Question about Cpi Motorcycles

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My cpi sm50 misfires at about 5-6000 Revs and I'm not sure how to correct this problem and not sure if it is a common problem for this bike would love to have some feedback for this problem thanks!

Posted by Anonymous on

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Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have nice a day.
22384148 When you rev it it cuts out and it has spark new coil and
Your bike starts but then starts losing power and then just cuts out what...
https://absolutelyscooters.net/service-manuals.html
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2012 CPI SM 50 specifications and pictures

Posted on Jan 30, 2016

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Posted on Jan 02, 2017

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Hello i have a 2006 cpi sm50 and it has a weak spark witch wont let the bike start. i put in a new startor coil and a new ngk indruim spark plug but none of them has helped the bike. Please could...


Hi, Andy1151 if you have a CKP sensor it needs compression to send the correct signal to the ICM/ECM, make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in the head. If still not getting spark the usual suspects are:
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