Pressure behind carb

Posts : 12 Join date : 2013-07-29

Hey guys i have an 06 660 rhino. I am have problems with the rubber boot connecting the carb to the intake manifold blowing off due to pressure build up. Does anyone have any suggestions. Please help

Posts : 64 Join date : 2013-04-22 Location : South Okanagan

I saw that problem on a Raptor 660 when the air box was modded and caused it to run lean. It would backfire and blow the carbs off. Richened up the jetting and all was good.

Posts : 12 Join date : 2013-07-29

Sounds like same problem but my bike is stock.would it help if i rejetted?

Posts : 12 Join date : 2013-07-29

It also just generally runs like crap at idle and out the hole

Posts : 12 Join date : 2013-07-29

Can anyone tell me what jet i should be running on my bike

Subject: Re: Pressure behind carb Mon Jul 29, 2013 10:23 pm

What shape is your exhaust in ? Does it back fire on declaration ?

Posts : 12 Join date : 2013-07-29

Factory exhaust but the baffle is removed. It does not backfire on deceleration.

Posts : 64 Join date : 2013-04-22 Location : South Okanagan

I would definitely open up the carb and see if it's dirty, there could be a restriction from that.
Have you owned it since new or is it new to you? Possibly someone else changed something before you got it. Check what's in there for jets, should be 150 main and a 40 pilot jet. About 1.5-2 turns out on the mixture screw will be close enough for it to run proper

Posts : 789 Join date : 2013-03-10 Age : 70 Location : oHio

are you sure that "pressure" is blowing the air cleaner off the carb?
there should be no reverse pressure from the intake to blow it off.
is it fastened securely?

Posts : 12 Join date : 2013-07-29

I have refastened it several times but it always comes off i will have to take carb down and look at it

Posts : 12 Join date : 2013-07-29

How do you know what size jets are in the carb?

Posts : 64 Join date : 2013-04-22 Location : South Okanagan

The numbers are stamped right on them, maybe need a magnifier to read them but they will be there

Subject: Re: Pressure behind carb Tue Jul 30, 2013 4:24 pm

check motor mounts and where they mount for cracks...clean both surfaces with alcohol so it wont slip

Posts : 12 Join date : 2013-07-29

I wonder if i should just buy rebuild kit from james

Posts : 12 Join date : 2013-07-29

It looks like i have a 145 and a 40 is this factory? What should i have?

Subject: Re: Pressure behind carb Mon Aug 05, 2013 9:23 pm

Is this completely stock with the 660 air box in place?

Posts : 12 Join date : 2013-07-29

Yeh it is all stock

Subject: Re: Pressure behind carb Mon Aug 05, 2013 10:46 pm

Check your valve adjustment,could be that the intake valves are not closing all the way,then when it comes to the compression stroke its blowing compression back to the carb.just tring to figure this out.

Posts : 12 Join date : 2013-07-29

Where can i found the valve specs?

Subject: Re: Pressure behind carb Tue Aug 06, 2013 8:43 am

.008 INTAKE .010 EXHAUST

Posts : 12 Join date : 2013-07-29

Ok i tore down the carb and cleaned it and went ahead and ordered new jets. After inspecting everything i noticed that the boot on top of the carb slide has a hole in it. Could this cause my problem?

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