Does Your R "cough" When Revved From Idle?

[bobbys9350]

Just like the topic says. The quad runs great. I have a PC5 with modified GYTR map, sparks exhaust, and a filter kit. I know these quads arent made to be free revved, it just bugs me. Whenever It's at an idle and I wack it it coughs and the revs. I tried playing with the accelerator pump feature but I couldn't make it get any better. Just wondering if you guys are finding a cure to this? Thanks!

[bobbys9350]

Bump

[09RhoadzieYFZ-R]

Yeah mine does the same thing, I have a full system HMF, PC, and K&N intake. it runs awesome just while its idling and i go and smack the throttle it bogs. I was told that it means its running rich on the "light throttle" but i dont know. I havent really messed with it.

[outtagas]

is this only at idle?
remember the carbed yfz - the boyesen fixed the bog.
Does it bog if you hit a big jump - let the throttle off in the air - then hit the throttle hard as you land?- thats not fun at all if it does.
is the pc 5 all that and a bag of chips then?

[09RhoadzieYFZ-R]

yeah its only at idle for me. I have The trinity PC but its fully tunable. I just got done riding and decided to go adjust it and it was idleing a tad bit rich so i leaned it down one setting and now it idles like a champ. But it only bogs when its idleing and you hit the gas quick and hard. other than that it run beautiful.

[bobbys9350]

Yep same here.

[outtagas]

ok thanks - i have to buy a pc 5 and a pipe yet - got the k@n pro design kit in so far.

[bobbys9350]

Bump

[bobbys9350]

bump

[Gommer450r]

i have an 06 and it does it as well just wondering the same and mines totaly bone stock

[Ryan]

I know for the Carburated YFZ450's , The boyseen quickshot plate fixed my problem like night and day... Don't know about the EFI? Seems like they are purposely making them like that from the factory :confused: .

[Dave400ex]

Shouldn't be a problem when riding it, but the best way to see if you can make it better is to dyno it.

we have 2 of these bike but of course ours are fully modified with gytr heads and ex and the intake. we also have the pc5 but also have the autotuner kit which helps alot. we have these 2 items in stock if anyone needs them and when you hit the head of the throttle and it bogs it's because it's lean not rich

[09RhoadzieYFZ-R]

So if I were to adjust my PC, would I adjust the low throttle response or the amount of full available for low throttle response?

okay heres a easy way to figure it out hook up your lab top and start the bike see were it's idling. take the map from that rpm rating and that throttle percentage and increase the fuel 10% see if it help and keep doing this in a range of about probably 1500 rpms to 2500 rpm to 25% throttle

[bobbys9350]

Do you have a PC5 map for your combo you could send? how is the throttle response on your bike from an idle? Thanks

we run a gytr head thiers no way mine would even be close

[Nor-Cal Nick]

I have a 09 with the CT pipe a intake and ComV and it does the same thing. Before I installed the ComV it was really bad but it cleaned up alittle. I have not installed a tune other than what was in it out of the box (I think it has a tune already?) Who makes tunes?

Also anyone try any of the added upgrades liek the dual map switch?

the auto tuner is made by dyno jet and we have these in stock

[Nor-Cal Nick]

With the auto tuner you still need tunes right but then it just self adjusts if it needs to?

yes you need to pick a map for the mods you have and it self adjusts itself

[quadracer34]

will the auto tune only work with the PC5? or will it work with the pc3 to?

the pc 5 i'm running a combo deal until the end of the month for 500 for the pair

[quadracer34]

would you take a trade in on a pc3???? lol i dont have the money to fork out till i sell my pc3

[bobbys9350]

I tried adding some fuel off idle and it doesnt seem to help? Anyone else have suggestions?

[09RhoadzieYFZ-R]

I talked to a few mechanics and the read that Bill Balance put about 6 K into his fuel delivery system so that there is no "bog" or Cough. Iunno tho

[Seed]

HMMMMMMM im not liking what yamaha is doing. When I figure on buying a EFI Quad I shouldnt have to worry about a Bog. There quality to me is falling. EFI there should be NO bog when tuned. But from what I've seen when they are tuned they still have the bog?? Somethings definetly wrong. I dont hear of any raptor 700 having this problem. HMMMM makes me wonder.

[09RhoadzieYFZ-R]

The only bog I have is at a stand still if I bounce my thumb on the throttle. but when in gear and going it has awesome throttle response. The minute I pull out the quad never bogs

[Seed]

So does your truck/car bog when you free rev it in neutral?? NO i bet it don't. EFI should not have any bog any where when tuned. Im not doubting the the quads power or throttle response im dounting there EFI system. EFI should have great throttle response. But it shouldnt matter if youre moving or free reving it in neutral it should NEVER Bog when tuned. I think Yamaha needs to do some work on the EFI for the 450R. I don't hear of any other manufacturers having this problem with there EFI system. I'm just thinking that yamaha is getting cheaper in there products. I mean look at the frame of the YFZ450R. Its practically all Cast Aluminum which = Junk. I just think they could have done alot better and need some improvements to there EFI system. Im not doubting that there quad is not good I'm just saying for a such a big power house in this industry they went cheap. Time will tell if there new design will last.

[TWILES]

I'm going to agree with you 100%. I've been fighting the carb on my WR since I bought the bike 4 years ago. I think I've got it and then the same thing 30 minutes later. I think it has something to do with the design of the head. None of the other brands really had this problem with carbs either(bikes included). I want a new bike or quad really bad but I'm just not sold on anything out right now. They are nice but the flaws are GIANT no mater how small they seem at first. Suzuki got it right. I guess they learned from the original Quadracers. They were junk.

[09RhoadzieYFZ-R]

I do agree with you Seed. I just wish they can come up with a solution to this problem quick

[outtagas]

anyone got a solution for the neutral throttle bog with a pipe, intake, pc5?
i started mine up in the garage and i saw a 6 inch flame come out the DRD then a burp of black smoke in the first 3 seconds of my intial start up. now no flame no smoke - just a slight bog.
anyone have a good direction to try? acting too lean - can someone ask bill ballance what to do ? ha ha

[Seed]

From what ive been reading is, but dont hold me to it I need some more facts. The maps people are downloading for the power commanders are only to get you into the ball park. So your best opion is to download a map to get you close and then take it and get a full dyno tune to eliminate any lean/rich spots through out the power band. As with all motors each one will be slightly slightly different beings with the tolerences of the parts of when the motor was built. So you may be + or - on a say a port or other parts of the motor. Just remember all manufactured machines or other things that are made have a tolerence of plus or minus of so much. So its best to get a full dyno tune to perfect the air fuel mixture every where. Fuel injection is not cheap and not easy for the average person so its best to have a professional tune it, but the good thing is that once its set it is set.