20 Most Recent 1978 Suzuki GT 380 Questions & Answers


Hi, Anonymous and the usual suspects are:
1. 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.
2. 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.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system.
12. Carburetor contaminated, sticky float, plugged jets.
13. Carburetor has oil in the bowl due to excessive oil in pre-mix.
14. Carburetor vacuum diaphragm torn, cracked, not seated or installed improperly.
15. Multiple carburetors out of sync.
16. Fuel filter clogged.
17. Old or contaminated fuel.
18. Fuel tank vent system plugged or carb vent line closed off.
19. Gas cap diaphragm valve faulty.
20. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
21. Carburetor controls misadjusted.
22. Incorrect valve timing.
23. Valve springs floating, weak, or broken.
24. Damaged intake or exhaust valve.
25. Incompatible performance parts.
26. The control module may be in "LIMP" mode
27. 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.
Diagnosing Misfire or Backfire CarNewsCafe com
https://www.reddit.com/r/motorcycles/comments/d2rsb/need_some_help_with_a_suzuki_gt380_that_wont_run
https://www.oldjapanesebikes.com/mraxl_GT_Resource/manuals/gt380man/index.php
https://www.oldjapanesebikes.com/mraxl_GT_Resource/manuals/partsgt380/index.php
https://www.oldjapanesebikes.com/mraxl_GT_Resource/manuals/gt380_m_own/index.php

1978 Suzuki GT... | Answered on Mar 30, 2019


Hi, if the cable is good, I would remove the carb, unscrew the top off the carb and check to see if the slide (#8 in the picture) is caught on the guide pin inside the bore. This often happens when the carb is reassembled, but can also happen if the top was not tight and the throttle was pulled hard. If you find the slide caught on the pin, check for wear or damage that could cause this to happen again and repair as necessary. If there is no damage, let the slide down and make sure to recap the carb tightly.
If the slide is not caught on the guide pin, check for free motion of the slide. Pull it out and inspect the slide and its bore for wear, dirt, and scratches. If it's only dirty, clean it up with carb cleaner. However, if there is wear or damage that can cause the slide to stick in the bore, replace the carb.
Please let me know if you have more questions, and thanks for using FixYa.jturcotte_196.jpg

1978 Suzuki GT... | Answered on Jan 30, 2011


I would change spark pluge first.............Fire it up in the dark and make sure the bike is not jumping spark from one of the coil or spark plug wires...........Hope this helps

1978 Suzuki GT... | Answered on Aug 21, 2010


I recommend a motorcycle transmission oil as it has the proper additives for a wet clutch. I like yamaha's trans oil plus for my bikes.10w40 motor oil will do in a pinch. and I like Yamaha's Yamalube S for oil injection systems.

1978 Suzuki GT... | Answered on Jun 28, 2010


carbs really need to be inspected-a manual is a must-or a similar *** make-if oil n gas mix is rite ratio then ur ok-look at the electrical for any cuts,corrosion or looseness-no wheelies

1978 Suzuki GT... | Answered on Sep 09, 2009


Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Use Two Stroke ENGINE oil in the pump.

Top rating? Thanks!

1978 Suzuki GT... | Answered on May 25, 2009


Under well-lit conditions, look for any signs of punctures (such as nails or shards of glass) which might potentially lead to a loss of pressure or a blowout. Bulging or cracking might also occur on old tires; make sure you roll your bike forward in order to see all surface areas that come in contact with the road.

1978 Suzuki GT... | Answered on Nov 10, 2008


make sure the carbeurator's low jet is working properly and not clogged

Suzuki GT 380... | Answered on Nov 12, 2017


where is ur clymer manual used by pros--u gutta git piston at top dead center then ajust timing cam--book xplains--utube or library can help too

Suzuki GT 380... | Answered on Feb 10, 2014


im guessing that its an early model with carbs these may need a good clean you may have water or dirt in your fuel the air filter may need replacing and the spark plugs and leads. from memory its a bit of a mission removing the carbs as i remember it is easier if the air box is removed first keep all parts seperate when striping the carbs if your not confident do them one at a time so you can use the next one as a reference if you get confused as to where the parts go use carbretta cleaner and compressed air to clean with dont use wire to clean the holes in the jets. clean the outside first before you remove the float bowls and use a good screwdriver the philips head screws have a tendancy to be difficult and and its not hard to chew the centre out of the screw if this happens use a centre punch and hammer punch the head of the screw to loosen it an impact driver should undoo tight screws that are not damaged

Suzuki GT 380... | Answered on Apr 06, 2011


Hey there sorry for the late response

what do you have for a motor in the quad?

Suzuki GT 380... | Answered on Mar 27, 2011


look here :
http://www.repairmanualclub.com/motomanuals/index.php

find one thats close enough.

Suzuki GT 380... | Answered on Mar 09, 2011


Hi,

The best i could Offer you would be a Service Manual that would have all the Details :-

http://www.tradebit.com/filedetail.php/88751438-suzuki-gt380-service-repair-manual-instant-download

The price is as low as $9.95 as compared to some other sites asking for more than $ 30 - $ 40.

Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Suzuki GT 380... | Answered on Feb 28, 2010


First of all, you want the light to go on, not off.
The idea is that the spark is supposed to happen when the points open.
When the points open, then the current is no longer being grounded away through them, and then you will again get power on the negative of the coil.
In theory the coil could fire when points both open and close.
But you can't operate the coil from when the points close, because it takes too long for the coil to build up voltage. But is can quickly discharge the voltage when the points open.
The purpose of the condenser capacitor, is to essentially eliminate the closing spark completely. So you only get a coil discharge when the points open, removing the ground connection.

Suzuki GT 380... | Answered on Feb 17, 2010


a shop that makes exhausts like mineke should be able to fix what u need they could probably bend a whole new set or maybe just fix the problem u have with them.

Suzuki GT 380... | Answered on Oct 13, 2009


if the battery is more than a few yrs old its probably no good. check charged voltage . it should be at least 12.4 volts at rest. after its charged up. if not time for a new one.

Suzuki... | Answered on Oct 20, 2019


What cc is it ?

Suzuki... | Answered on Oct 01, 2019


Go to Google and type 85 Suzuki murader Factory service manual PDF download. Look for a sight called manuallib. Factory service manuals are free online for bikes of you know where to look it will detailed description with pics on what you need to know.

Suzuki... | Answered on Sep 29, 2019


Hi, Frank and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
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://thumpertalk.com/forums/topic/1024676-rm125-cant-rev-into-powerband/
https://singletrackworld.com/forum/topic/motorcycle-wont-rev-above-3500-rpm-please-help/
http://www.crservice.dk/Suzuki%20cross/RM125/RM125K7_01A.pdf
https://www.partsfish.com/page/oem-parts-for-suzuki
http://mybikemanuals.com/suzuki/

Suzuki... | Answered on Sep 26, 2019


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Suzuki... | Answered on Sep 23, 2019

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