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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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Old 11-09-2011, 11:26 AM
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Al.Fisherman Al.Fisherman is offline
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Default So your HT bicycle engine won't start, well let's take a look

Chinese HT engine won’t start? Well let's see what might be the cause of your problen.

Electrical
1. Improper wiring. Black magneto wire to black CDI wire, blue magneto wire to blue CDI wire. White…either remove or isolate.
2. Kill switch defective. Do not hook it up until you get the engine running. When hooking up the wires, don’t pay attention to colors. One wire connects to the blue magneto/CDI wires; the other wire connects to the black magneto/CDI wires.
3. Defective magneto..testing All readings are approximate.
Use Low Ohm-Meter Scale 200 Ohms
Check Ohms between BLACK wire and WHITE wire. 2 Ohms
Check ohms between BLUE wire and WHITE wire. 300-400 ohms.
4. Defective CDI..testing All readings are approximate.
Use Ohm Meter High Scale About 200-K
Positive lead on BLUE wire and Negative lead on BLACK wire
infinite (no activity)
Positive lead on BLACK wire and Negative lead on BLUE wire.
130-150 K ohms
Positive lead on Spark Plug wire and negative lead on BLUE wire.
135-155K ohms
Switch to Low Scale 20K
Measure between Spark Plug wire and Black lead. 2.5 - 2.7 K ohms
Magneto and CDI testing .. credit goes to 2Door
5. Replace Spark plug (I like NGK’s plugs, number depending on your engines condition) also replace the high voltage lead from the CDI. Use a wire core lead.
6. Check for proper timing. At TDC the cut outs in the magnet will be
in the 12:00, and 6:00 position. The key will be at the 1:00 position
7. Do away with the cheap connectors on the magneto.CDI. Replace with good ones, solder them and wrap with tape or better yet heat shrink as I do.
8. Re solder the blue magneto wire. Have seen cold solder joints from the factory. I change the wire to a better grade and to a 16 gauge.

Fuel
1. Clean fuel tank, and screen filter (in the tank) out. Tanks have been known to have trash in them.
2. Install an inline fuel filter. One might not be included in the kit.
3. Carburetor piston, check for proper instillation.
4. Carburetor to intake manifold leak. An “O” ring installed can help solve this problem. Check manifold gasket.
5. Ensure that the internal components in the carburetor are installed correctly and not loose. Later you might need to adjust the needle (attached to the carburetor piston…5 different positions)
6. Ensure the float operates correctly and the needle seals off the fuel flow through the seat.
7. Tighten bowl screws.
8. Screw on the NT carburetor only adjusts the idle.

Compression
1. Blown head gasket. Mill head replace gasket
2. Broken rings. Replace rings/piston
3. Leaking seals on the crankshaft. Replace
4. Spark plug not tight or threads stripped.

Vacuum Leaks
Shouldn’t cause a no start problem, but can cause a RPM issues.

If you don't have a Volt/ohms meter, I suggest you get one. Harbor gives them away quite often. I have gotten 4 of them. One in the house/garage/5th wheel and in my truck. ALL FREE


Looking for any other causes that will lead to a NO START problem. Please don't make this a sticky till its finished...
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Last edited by Al.Fisherman; 11-09-2011 at 01:25 PM.
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Old 11-09-2011, 12:34 PM
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2door 2door is offline
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Default Re: So your HT won't start, well let's take a look

Allow me to elaborate on Al's check list, item #1.

The plug in connectors that come in the kit, the ones on the blue and black wires from the engine and the CDI, are notorious for bad electrical connections. I had one, on the blue wire from the magneto, that was crimped onto the insulation and not the conductor. One of the best things you can do when installing the engine on your bike is to cut off and discard those little push-together bullet connectors then solder the wires together and protect the connections with heat shrink tubing.

Item #1 under the fuel heading:
Every kit supplied tank I've seen, and I've seen a few, needed to be cleaned of rust and dirt as it came from the factory. Installing one without at least rinsing it with fresh gasoline is almost a sure way to quickly clog the in-tank filter/petcock. A clean fuel delivery system is essential to a good running engine.

Al, back to you.
Tom
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Last edited by 2door; 11-09-2011 at 04:53 PM.
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Old 11-09-2011, 01:20 PM
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Al.Fisherman Al.Fisherman is offline
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Default Re: So your HT won't start, well let's take a look

Good call Tom on the connectors.. I automatically do that not even thinking about it.
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Old 02-19-2012, 03:35 AM
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happycheapskate happycheapskate is offline
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Default Re: So your HT won't start, well let's take a look

I like these connectors (Posi-Lock re-usable no-solder wire connectors)
http://www.wykedilluzionz.com/connectors/

http://img-asia.electrocomponents.co...6666038-01.gif
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Old 04-25-2012, 03:39 AM
Andy101 Andy101 is offline
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Default Re: So your HT won't start, well let's take a look

I am not getting a spark out of my plug, have been through this checklist and although the readings were a little high, still no spark. Its got a brand new plug and I tried a few different types. Everything seems to be setup right and its really starting to get to me. Is there any other reason its not sparking? It stopped working after about 2 mins of use the other morning and I have been over everything, I think.
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Old 04-25-2012, 10:01 AM
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Al.Fisherman Al.Fisherman is offline
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Default Re: So your HT won't start, well let's take a look

Quote:
Originally Posted by Andy101 View Post
I am not getting a spark out of my plug, have been through this checklist and although the readings were a little high, still no spark. Its got a brand new plug and I tried a few different types. Everything seems to be setup right and its really starting to get to me. Is there any other reason its not sparking? It stopped working after about 2 mins of use the other morning and I have been over everything, I think.
Go through this list.... it's a update. You must of missed something simple.
https://docs.google.com/document/d/1...Fjc/edit?pli=1
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Old 07-09-2012, 07:56 PM
JCG JCG is offline
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Default Re: So your HT won't start, well let's take a look

I can't start the bike. Seems electrical. I did the tests listed above on Al. Fishermans 11/09/11 post. Items 1 - 3 OK Item 4. Ohms between black and white mag. wires=2.9 ohms. Ohms between blue and white mag wires = 332 ohms. Item 5.CDI test.Positive blue to negative black = no activity. Positive black to neg. blue=varies from 38.6k to
41.9k ohms.Pos on spark wire to neg blue=varies from 41.9k to 50k ohms. Between spark plug wire and black=2.2k ohms. So.......I assume the CDI is bad? What would have caused that? When checking for spark, I took out the plug and grounded it on the head and cranked the engine. I saw a blue spark. Could this have damaged the CDI?
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Old 07-10-2012, 10:12 AM
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Al.Fisherman Al.Fisherman is offline
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Default Re: So your HT won't start, well let's take a look

Quote:
Originally Posted by JCG View Post
I can't start the bike. Seems electrical. I did the tests listed above on Al. Fishermans 11/09/11 post. Items 1 - 3 OK Item 4. Ohms between black and white mag. wires=2.9 ohms. Ohms between blue and white mag wires = 332 ohms. Item 5.CDI test.Positive blue to negative black = no activity. Positive black to neg. blue=varies from 38.6k to
41.9k ohms.Pos on spark wire to neg blue=varies from 41.9k to 50k ohms. Between spark plug wire and black=2.2k ohms. So.......I assume the CDI is bad? What would have caused that? When checking for spark, I took out the plug and grounded it on the head and cranked the engine. I saw a blue spark. Could this have damaged the CDI?
Checking for spark while grounding the spark plug, will NOT cause the CDI to go out. These electrical parts are built with no or limited quality control. I had 1 coil go out within 3 days for no reason at all.
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Looking for HT's parts?
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Engine running problems?
HT breakdown Photos

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Last edited by Al.Fisherman; 07-10-2012 at 12:47 PM.
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Old 07-10-2012, 11:16 AM
JCG JCG is offline
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Default Re: So your HT won't start, well let's take a look

Is there an up-graded CDI I should buy, or just the stock ones for $10- $20.
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Old 07-10-2012, 12:47 PM
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Al.Fisherman Al.Fisherman is offline
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Default Re: So your HT won't start, well let's take a look

Quote:
Originally Posted by JCG View Post
Is there an up-graded CDI I should buy, or just the stock ones for $10- $20.
Myself, I stick with the OEM. I personally have never had a OEM CDI go bad since I first build a bike (6) since 3/2009.
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Engine running problems?
HT breakdown Photos

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