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Thread: High RPM miss
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mwpayne
Hauling
Posts: 195
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posted April 30, 2005 09:24 AM |
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High RPM miss
My 74 repu has a minor issue ever since I got it a week ago. When revved past 4K (under load or not) there is a definite miss going on, won't rev any further. I've put new plugs and wires in, no change. Could it be the points?
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Tom93R1
Redlining
Posts: 458
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posted April 30, 2005 10:10 AM |
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Could also be timing.
Another possibility is too much fuel. What carb is on it?
____________
'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!
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mwpayne
Hauling
Posts: 195
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posted April 30, 2005 11:46 AM |
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I have no idea how to tell one carb from another..
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Tom93R1
Redlining
Posts: 458
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posted April 30, 2005 02:07 PM |
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I guess I meant are you running something that is probably stock or is it some kind of performance carb?
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klaus42
Rotorhead
Posts: 1877
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posted May 01, 2005 11:36 AM |
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...or too little...:
If you've got the stock Hitachi, look for the tiny cylindrical screens in the top of the carb, just prior to the inlet valves... they tend to get clogged.
Poor fuel pump performance, and fuel starvation due to crap in the lines/carb are major sources of lack of power/performance. Replace your filter(s), test your pump, and go through your carb! Float level is crucial, too...
--that is, once you've eliminated ignition issues...
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mwpayne
Hauling
Posts: 195
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posted May 01, 2005 01:20 PM |
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Thanks for the suggestions, I'll check those filters. I'm guessing its ignition because it's a definite 'miss', as if a plug wire was crapping out at high RPM. Seems like a carb deal would feel more like a bogging down.
I'll check the carb for sure anyhow, I appreciate the help.
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klaus42
Rotorhead
Posts: 1877
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posted May 01, 2005 01:24 PM |
Edited By: klaus42 on 1 May 2005 16:25
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You're very welcome.
I only mention it because I had a very similar condition...
(Of course, you'll want to check your timing first!)
...you are 100% certain that your leading and trailing aren't switched, I hope?
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