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montesa 4RT killing plug's???????
Posted: Mon Sep 06, 2010 7:44 pm
by antpoo69
i've been riding my 4RT for about a year and a half now. all of a sudden it has started to go through plugs like they are going out of style..... the standard plug is a CR6EH-9. i have run the standard plug and the CR7EH-9 and it has been killing them as well. just wondering if anyone has any idea why it has started doing this.
i don't really know too much tecnical stuff about these motors so hoping it's something that's easy to sort out.
Re: montesa 4RT killing plug's???????
Posted: Mon Sep 06, 2010 8:32 pm
by anthonyc
A CR7EH-9 is a colder plug so it will foul if you are fouling CR6EH-9!!!!
Re: montesa 4RT killing plug's???????
Posted: Mon Sep 06, 2010 8:37 pm
by antpoo69
so does that mean i should be trying a CR5EH-9 or should i try to work out why the problem has started all of a sudden? would the hotter plug solve my problems?
Re: montesa 4RT killing plug's???????
Posted: Tue Sep 07, 2010 12:28 pm
by Stork955
Gday, what do you mean by eating plugs? Are they getting fouled? (Black deposits on the tip)? If so, there are a few possibles causes. In no order - Air filter blocked, exhaust damaged or blocked (unusual for a 4 stroke) Too rich fuel for some reason -failed coolant temp sensor etc, faulty injector dribbling, oil consumption (rings/piston etc). This will do to get started with.
Cheers,
Stork
Re: montesa 4RT killing plug's???????
Posted: Wed Sep 08, 2010 8:45 pm
by bgradesherco
I've been running a CR5 in mine for a few months now with no dramas, give that a try Andrew.
Re: montesa 4RT killing plug's???????
Posted: Wed Sep 08, 2010 9:16 pm
by antpoo69
no worries... i'll give that a try... hopefully that fixes it. an easy fix like that sounds a lot better than all the other idea's stork955 has
thanks stork955 btw. if they plug doesn't fix it i'll have to work my way through your list of suggestions.
cheers
Re: montesa 4RT killing plug's???????
Posted: Mon Sep 13, 2010 9:58 pm
by sjj220
This was a simple solution to my plug problem, it may be of help.
Had similar problem a while back with my 07 4RT, at times it would foul a plug after one riding session. On some advice from another rider, I found that I had been over oiling the air filter and this caused the standard plugs to foul.
Now I only use a minimum of oil and clean the filter regularly (having a spare air filter makes life easier). If in doubt ring or email Montesa - Tarp Hassinen.