
Most people who modify carbs use huge jets that make them slobbering rich. \\; I would stick to Minton's mods if I were you.
Most people who modify carbs use huge jets that make them slobbering rich. \\; I would stick to Minton's mods if I were you.
Road Warrior
Joined: Dec 2006
Posts: 1,530
Likes: 0
From: Diamond Bar, California
RE: Fuel Starved Mikuni HSR 42
ORIGINAL: dbarnesid
Thanks for the input.
 \\;\\\\\\;
A miracle happened. I put on the new gas cap and the carb now responds to air flow adjustment (just a little... nothing dramatic). At 1 1/4 turns the idle smoothes out and the bike sounds great. That's with the Minton jets with the exception of a little leaner main. I didn't swap back to the bigger main jet.
 \\;\\\\\\;
I took the bike from Boise (2400 ft.) to the top of Bogus Basin (7000 ft.) and the thing was burblin rich. Okay, I can live with that because I might also head for the Oregon coast where the bike will be a little lean. Overall, it runs great. I can live with 32 mpg into a 30 mile headwind or 43 in calm conditions. Not sure the batwing will allow much better than that.
 \\;\\\\\\;
I'll have to investigate the HQ build though. The jets seem huge... but maybe you're closer to sea level.
 \\;\\\\\\;
Thanks again for the chat.
Much appreciated.
Thanks for the input.
 \\;\\\\\\;
A miracle happened. I put on the new gas cap and the carb now responds to air flow adjustment (just a little... nothing dramatic). At 1 1/4 turns the idle smoothes out and the bike sounds great. That's with the Minton jets with the exception of a little leaner main. I didn't swap back to the bigger main jet.
 \\;\\\\\\;
I took the bike from Boise (2400 ft.) to the top of Bogus Basin (7000 ft.) and the thing was burblin rich. Okay, I can live with that because I might also head for the Oregon coast where the bike will be a little lean. Overall, it runs great. I can live with 32 mpg into a 30 mile headwind or 43 in calm conditions. Not sure the batwing will allow much better than that.
 \\;\\\\\\;
I'll have to investigate the HQ build though. The jets seem huge... but maybe you're closer to sea level.
 \\;\\\\\\;
Thanks again for the chat.
Much appreciated.
Yes, Im at 300 ft +/- sea level,
You will need to adjust the engines quench, increase compresion abit and then you will start seeing larger gains in engine effecticey.
glad shes running better though!
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