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Makita 4 Cycle Trimmer - any mechanics on here? #4425938
06/08/17 01:30 PM
06/08/17 01:30 PM
Joined: Dec 2016
Posts: 74
Midwest
Rab6715 Offline OP
Rab6715  Offline OP
Joined: Dec 2016
Posts: 74
Midwest
Hey small engine shade tree mechanics and professionals -
I have a 2.5 year old Makita trimmer with low hours - maybe 10. Its a 4 cycle, separate gas/oil, not a 4-mix. This year it developed a problem where it became hard to restart hot and if i got it going, it would idle out and die. When cold, it starts first pull, it idles well when cold and has amazing power. If i shut it off for 15-20 min, restarting is only made by holding down the throttle and pulling. If i get it going then, it will then idle out. Things I have done so far:

1. Adjusted idle screw - I have a tachometer
2. Adjusted/checked valve lash - they are perfect
3. Spark arrester was removed day one of ownership
4. Oil is clean
5. Air filters are clean
6. Carb body and related gaskets appear tight and clean
7. I metered resistance of coil its within spec. I have not done this when its hot, will this make a difference?
8. Thought it was venting problem, removing gas gap - no improvement
9. Took it to local mechanic, who said it was idle screw wiggling and getting out of adjustment, so I put some loctite on the screw to hold it down. I used low strength locktite, but it made no difference for hot restart problems.
10. NEw spark plug with correct gap made no difference.

I'm at a loss for what it could be. I'm close to buying a new carb, but they are like $50 and I really don't think its the carb. The carb is not adjustable since its a 4 cycle. Any other suggestions for me? I love this trimmer, but its giving me a headache with this problem. This is a professional model and cost about $300 new, so i'd like to fix it.

Any ideas? Thanks so much


Last edited by Rab6715; 06/08/17 01:32 PM.
Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4425958
06/08/17 01:53 PM
06/08/17 01:53 PM
Joined: Jun 2002
Posts: 6,353
MI
doitmyself Offline
doitmyself  Offline
Joined: Jun 2002
Posts: 6,353
MI
Man, you've done some excellent diagnostic work there and have covered a lot of possibilities. Many years ago I did have a situation where the coil acted up only when warm. This article talks about it some: http://www.your-lawn-care-basics-coach.com/Lawn-Mower-wont-start-when-hot.html

It sure seems to be temperature related. Is a carb kit available...they tend to be very inexpensive. Fuel line and filter are good?

Hopefully someone else with more experience will chime in.

Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4425968
06/08/17 01:57 PM
06/08/17 01:57 PM
Joined: Feb 2015
Posts: 2,202
Slovenia EU
Kamele0N Offline
Kamele0N  Offline
Joined: Feb 2015
Posts: 2,202
Slovenia EU
Check if there is any air leak between carburetor and cylinder...spray wd40 in between when it will be running...if engine will quit...then it is gasket...


2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
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Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4425971
06/08/17 02:03 PM
06/08/17 02:03 PM
Joined: Jul 2011
Posts: 259
SE Michigan
MichiganMadMan Offline
MichiganMadMan  Offline
Joined: Jul 2011
Posts: 259
SE Michigan
Any chance it is running on winter fuel?

Years ago I came home on a unusually warm spring day to find all my gas cans looking like weeble-wobbles in my garage from all the butane trying to return to the atmosphere and bloating the gas cans from the vapor pressure. You can get vapor lock with winter fuel in summer stuff, so I dump it all before mowing season starts.


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Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: doitmyself] #4425981
06/08/17 02:18 PM
06/08/17 02:18 PM
Joined: Jul 2014
Posts: 10
Alabama, USA
m21bmr Offline
m21bmr  Offline
Joined: Jul 2014
Posts: 10
Alabama, USA
Like doitmyself, I would guess it might be ignition coil. I once had a 2-cycle Homelite hedge trimmer that would start and run well when cold, but once it was warm it was almost impossible to get restarted. I don't remember it dying while running, but if you shut it off, or ran it out of fuel, much of the time it had to cool off before it would restart.
I eventually swapped another ignition coil on the engine, and the hot start problem went away. You might check with your dealer. Sometimes manufacturers have a longer warranty on the ignition system.
Good luck getting it running well again.

Last edited by m21bmr; 06/08/17 02:19 PM.
Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Kamele0N] #4426010
06/08/17 02:59 PM
06/08/17 02:59 PM
Joined: Dec 2016
Posts: 74
Midwest
Rab6715 Offline OP
Rab6715  Offline OP
Joined: Dec 2016
Posts: 74
Midwest
Originally Posted By: Kamele0N
Check if there is any air leak between carburetor and cylinder...spray wd40 in between when it will be running...if engine will quit...then it is gasket...


Thanks ill try that

Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: MichiganMadMan] #4426011
06/08/17 02:59 PM
06/08/17 02:59 PM
Joined: Dec 2016
Posts: 74
Midwest
Rab6715 Offline OP
Rab6715  Offline OP
Joined: Dec 2016
Posts: 74
Midwest
Originally Posted By: MichiganMadMan
Any chance it is running on winter fuel?

Years ago I came home on a unusually warm spring day to find all my gas cans looking like weeble-wobbles in my garage from all the butane trying to return to the atmosphere and bloating the gas cans from the vapor pressure. You can get vapor lock with winter fuel in summer stuff, so I dump it all before mowing season starts.


Fuel was pumped in April 2017, I always mix stabil with fresh fuel when its pumped.

Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: m21bmr] #4426012
06/08/17 03:01 PM
06/08/17 03:01 PM
Joined: Dec 2016
Posts: 74
Midwest
Rab6715 Offline OP
Rab6715  Offline OP
Joined: Dec 2016
Posts: 74
Midwest
T
Originally Posted By: m21bmr
Like doitmyself, I would guess it might be ignition coil. I once had a 2-cycle Homelite hedge trimmer that would start and run well when cold, but once it was warm it was almost impossible to get restarted. I don't remember it dying while running, but if you shut it off, or ran it out of fuel, much of the time it had to cool off before it would restart.
I eventually swapped another ignition coil on the engine, and the hot start problem went away. You might check with your dealer. Sometimes manufacturers have a longer warranty on the ignition system.
Good luck getting it running well again.


Thanks. I might meter the coil when warm to see what resistance it has. The normal warranty is only 2 years, but your right for the coil it might be longer...

Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4426051
06/08/17 04:07 PM
06/08/17 04:07 PM
Joined: Sep 2016
Posts: 1,418
Minnesota
bioburner Offline
bioburner  Offline
Joined: Sep 2016
Posts: 1,418
Minnesota
I have a 2 cycle lawnboy mower that when the coil starts getting weak will do as your Makita. I have replaced the coil now 3 times since I bought it in 2003



97 Ford E350 D,99 F350 dually D
13 Scion Xb
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Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4426087
06/08/17 04:48 PM
06/08/17 04:48 PM
Joined: Jan 2009
Posts: 2,379
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,379
wi
Coil

Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: bioburner] #4426090
06/08/17 04:51 PM
06/08/17 04:51 PM
Joined: Jan 2009
Posts: 2,379
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,379
wi
Originally Posted By: bioburner
I have a 2 cycle lawnboy mower that when the coil starts getting weak will do as your Makita. I have replaced the coil now 3 times since I bought it in 2003
lol just delivered in my hands today coil for my lawn boy it's on its 3rd one quick simple job at least.

Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4426121
06/08/17 05:39 PM
06/08/17 05:39 PM
Joined: Dec 2016
Posts: 6,262
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,262
Waco, TX
Two year old Jonsered CS2245 and I just replaced it's coil. Very bummed about that!!!


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4426456
06/09/17 02:15 AM
06/09/17 02:15 AM
Joined: Aug 2003
Posts: 458
Ga
Buzzsaw Offline
Buzzsaw  Offline
Joined: Aug 2003
Posts: 458
Ga
I'd say bad coil.

Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: Rab6715] #4426645
06/09/17 09:30 AM
06/09/17 09:30 AM
Joined: Feb 2007
Posts: 3,647
Southeast
meep Offline
meep  Offline
Joined: Feb 2007
Posts: 3,647
Southeast
what are the chances it's running rich/flooded on hot restart?


2018 F150
2015 crv (wifey!)
Re: Makita 4 Cycle Trimmer - any mechanics on here? [Re: meep] #4426753
06/09/17 11:32 AM
06/09/17 11:32 AM
Joined: Dec 2016
Posts: 74
Midwest
Rab6715 Offline OP
Rab6715  Offline OP
Joined: Dec 2016
Posts: 74
Midwest
Originally Posted By: meep
what are the chances it's running rich/flooded on hot restart?


Its possible, however, since the carb is not adjustable there is no way for me to test this. I looked at coils, they are surprisingly cheap for this unit, around $15.00 I thought they would be like $40-50. I'm either going to replace the carb or the coil. I might start with the coil replacement since that is going to be cheaper. Is possible i need to adjust the needle in the carb. I might check that prior to ordering a coil. Seems odd that it would only flood when warmed up? I would think it would flood it right away, but it runs fine on cold starts...

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