FAQ
TL;DR: For WSK 125, set ignition at 3 mm BTDC; points gap 0.4 mm. "Platinum plates are to open 3 mm before TDC." Use a feeler gauge and confirm opening. This setup cures bogging and hard starts on points ignition bikes. [Elektroda, piachu1994, post #17696662]
Why it matters: This FAQ helps WSK 125 owners quickly set and troubleshoot contact‑breaker ignition to stop bogging, misfire, and stalling.
Quick facts:
- Breaker opening (flash point): 3 mm before TDC. [Elektroda, grzeniuw, post #17696686]
- Contact‑breaker gap: 0.4 mm (set with a feeler gauge). [Elektroda, piachu1994, post #17696662]
- Spark plug gap: approx. 0.6 mm on WSK points ignition. [Elektroda, benlor72, post #17708402]
- Starts reliably with timing in a 1.5–3.5 mm BTDC window. [Elektroda, benlor72, post #17699255]
- Set the points gap first, then set the ignition point. [Elektroda, grzeniuw, post #17698039]
Quick Facts
- Breaker opening (flash point): 3 mm before TDC. [Elektroda, grzeniuw, post #17696686]
- Contact‑breaker gap: 0.4 mm (set with a feeler gauge). [Elektroda, piachu1994, post #17696662]
- Spark plug gap: approx. 0.6 mm on WSK points ignition. [Elektroda, benlor72, post #17708402]
- Starts reliably with timing in a 1.5–3.5 mm BTDC window. [Elektroda, benlor72, post #17699255]
- Set the points gap first, then set the ignition point. [Elektroda, grzeniuw, post #17698039]
When should the breaker points open on a WSK 125?
At 3 mm before top dead center. That moment the points begin to open is your ignition flash point. Set the piston to that position, then align the breaker to just start opening. This establishes correct timing for a clean spark. [Elektroda, grzeniuw, post #17696686]
At 3 mm BTDC, should the points be fully open or just starting to open?
They should just start to open at 3 mm BTDC. The initial opening is what defines the ignition moment. Full opening is not the target for timing. Ensure the contacts open and close cleanly without bounce. [Elektroda, benlor72, post #17696685]
What is the correct points gap—0.4 mm or 0.04 mm?
Use 0.4 mm. The 0.04 mm figure is incorrect for WSK contact ignition. Set the gap with a feeler gauge on the points’ maximum lift. Tighten the screw and recheck the gap after locking. [Elektroda, piachu1994, post #17696662]
What spark plug gap should I use on WSK points ignition?
Set approximately 0.6 mm. Inspect the plug, cap, and lead at the same time. Replace any cracked cable or worn cap. A correct plug gap supports reliable starting and throttle response. [Elektroda, benlor72, post #17708402]
How do I set ignition timing without a dial gauge or strobe?
Use a simple continuity method. Put an ohmmeter across the breaker and rotate the crank to detect the instant it opens. Alternatively, wire a 5W bulb in series; it goes out at opening. A tissue strip between contacts also slips free at opening. [Elektroda, Anonymous, post #17708394]
Does changing the points gap change the ignition timing?
Yes. Increasing the gap advances timing, decreasing retards it. "Each change of the contact gap causes a change in the ignition point." Always set the gap first, then re‑time to the opening point. [Elektroda, benlor72, post #17699255]
I increased the gap to 0.4 mm and now it runs worse—why?
You advanced the timing by increasing the gap, so it’s now too early. Reset timing after setting the gap. Check or replace the capacitor if weak. Set gap, then ignition point, and avoid moving other settings. [Elektroda, grzeniuw, post #17698039]
What timing range will still allow the engine to start?
It will usually fire with timing between about 1.5 mm and 3.5 mm BTDC. Verify your specific engine within that window. Once running, fine‑tune to eliminate knock, hesitation, or overheating symptoms. [Elektroda, benlor72, post #17699255]
My WSK starts, revs, then dies or bogs—what should I check first?
Check the high‑voltage coil, plug wire, and cap. A failing coil caused intermittent spark and stalling; replacement restored instant starting and clean revs. Inspect connections and replace cracked leads before carburetor changes. [Elektroda, Mate1990, post #17729786]
What should the spark look like, and can gap affect it at high rpm?
A healthy spark should not be red. "The spark should not be red." Too large a breaker gap may prevent contacts from closing at maximum speed. Too small a gap causes continuous arcing and radio interference. [Elektroda, Anonymous, post #17708394]
How can I spin the engine for ignition tests without kicking?
Use a drill with a socket as a makeshift starter on the magneto nut. Remove the magneto cap and spin while checking for opening. This saves effort and lets you observe timing changes safely. [Elektroda, benlor72, post #17699255]
How do I diagnose breaker cam/axle issues?
Inspect for wobble on the breaker cam or axle. A wobbling axle caused a machine to run only at high rpm. If you see side play, repair or replace the worn parts before final timing. [Elektroda, Anonymous, post #17729661]
How do I set WSK 125 timing with basic tools?
- Set the points gap to the recommended 0.4 mm at max lift.
- Turn the crank to 3 mm before TDC (compression stroke).
- Adjust the breaker so the contacts just begin to open at that position, then lock down.
[Elektroda, benlor72, post #17696685]
Do I need a strobe lamp and dial gauge, or can I improvise?
A dial gauge and strobe improve precision, but you can improvise if parts are worn or tools are limited. The key is a clean open/close action and correct opening point. The 0.4 mm gap is the recommended reference. [Elektroda, benlor72, post #17696685]
Why does adding a cone or paper air filter make it bog?
Non‑original paper filters can be too restrictive unless very large. The original WSK intake used a vented box, not a small paper element. A small cone may choke airflow and muddy throttle response. [Elektroda, Anonymous, post #17733872]
Should I ride without a filter or only a mesh screen?
Keep a filter installed. Mesh screens are less precise than proper elements, and debris protection matters. Also check the air inlet path for obstructions before blaming the filter. [Elektroda, Anonymous, post #17731432]
