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1990 Honda XR100R will not start

Just bought a 1990 Honda XR100R. It is not the motard version. Wouldn't start so I took off the carb and cleaned it up. It is now getting fuel but still won't fire. Spark plug looks good, cleaned that too. Don't know where to start with the settings of Air/fuel or idle screws. Anyone with some insight would be appreciated. @

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  • Honda Master
  • 48,513 Answers

Hi, Farfromsouth and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Quick disconnect check ball stuck.
14. Compression below 75 PSI.
15. A stuck-bent-burnt valve.
16. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
17. 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.
18. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
19. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections are loose or connected to the wrong cylinders.
20. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
21. Faulty neutral, clutch, kickstand safety switch.
22. Faulty fuel pump or fuse or relay.
23. Faulty or corroded run/stop switch.
24. Tilt sensor needs a reset.
25. Security system not disarming alarm needs a reset.
26. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
UPDATED 96 XR100 won start
http://www.motorcycleforum.com/71-honda/207690-xr100-wont-start.html
HONDA XR80R XR100R 1998 2003 WORKSHOP SERVICE REPAIR MANUAL Download... $15
https://www.partsfish.com/page/oem-parts-for-honda
Honda XR100R 1996 Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Feb 14, 2018

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Posted on Jan 02, 2017

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  • 74 Answers

SOURCE: 1995 honda cbr f3 wont start

I would think about investing in a carb re-build kit.

Posted on Dec 22, 2008

  • 1 Answer

SOURCE: 1997 cb500 won't start

finally sorted when I replaced both plugs. I've never come across one failing instantly before in 30 years of motorcycling (maybe that's because I ride old bm's!)

Posted on Feb 04, 2009

  • 72 Answers

SOURCE: 2003 honda crf230f will not start.bike worked fine

IF you have a battery get a new one ; put in new gas ; super; dsid you ajest any screws on carb. You tight need to run a prime tank right to your carb to prime it; and then hook your tank backup new gas lines to your carb. Now break out with the WD40 to spray all switches for rust.

Posted on Mar 23, 2009

  • 3567 Answers

SOURCE: bike wont start

Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean the air filter. Install a new stock NGK spark plug.

Please rate this solution. Thanks!

Posted on Apr 19, 2009

  • 6 Answers

SOURCE: honda cbr 600 wont start

hi, each lead has the specific number on it. if you do this correctly then they genrally give you an idea to where the sit in the coils( the way they bend :-) ) also i believe the coils are better off been attached to the frame once you are sure leads are in corect order and possitioned correctly in the coils.i just presumed the coils neaded earthing. make sure battery is pleny charged as a bad battery can just hinder. it is also very easy to flood the bike so just check the plugs again. if they are unusually wet then dry them off and try again . otherwise maybe try cleaning all electics.

hope this somehow helped
gavin barraclough

Posted on Apr 26, 2009

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