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Old 04-23-2015, 06:01 AM   #1
Prodigium OP
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Location: Portland OR during school year. SW MI in summer
Oddometer: 113
Mpg!?

I've got a 1987 Honda CH-150 Elite. It is giving me 50 and sub 50MPG and that is even less than my Burgman 400. I am not a heavy hand. I've done everything I can think of; making sure the choke works, which it does, rejetting leaner all to no effect. So, carb replacement is on the docket this summer. Carbs no longer available from Honda - and at $350 I'd not buy it anyway - so I need a source for a carb. Any help, guys?

Thanks.
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Old 04-23-2015, 06:12 AM   #2
exoff-roadgoat
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I'm not a scooter guy....yet. Carbs rarely need replacing, if ever. Is the brake dragging? Check air cleaner. Dirty?
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Old 04-23-2015, 07:35 AM   #3
Bronco638
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Wheel bearings shot? Low air pressure in the tires?
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Old 04-24-2015, 04:40 AM   #4
Prodigium OP
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Bad MPG

True, carbs rarely need replacing but I've addressed all the usual suspects; tire pressure, brakes dragging, dirty air cleaner, overcooling due to a stuck thermostat, slipping belt, etc. The engine is running so rich that at stoplights when the exhaust blows over me it is almost choking. So, since all the usual suspects, and some unusual ones are OK it points to a bad carb. Now, I just have to find one.
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Old 04-24-2015, 07:17 AM   #5
Bronco638
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Float set slightly too high? Worn needle? Worn needle jet? Worn slide? Instead of a new carb, how about a complete rebuild kit? Another used carb may have the exact same (or similar) issues. I had a DR350 carb that had a worn body (slide guides were shot) so it would never idle or run properly. I wonder if that's what you're dealing with.
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Old 04-24-2015, 10:41 PM   #6
fullmetalscooter
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60 to 80 mg is what is often said . eg http://www.fuelly.com/motorcycle/honda/elite_150

Beyond the carb you also have to consider are the rollers toasted along with a cracked belt . Ether or will take away MPG . Rollers are only 20 bucks to buy. a new belt 25 .
Guys here have put china carbs bought off flea bay for 35 bucks on elite 150 with no issues . All depends if the carbs warn out . If you used eythonal based gas in the carb which will kill the rubber gaskets etc. Hope that helps . I myself would do all 3 just to bring it back up to 100% . For under 100 bucks you can't go wrong .
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Old 04-25-2015, 06:40 AM   #7
Prodigium OP
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Mpg

Float level is perfect, jets are new, slide fits snugly. I bought it with 1200 miles on it and the mpg has been bad since day one. Perhaps it is the ethanol gas, though Lately I've taken to putting ethanol free gas in it. It has a good belt and the rollers I replaced with Dr. Pulleys. So, I'll get a rebuilt kit and see what happens. One of my suspicions is that the ethanol gas coroded a passage into another passage and is allowing gas to pass through somewhere.

Thanks
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Old 04-26-2015, 04:51 PM   #8
Birdmove
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Both of our scooters (as in my avatar/info in each message) easily get well into the 80's. The darn Sym, even though it's got a bit bigger engine (an actual 172 cc's----not a real 200) can get into the 90's. Most 750 and near sized motorcycles I've owned got 45 mpg minimum. The 500 cc's got 65++. The Yamaha XT225 got amazing gas mileage. Kept under 50mph, it could get like 125 mpg. But then, I never flog my motorcycles...
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Old 04-26-2015, 11:52 PM   #9
Eliter85
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You can get a china carb for >$30. I have one in my elite right now and it works fine. Just ebay it.

I bet your Electric choke is broke.

+1 to everything Full Metal said.

And why not just add a new spark plug while you're at it. Good luck.
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Old 04-27-2015, 04:42 AM   #10
Prodigium OP
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Location: Portland OR during school year. SW MI in summer
Oddometer: 113
Mpg

Choke works fine, tested it and replaced it in case it was an intermittent problem, no joy. Have a new iridium plug in it. I'm going to replace the carb, that seems to be the problem.
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Old 04-27-2015, 08:27 PM   #11
fullmetalscooter
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Hope the carb change out works to cure the issues of MPG.
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Old 04-28-2015, 09:54 AM   #12
73Mustang
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Why mess with anything if the bike is running well.

Instead of a new carb, spend the $350 on gas. That's 175 gallons. Even at 50 mpg, you can go almost 9000 miles for that money. So who cares about mpg. You'll probably end up spending more by trying to increase the mpg.

p.s. How is the gas tank vented? Is it possible gas is evaporated while the bike is parked?

73Mustang screwed with this post 04-28-2015 at 01:21 PM
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Old 05-03-2015, 10:49 AM   #13
Eliter85
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That's a good point! The gas cap gasket on my elite was falling apart when I got it and I had it replaced. No idea if it was a leak though.

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