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Post by jollyjoiner on May 8, 2013 18:13:04 GMT 1
Took the 250lc out for a spin again and all was well apart from one little strange stutter in top gear at about 7500rpm on a constant throttle, it seemed to loose some power as if it was choking up or dropping a cylinder ? i'm not quite sure.
Once i've slowed down again things splutter just a little then all seems fine again, and if I ride it like I stole it and give it the beans up and down the box all the time everything is fine.
One thought that I did have was that if one of the float bowls was not filling fast enough when at a constant high ish rev so starving a cylinder of some fuel ? may have to check the float hight !!
Any ideas guys ?
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Post by moveitdriver on May 8, 2013 18:26:08 GMT 1
Your float height may need to be higher
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Post by jollyjoiner on May 8, 2013 19:10:50 GMT 1
So I tip the carb upside down and measure where the float sits ?
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Post by muttsnuts on May 8, 2013 19:40:58 GMT 1
check your fuel lines, make sure they have the right internal diameter and that they haven't started to collapse etc due to the ethanol in the petrol
also, float heights is a good one and also check the flow rate out of your fuel tap
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Post by jollyjoiner on May 8, 2013 19:49:49 GMT 1
check your fuel lines, make sure they have the right internal diameter and that they haven't started to collapse etc due to the ethanol in the petrol also, float heights is a good one and also check the flow rate out of your fuel tap Plenty of fuel coming through fuel tap and fuel line are new. When I got bike out on sunday to try it I filled the tank with fuel that I had in garage, this was the first time the tank has been full so had max head of pressure. When I turned fuel on and started bike petrol pissed out of left carb overflow, had the float bowl on and off for an hour trying different settings untill I put a new float valve in which sorted it. It does sound like it could be a float issue, may need to check height, may need making higher to keep more fuel in the bowl |
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Post by arrow on May 8, 2013 19:55:04 GMT 1
Did you use genuine Mikuni float valves?
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Post by jollyjoiner on May 8, 2013 20:21:51 GMT 1
Did you use genuine Mikuni float valves? Errrrrr not sure, Got them from norbo, but only put one in !! |
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Post by flames on May 8, 2013 20:27:44 GMT 1
how long had you had the fuel in the garage?
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Post by jollyjoiner on May 8, 2013 20:35:00 GMT 1
how long had you had the fuel in the garage? Only about a month, It's the High octane fuel I use in my race bike |
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Post by skaterboy on May 9, 2013 1:24:53 GMT 1
Keep a eye on your coolant level may have done the head gasket. I had a similiar problem as you have described turned out the head gasket had failed slightly and was sucking coolant into the right cylinder. As a result it leaned out and started to melt the piston dome just got it in time.
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