Question about 50cc 4-Stroke Shortcase Engine - QMB139

1 Answer

50cc qmb139 64mm valves to 69mm now motor really tight wont start with starter burnt up 2 starters will kickstart with a fight

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Renaissance:

    An user who is expert in 3 categories / brands.

  • Master
  • 1,727 Answers

When reinstalling the head you most likely damaged the timing chain or it's bound up. another possible issue is it's put together wrong, i.e. cam gear, timing chain guides. without the spark plug in that engine should roll over by hand... Changing valve size isn't a part of the problem. If you swapped a different cylinderhead to do this then is it part of the problem ???

Posted on Oct 20, 2013

Testimonial: "yes I got a rebuild kit and if it starts it runs great but cant use the elec start bec it wont turn the motor over but can kick start it with a fight"

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do you change kickstart shaft on lem 50 the one that starts forward


I don't understand your question but I have a 1993 LEM 50cc I have rebuilt and I have a hard time with the forward style kick starter .are you saying that there is a rear style? I have some other questions if it would be ok.

May 06, 2015 | LEM Motorcycles

2 Answers

Can I add a backup kick starter?


That is not likely. Unless that motorcycle came with a kick starter in some permutation, the machining needed to fit an additional gear to the junction between the starter pinion and the flywheel would be beyond most budgets and machine shops. That is really what is needed to add a kick starter to a machine without one. Do not ask WHY manufacturers decided that the kick starter was not needed, but they all felt that way. The notable exception would have to be Ural...

Dec 01, 2014 | J&P Cycles Replica Kick Starter...

1 Answer

What is the main cause of un passing electric to start


Hi, Bijualexander and the usual suspects are:
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Discharged battery, 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.
4. Bank angle sensor tripped and ignition/light key switch not cycled to the "OFF" position and then back to the "ON" position.
5. Security alarm needs a reset.
6. Starter control circuit, relay, or solenoid faulty.
7. Faulty starter button.
8. Electric starter shaft pinion gear is not engaging or over-running starter clutch slipping.
For more information about your issue, please visit the websites below. Good luck and have nice a day.
50CC Scooter Wont start
How To Fix Scooter Starting Issues Part 1 Quick Guide
The Ultimate GY6 Starter Ignition Troubleshooting Tutorial
50cc scooter wont start need help
Scooter won start




Apr 26, 2014 | Bajaj Motorcycles

1 Answer

My 50cc yamaha wont start electronically or with kickstart...battery is charged lights working


Hi, Eric your starter motor is not/was not the problem that dubious title goes to the starter drive/Bendix/clutch which is a separate component that is activated by the starter motor it is a mechanical gear driven part that engages the clutch pack to turn over the engine. It has an internal mechanism that allows the gear to turn in one direction and once the engine starts allows the drive gear to free spin. If gear free spins in both directions then the drive gear has failed, it is not serviceable and needs to be replaced. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Starter slipping on 05 RX1 and possible cheap fix
Starter Clutch Removal avi
http://www.49ccscoot.com/manuals/Yamaha_C3_Service_Manual.pdf
OEM parts for Yamaha
Yamaha XC50Z Owner Manual

Feb 13, 2013 | 2007 Yamaha C3

1 Answer

Starter wont turn over


Most of time the reason for a chevy starter wont turn over stems from no power blown ignition fuse. Dead battery ,dirty battery cables, loose connection at the starter, bad starter solenoid or burnt starter motor.Start with easiest and cheapest things first.Check any fuses marked ignition,remove battery cables and clean with wire brush clean the battery post also. While the battery is unhooked charge and load test, check the connections at the starter. If the fuses are good and battery is ok. The cables are clean and connections are tight you will need to remove starter and solenoid and take them to be tested

Aug 11, 2012 | Haynes Chevrolet and GMC Pick-ups Repair...

1 Answer

KICK START ON BETA 125CC TRIALS BIKE HAS SEIZED BUT MOTOR FINE


Hi, Hughesthug for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your issue. For more information about your issue please visit the website below. Good luck and have a nice day.
50cc KICKSTARTER PROBLEMS AND SOLUTIONS
HOW TO CHANGE FIX HONDA MOPED KICKSTARTER GEAR 2 HOW TO FIX JAMMED DIO ANY MOPED KICK STARTER OR GEAR
http://www.lewisportusa.com/manuals.htm
http://www.betamotor.com/en/suhttp://www.lewisportusa.com/manuals.htmpport/manuals


Jun 17, 2011 | Beta 303RS 125 Motorcycles

1 Answer

Electric start on speedfight 2 wont work have installed a new battery as the bike has been standing for about a year


If it will kickstart, but the leccy foot doesn't work, make sure the brake light comes on with both front and rear brake light switches as these also function as ignition cut out switches. The switches tend to wear badly on the plungers and if the brake light don't come on you will probably have to replace. One or other of the brake lights MUST be operate before the starter will work. If these are OK, check the starter itself by use of a jumper pack or another battery and jump leads. Leave the ignition switched OFF. Negative lead to a good earth like the kickstart, touch the positive directly to the terminal on the motor, careful, not a lot of room in there, if the starter don't turn, it's probably goosed. Replace.

hope this helps

John

May 17, 2011 | Peugeot Agusta 910R Brutale Italia...

1 Answer

I have a piaggio typhoon 50 cc (1999) it starts on the kickstart and ticks over but dies when you try and rev it,It wont fire on the electric start but turns over fine.The carb is clean and the fuel...


Hi, Steviethemas before testing any electrical component in the Starter Circuit it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test because your battery may have 12.5 volts or more but little or zero amps causing the battery to be faulty and must be replaced, especially "AGM" batteries.
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Check the 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.
4. Bank angle sensor needs a reset or is faulty.
5. FOB battery low or dead.
6. Faulty ignition switch.
7. Faulty starter button.
8. Faulty kickstand or clutch pull in switch/sensor.
9. Security alarm needs a reset.
10. Starter relay, solenoid, starter have failed or circuit wiring faulty.
11. Starter armature or field coils have failed.
12. Main fuse or circuit breaker may be blown or faulty.
13. The electric starter is working but starter clutch has failed.
14. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
https://www.reddit.com/r/scooters/comments/3d1r2j/help_please_piaggio_typhoon_wont_start
Scooter Troubleshooting Scooter won start All about Scooters
http://www.49ccscoot.com/manuals/Piaggio_Tech_Manual.pdf
https://www.oemmotorparts.com/oem2.asp?M=piaggio
PIAGGIO ZIP 50 2T User Manual

May 16, 2017 | 2005 Piaggio Typhoon 50

3 Answers

Zip 100 wont start battery not flat, motor does not turn over just a clicking sound. Will start with the kick starter


Sounds like dirty terminals, start their. If that is OK, then your solenoid has crapped itself. You can clean the dirty terminals, but you will require an auto-electrician to fix the starter motor.

Jan 19, 2010 | 2005 Gilera Runner VX 125

2 Answers

2001 nissan pathfinder- car wont start


Check tightness of the clamps on battery & make sure the earth cable is tight from battery to engine, also check tightness of nut holding the cable 2 starter motor if all ok there its most probably the solenoid on top of starter motor replace this with new all will b ok.

Mar 12, 2009 | 1999 Nissan Pathfinder

Not finding what you are looking for?
50cc 4-Stroke Shortcase Engine - QMB139 Logo

86 people viewed this question

Ask a Question

Usually answered in minutes!

Top Parts for scooters Vehicle Parts & Accessories Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14337 Answers

Brad Brown

Level 3 Expert

15557 Answers

Are you a Parts for scooters Vehicle Part and Accessory Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...