well, not quite a honda. a Lifan ct70 clone.
went out for a ride to the "country side" today. everything was going fine, until i decided it would be a swell idea to do a top-speed run with a tailwind. 64 was the top, btw. immediately afterwards, as i let go of the throttle, it doesn't want to accelerate anymore. would bog down at anything except "barely any" throttle. only way i made it home was with the choke pulled 3/4th the way.
i checked the manifold where it connects to the head and the carb, but neither seemed to have come loose. the air filter's still on there tight.
any ideas as to what could have happened?
thanks for any advice.
4-stroke honda- help!
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Re: 4-stroke honda- help!
Try spraying starter fluid around the rubber manifold while the scoot is running. If the engine speed changes its leaking. The chinese rubber manifolds (if it is rubber on that bike) have a tendency to crack.
Next I'd check the valve clearances to make sure they didn't change with the high speed and resulting heat to the valves.
Next in line would be the carb throttle diaphragm. Provided, of course, that the bike uses a CV carb rather than the PZ style carb.
Next I'd check the valve clearances to make sure they didn't change with the high speed and resulting heat to the valves.
Next in line would be the carb throttle diaphragm. Provided, of course, that the bike uses a CV carb rather than the PZ style carb.
Lambretta TV-175 (wish I'd never sold it!)
2005 Vento Phantom R4i 125cc (stolen)
1986 Yamaha XC180 Riva
1985 Honda CH150D Elite
1988 Honda SA50 LX Elite
1989 Honda SB50
2007 iScooter 150cc
2006 Roketa 150cc
2006 TNG Venice 50cc
2005 Vento Phantom R4i 125cc (stolen)
1986 Yamaha XC180 Riva
1985 Honda CH150D Elite
1988 Honda SA50 LX Elite
1989 Honda SB50
2007 iScooter 150cc
2006 Roketa 150cc
2006 TNG Venice 50cc
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Re: 4-stroke honda- help!
Could be you seized it also. Had that same thing happen to my 200sx. As long as it was running it may have only soft seized but it would be worth taking the cylinder off, if the above does not work. You may need a hone and new rings at best.
There is a problem with the Shoty China Mikuni carbs they go really lean at the top end on four strokes, Starts at around 6000 rpm then leans out all the way up.
There is a problem with the Shoty China Mikuni carbs they go really lean at the top end on four strokes, Starts at around 6000 rpm then leans out all the way up.
89 Honda Elite E 48cc bbk and gears all broken in... I get to 35 mph (gps) full out and Im 240 lbs. Need more speed
My toy.. http://www.youtube.com/watch?v=LWgZXLUy25U
My toy.. http://www.youtube.com/watch?v=LWgZXLUy25U
Re: 4-stroke honda- help!
well since then, it seemed to have fixed itself, only happening once or twice more since then, and going back to normal after 20 minutes of running or so. although now i know a possible factor, thanks. now it runs perfectly, although it probably needs a valve adjustment... d*** these four strokes! i miss two strokes...
Re: 4-stroke honda- help!
Four strokes are so easy compared to 2 strokes. Way less finicky and 10 times easier to tune.
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Re: 4-stroke honda- help!
no matter what i learned in my highschool small engine rebuild class, i'm still afraid of valves