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- Weak Spark Gilera 50 Scooter: Troubleshooting Gilera Typhon Starting Issue & Coil Module

Tom2602 12168 14
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  • #1 16640229
    Tom2602
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    I have a problem with the Gilera Typhon scooter. The scooter does not start and the problem is a weak spark when turning the starter.
    The longer the spark spins the smaller and smaller it is until it disappears completely. After a short break it is still the same.
    I am asking for some specific advice and I have a question whether the coil module may be responsible for such symptoms?
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  • #2 16641160
    DriverMSG
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    There you have 3 wires on the coil. Check for a short to ground with green ignition ON.
    Check that the white shows the generator voltage while cranking the engine.
    Red goes to the pulser.
    If there is voltage on white and no short to ground on green, the ignition coil is dying.
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  • #3 16641167
    Tom2602
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    In the morning I will check it and write what the matter looks like.
    And do you know what voltage should be on the green cable that goes from the ignition coil to the module?
    Some people write that it should be 40-50V and on the Internet in one video the guest gave the value of 80-100V.
    Which values are correct?

    Added after 3 [minutes]:

    If you write that the coil "dies" it is about the one in the magneto?

    Added after 2 [hours] 17 [minutes]:

    The cables are checked with a meter and there is no short to ground on the green cable, it shows 38-43V when turning the starter.
    It has a white cable while shooting, it also shows some value. If it stops spinning it drops to zero.
    So what's my problem?
    In the coil at the magneto or the module coil?
  • #4 16641329
    BANANvanDYK
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    There should be no voltage on the white because it is the ignition ground connection. Check if the mass of the engine is properly attached (mass of the starter) - from the starter mounting bolt to the voltage regulator mounting bolt on the side of the frame.
    Check the resistance of the CDI supply coil on the green wire when the spark is strong and the spark is lost.
  • #5 16641362
    DriverMSG
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    Sorry for the mistake (night fatigue came out), the voltage should be green with the ignition on. The value from - to varies depending on many factors and should not exceed 350V AC.

    - Weak Spark Gilera 50 Scooter: Troubleshooting Gilera Typhon Starting Issue & Coil Module

    Check the resistance on the pulser (red wire to ground) there should be about 130?.

    What model of CDI ignition coil (high voltage cable to spark plug coil) do you have?
  • #6 16642696
    Tom2602
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    The voltage on the pulser within 125-130 ohms.
    And I have the module with an additional mass cable.

    Added after 1 [hours] 6 [minutes]:

    When turning the starter, the scooter starts to catch and fire during a longer spin, but after about a minute it goes out.
    Then again the firing problem ...
    Wet candle ...
    What could be the reason for not starting the scooter?
    A week ago I did piaggio typhona, it fired after touching the starter ...
    I am asking for advice ...
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  • #7 16642765
    DriverMSG
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    Tom2602 wrote:
    The voltage on the pulser within 125-130 ohms.
    Correct resistance.
    Tom2602 wrote:
    And I have the module with an additional mass cable.
    It doesn't matter in this case.
    Tom2602 wrote:
    When turning the starter, the scooter starts to catch and fire during a longer spin, but after about a minute it goes out
    I support my first suspicions. Faulty ignition coil - CDI module.
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  • #8 16642954
    Tom2602
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    Tomorrow I am ordering the module and it will work.
    I will let you know if it helped.

    Added after 8 [hours] 9 [minutes]:

    Today I was in the garage and the scooter started with a problem but it fired.
    I noticed that the suction is very hot and the scooter went out after about a minute and refused to start.
    After disconnecting the choke and cooling the engine, the scooter fired and walked for about half an hour.
    After plugging in the plug, it came normally for half a minute and it started to muddy and went out.
    Could the automatic choke be a problem?
  • #9 16645879
    BANANvanDYK
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    Carburetor cleaned? Since it only works on the suction, the main jet is clogged. Possibly idle jet and idle air adjustment.
    Original air filter, undamaged?
  • #10 16648117
    Tom2602
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    The carburetor was cleaned twice but the nozzles were not clogged.
    When you manage to fire it, it runs at low speed, only the screw from the mixture is unscrewed only half a turn.
    Even when it goes out, the candle is flooded.
    I have already ordered new shaft seals because it seems to me that I am licking left air.
    And can it be the fault that someone previously installed a non-vacuum fuel tap and too much fuel is poured from it and overflowing through the nozzles?
    I know that the needle valve should close the fuel, but the fuel does not fly from the vacuum tap as much as it does, because it is like pouring from a good hose.
  • #11 16649395
    BANANvanDYK
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    The exhaust is not clogged? Series or tuning exhaust?
    Vacuum port on the carburetor clogged after replacing the vacuum tap with a hand tap?
    - Weak Spark Gilera 50 Scooter: Troubleshooting Gilera Typhon Starting Issue & Coil Module
    These are general regulatory data for the HiPer2 air-cooled carburettors, slight variations may occur between the scooter models. For this carburetor to work properly, it must have a blockage on the inlet port (yellow plate with holes).
  • #12 16649809
    Tom2602
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    The exhaust is standard and the vacuum connection is blocked. What's with the lock on the spigot?
  • #14 16651457
    Tom2602
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    Can the reason for flooding be the lack of a washer under the main nozzle?
    Today I noticed that the nozzle is not going to the end. That is, when I tighten it fully, the nozzle head does not touch the edge of the carburetor body.
    Can it suck fuel there?
  • #15 16651775
    BANANvanDYK
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    No. The nozzle seals against the sprayer at the butt joint, therefore it may stick out from the body.
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Topic summary

✨ The discussion revolves around troubleshooting a Gilera Typhon scooter that exhibits a weak spark and starting issues. The user reports that the spark diminishes and eventually disappears when the starter is engaged. Various responses suggest checking the ignition coil, specifically the connections and voltages on the green and white wires. The user confirms the absence of a short circuit and provides voltage readings, leading to further inquiries about the CDI module and potential issues with the carburetor. Suggestions include examining the engine's ground connection, the CDI module, and the carburetor's jets and settings. The user also considers the possibility of flooding due to a non-vacuum fuel tap and the condition of the main nozzle. The conversation highlights the importance of proper electrical connections and carburetor adjustments for resolving the starting problem.
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FAQ

TL;DR: On Gilera Typhon/HiPer2, CDI supply on the green wire measures up to 350 V AC; “the voltage should be green with the ignition on.” Test pulser (~130 Ω), grounds, then suspect CDI/coil if spark fades. [Elektroda, DriverMSG, post #16641362]

Why it matters: This FAQ helps Gilera 50 owners fix weak-spark, no-start, or stalls without chasing the wrong parts.

Quick Facts

How do I fix a weak spark on a Gilera Typhon 50?

Verify the green CDI supply voltage while cranking and confirm the pulser is ~130 Ω. If supply is present and grounds are good, the CDI/ignition coil is the likely fault. Replace the CDI/coil unit after confirming harness integrity and connectors. “Faulty ignition coil - CDI module.” [Elektroda, DriverMSG, post #16642765]

What voltage should be on the green wire from the stator to CDI?

Measure AC on the green wire during cranking. Expect a wide range that should not exceed about 350 V AC. Values depend on cranking speed and battery state. Seeing meaningful AC here confirms the stator’s CDI source coil is working. If green is live and grounds are clean, look to the CDI/coil. [Elektroda, DriverMSG, post #16641362]

Should there be any voltage on the white wire?

No. The white lead is the ignition ground reference. Voltage here points to a ground path problem. Inspect and clean the engine-to-frame ground from the starter mounting bolt to the regulator mounting point. Restore solid grounds before swapping parts. Poor grounds can mimic CDI faults. [Elektroda, BANANvanDYK, post #16641329]

What resistance should I see on the pulser (pickup) coil?

Measure from the red wire to ground with ignition off. The pulser should read about 130 Ω. A reading far from this suggests a pickup issue. A good pulser with weak, fading spark shifts suspicion to CDI/coil or poor grounding. [Elektroda, DriverMSG, post #16641362]

My meter shows 38–43 V on green while cranking. Is that OK?

Yes. Users report around 38–43 V AC on the green lead during starter cranking. That indicates the stator source coil is producing energy. Correlate this with strong grounds and a correct pulser reading to isolate the CDI/coil as the next suspect. [Elektroda, Tom2602, post #16641167]

Engine starts after long cranking, runs ~1 minute, then dies with a wet plug—what’s likely?

A weak CDI/ignition coil can produce an initial spark that degrades as it heats, causing a stall and flooded plug. Replace the CDI/coil after verifying green-wire voltage and pickup resistance. Heat-related failure in the module is a common pattern here. [Elektroda, DriverMSG, post #16642765]

Could the automatic choke (enricher) be the reason it stalls hot?

Yes. A stuck or overactive automatic choke can over-enrich when hot, causing muddy running and stalling. One user found disconnecting the choke allowed a restart after cooling. Test by unplugging the enricher briefly and observing behavior, then service or replace it. [Elektroda, Tom2602, post #16642954]

Carburetor only runs on choke—what should I check first?

Clean the carb thoroughly and ensure the main jet and idle jet are clear. Verify idle air settings and confirm the original, undamaged air filter is installed. If it only runs with extra choke fuel, your main circuit is restricted or airflow is incorrect. [Elektroda, BANANvanDYK, post #16645879]

I replaced the vacuum fuel tap with a manual valve. What about the vacuum port?

Block the carburetor’s vacuum port securely after switching to a manual fuel tap. An open port is a major vacuum leak that will upset fueling and cause stalling or lean conditions. Confirm your block-off is airtight and routed correctly. [Elektroda, BANANvanDYK, post #16649395]

What is the inlet restrictor plate on the manifold and why is it needed?

It’s a perforated plate at the intake spigot that modulates airflow for correct carb signal. Without it, the carb can receive too much air and the engine suffocates or bogs. Ensure this plate is fitted if your setup requires it. [Elektroda, BANANvanDYK, post #16650175]

Can a missing washer under the main jet cause flooding?

No. The main jet seals against the atomizer (sprayer) at the butt joint. It may sit proud of the carb body and still seal correctly. Look elsewhere for flooding, such as float needle wear or incorrect fuel tap choice. [Elektroda, BANANvanDYK, post #16651775]

How do I verify the engine and frame grounds on a Typhon?

Inspect the ground path from the starter mounting bolt on the engine to the regulator mounting bolt on the frame. Clean, tighten, and continuity-check this path. Any corrosion or looseness here can cause weak or disappearing spark symptoms. [Elektroda, BANANvanDYK, post #16641329]

Quick 3-step test: is my CDI/ignition coil bad?

  1. Measure AC on green while cranking; confirm it’s present and not abnormal.
  2. Measure pulser resistance red-to-ground; target ~130 Ω.
  3. If both pass and grounds are solid, substitute the CDI/coil module. “Voltage should be green with ignition on.” [Elektroda, DriverMSG, post #16641362]

What is a CDI module in this scooter?

The CDI is the capacitor-discharge ignition module that stores and releases energy from the stator’s green lead to fire the coil. In this thread, a fading spark and hot stall were traced to the CDI/coil assembly. Replace it after basic tests. [Elektroda, DriverMSG, post #16642765]

Could a clogged exhaust cause no-start or stalling here?

Yes. A restricted exhaust can choke the engine and mimic fueling faults. Confirm whether your exhaust is stock or tuned, and inspect for blockages or carbon buildup if symptoms persist after carb service. [Elektroda, BANANvanDYK, post #16649395]

What mixture screw setting should I expect after cleaning?

Start from a typical baseline then fine-tune, but if it only idles with the screw barely out and the plug floods, look for air leaks or fuel delivery issues first. Non-vacuum taps can overfeed if the float needle leaks. [Elektroda, Tom2602, post #16648117]
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