[GobblinGrizz03]

I recently installed the intake and UNI filter. I love the new setup. The only question I have is how much of an issue is the AIS system and crankcase vent now being open to unfiltered air? The stock setup drew filtered air into the sealed chamber in the front of the box.

 

[Grizzcrazy]

I would say that it's not a problem. Since it's this way in many previous grizzlys.

 

[RDC]

I recently installed the intake and UNI filter. I love the new setup. The only question I have is how much of an issue is the AIS system and crankcase vent now being open to unfiltered air? The stock setup drew filtered air into the sealed chamber in the front of the box.

There should be no issue at all but I would block off the ASI, ( AIS causes backfiring issues ) I used a bypass cap 1/2” ID at the air box and slide the hose back on and reattached the clamp. You can get the bypass caps at any automotive parts store, usually in a small assortment from 3/8 to 3/4. I am thinking that you think the ASI or crankcase is drawing air when instead it is putting exhaust admissions back into the air box to re-burn excess gases. I even put a piece of prefilter cloth over the original air intake of the airbox to help to stop debris from getting in that space your concerned about. EHS sent me two little pieces of open cell foam that came with my kit to place in the top of the Chambers you are talking about. I opted not to use the foam. I hope I am reading your post correctly?

 

[GobblinGrizz03]

Yes, that makes sense. Thank you

 

[possume22]

[QUOTE. EHS sent me two little pieces of open cell foam that came with my kit to place in the top of the Chambers you are talking about. [/QUOTE]

I thought that is where the foam went but didn't show in the instructions so I left it out

 

[Redmud1]

Does any one know what the K&N Air filter model is for the EHS racing Air box mod? Specifically the 2016-2018 Yamaha Grizzly 700 version?

Also in response to comments above: I have 2 small pieces of foam fitted at the front of the air-box to provide some cleaning to the air that is sucked into the small pipes at the front of the box. It is not fullproof and i have quite a lot of dust building up around the edges of the foam. I will be looking at removing the plastic plate from the original air-box and sealing it into place on my EHS air-box instead of the foam. I will report back later on how effective/practical that is.

I have included a couple of photos hope it helps.

Thanks

 

[Redmud1]

I have made a short film about my experiences with the EHS Racing airbox mod over the last year.

https://m.youtube.com/watch?v=veDjwdE0AZQ

 

[RedRocket]

@Redmud1, request to see some pictures of what you're riding in Zambia!

 

[guipago]

Clipping the original cover back on looks like it's the go, as far as the K&N filter is concerned, get a couple of spares ready to use (cleaning solvent & filter oil as well) because they clog up with that fine dust(we call it Bulldust) real quick, they are a great filter for road & heavier dirt use but fine dust is their downfall. I used K&N on my bikes when I lived in the city, I now live down a 8km dirt 4wd track it's all foam filters now.

 

[Redmud1]

A couple of people have advised me to use the foam Uni Filter given the Bulldust we have to contend with. I think i will get one and try it out see if it makes a difference with the horses. That s the beauty of the EHS mod, filter types are easily interchangeable.

 

[Redmud1]

@Redmud1, request to see some pictures of what you're riding in Zambia!

Hi RedRocket,

I also have a walk around video of my ride available on Youtube. Unfortunately i cant seem to post a link for you here. i get an automated message saying i can't post links because i haven't made 10 posts yet.

But if you search on you tube for something like: RedMud Grizzly 700

you should find my channel.

Cheers

 

[guipago]

Unfortunately, you won't gain anything with the foam filter, you will get more surface area for air filtration, it won't clog as fast & I find them easier to clean.

 

[RedRocket]

Hi RedRocket,

I also have a walk around video of my ride available on Youtube. Unfortunately i cant seem to post a link for you here. i get an automated message saying i can't post links because i haven't made 10 posts yet.

But if you search on you tube for something like: RedMud Grizzly 700

you should find my channel.

Cheers

Yes, saw that. Make sure next time you're out riding to take some photos or video. Would love to see some pictures from out there. Thx.

BTW, looks like you now have 10 posts so you should be able to post links/pictures without issue.

 

[jparacing]

I have drilled two 10mm holes from the chamber that the air temp sensor is placed on my ehs airbox with uni filter, just to get the air flows around the the sensor as I dont have the ais thats flows air around the sensor anymore.

My bike dosent seems to backfire as bad as it did before the holes.
Guess the air stand still in the chamber and threat the sensor that's the air is hotter then it actual is.

 

[EHSRACING]

You can not seal the compartment without venting it or you will have a major issue. The hose to the top of the head is the crank case vent if it is obstructed it's far worse than running with no air filter at all. It has many bad side effects. It does not matter if the front gets dusty it is a vent and it will not move dust inwards

 

[jparacing]

If your answer is to me, I dont have the tops on the two chambers, crancase went flow free.
Just made two 10mm holes two the left side chamber to let the air vent around where the temp sensor sits.
Otherwise, I cant see how the air will vent in the chamber without the ais even if the top is removed.

 

[EHSRACING]

The video said they were going to try and seal up the top again. The new OEM boxes we get from Yamaha come with the top open like we did/do for awhile now I'm thinking Yamaha maybe realized they could have venting issues as well.

 

[jparacing]

Here is a pics of where I drilled the two 10mm holes to let the air circulate in the left chamber around the sensor.

 

[EHSRACING]

that is fine yamaha temp sensors are fairly forgiving and only alter fuel by pretty small % i just didnt want someone to watch video and seal that area off thinking dirt would get back into there motor without proper venting you can actually toast a crankshaft fairly quickly.

as long as the temp sensor is within 20 degrees of actually air temp it shouldnt really effect anything

 

[jparacing]

Thank's for the clearyfication about the temp sensor Eric.
Now I seen the vid, and see the problem.

Personally I have always build my two wheel bikes with open crancase vent over the years to not draw oil gases into the throttlebody/carb.

Did the airbox mod change anything regards the settings on the controler?

I see it as just a dustproof filtration that use more of the airfilter surface.