[Isitamonster]

Hi I'm new to the Forum I'm hoping to pick up a Grom this weekend I was talking to the dealer and he said that he has had 3 come back with blown heads from running too lean from people modifying the airbox so they have to check for tampering and it voids the warranty if any bolt is removed. That worries me because one of the first things I was planning on doing was modding the airbox, also I was thinking about a Two Brothers S1R exhaust for it. Would this lean it out too much and should I get an EFI controller of any sort? I'm new to tuning and motorcycles in general I'm hoping to make this my first and enjoy it. Thanks in advance guys.

 

[Wildhorse1966]

sounds like someone is blowing smoke up your arse .. the ecu will compensate for it

 

[Isitamonster]

That's what I was thinking just unhook the battery for a few minutes and that will reset it right? I think the guy I was talking to had something against Groms he was saying he "didnt understand why there was such a cult following and why people try to make them sport bikes, if they want sport bikes they should buy a bigger sports bike."

 

[Strokd_GE]

I've yet to hear of one pop with an intake and exhaust let alone just the intake

Also what is a "blown head" ?

 

[Isitamonster]

Thanks, that is reassuring, another novice question here but would there be any gains speed wise from those two minor mods?

and I'm not sure that is how he worded it, I just kinda assumed he meant the cylinder head.

 

[forkseal]

I did uni filter on throttle body and full yosh exhaust. Mine def ran very lean.so i bought ejk tuner and fixed the problem.

 

[dlakerguy]

How do you know if it is running lean?


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[forkseal]

Spark plug sir. Not my first rodeo.

 

[forkseal]

Its was pretty white the prong itself was the whitest

 

[CiscoSanJose]

spark plug color tell a lot on what your engine is doing or not doing.

 

[dlakerguy]

So can you give me an example of what a good color is vs a bad color?

 

[forkseal]

White is lean thats bad brown is great black is ok but rich still better than lean

 

[dlakerguy]

I will be doing re-lubing my chain this weekend. I guess I should take my spark plug out and check it out then too. Now which plug on the motor is the spark plug? Also, should I unplug my battery and replug it in to do a reset like some say? I recently installed the KNR1100 and removed the airbox.

 

[forkseal]

Spark plug is by your right leg its a 5/8 socket dont overtighten. Or crossthread dont force it

 

[dlakerguy]

Will a regular socket fit it? I just pull the rubber piece off it? Only spark plugs I have ever removed are on my old truck and those just pulled off if I remember right. Not sure if bikes are the same way.

 

[Top Gromen]

Same. Just yank the plug wire & cap off and unscrew the thing. Also I don't think simply disconnecting the battery resets the ECU, there is a special procedure in your manual.

 

[dlakerguy]

Same. Just yank the plug wire & cap off and unscrew the thing. Also I don't think simply disconnecting the battery resets the ECU, there is a special procedure in your manual.

Ok, I'll read into that then. Is that supposed to recalibrate the air/fuel mixture ratio or something?

 

[Top Gromen]

It basically wipes its memory so it doesn't know anything then it gradually re-learns your riding habits and adjusts fueling accordingly.

 

[dlakerguy]

After 1000 miles. I assume this isn't that great. Does this look like it could be running lean though?

 

[CiscoSanJose]

View attachment 10183 View attachment 10184 View attachment 10185

After 1000 miles. I assume this isn't that great. Does this look like it could be running lean though?

Looks about right to me, if you see white ash like color it is lean, if the porcelain looks a little brown you are ok, if black you are running rich.