Full Version: Yfz450 Electrical Problems?
I've read on yfz sites that people are having problems with the system charging. Some prople run with there lights on the keep the battery from dying. There is also a stator and rectifier kit that trailtech sells that is supposed to solve the problem. Has anyone experienced this problem. I've never run my lights on during the day and haven't had a problem yet.
no i have one also.. never had this problem..starts every time
I've never had the problem yet. Fires right up, even after sitting for weeks at a time.
I heard that the batteries die, i havent heard anything else besides them being fast 
Ya if you leave the key on the ON position. When you're not riding just turn the key to the OFF position and you'll never have a problem.
I never had a problem....yfz4kt got what I think is a weak battery in his..and had a couple issues with battery charge. From what I've read, this was an issue in some of the earlier production models, but the later units were supposed to have it resolved.
after mine sits for a long time...it still fires right up no problems
I've heard of the problems too.. Apparently they were overcharging and killing the battery(hence leaving the lights on all the time), but sposedly yamaha fixed it..
What about battery problems??? This made me want a 450r instead.. i dont care if the 450r is slower!
That picture came from a Honda web site, of course it's going to make Yamaha look bad. Yamaha web sites have the same stuff on Honda bikes. You never know what the people did to the bikes to make them catch on fire, wheels fly off, swing arm busting, etc.... This stuff can happen to any bike that is not taken care of properly. It's just like saying: I saw a Chevy on the side of the road that caught fire so I'm never going to own a Chevy.
That first didnt come from a honda website buddy. Just some one took the picture from a honda website and edited it so it said that.. THAT was a battery problem (which yfz's have been KNOWN for so far).. which caught the bike on fire, WHO in the right mind would just "Catch" there bike on fire after spending 7k on it.
In the upper left hand corner of the picture: it says EXRIDERS.COM, which is a Honda Forum for Honda riders. Just like Yamaha has a Forum called YFZCentral.com. If you go there, you will see the same type of stuff on the Honda TRX450R. How do you know they didn't just clean the carb, put a fuel filter on, change the spark plug (which requires removal of the gas tank), etc.... All I'm saying is you can't go by a picture somebody has. All bikes can do that and all bikes have problems. The FYZ450 and the TRX450R are new and have different problems. A battery overcharging won't start a fire. It takes an arc between the +and-, which wouldn't happen unless you mess with it.
I've ridden a production YFZ since September and haven't had a problem with my battery once. I know a couple top level racers that were taking the battery and electric starters off to save some weight, and they had ignition problems, something about the CDI and stator not having enough juice without the battery and the bikes would cut out and run crappy.
And SmOk3d, I know of that bike pictured and as far as I and anybody at Yamaha knows, that's the only YFZ to burn like that. To my knowledge the other 19,000 plus YFZ owners in the US are very happy.
And SmOk3d, I know of that bike pictured and as far as I and anybody at Yamaha knows, that's the only YFZ to burn like that. To my knowledge the other 19,000 plus YFZ owners in the US are very happy.
They may be happy.. I admit the bike is VERY fast, i want to ride one but i dont have the gutts to ride other peoples bikes. I've seen them run, and Im very happy with them, also seen 450rs run, nice bikes too. Me personally want a 450r just because I believe they spent more time working on the bike, making it work right without problems.. while yamaha puts it out and waits for problems to arise and then fixes it on their later models.
you will find a good explaination of this issue at www.douggust.com/atv2.htm
I'll give you that one. It is definitely personal opinion on which bike they want. I personally think both bikes are great. I'm a Yamaha rider, I've always had great luck with them.
I have had no electrical problems with any of mine (now up to three.)
JFYI, there were also some pics about the Honda's kick starter grenading the cases.
Does the owner of the burned Yam park close to the fire pit?
JFYI, there were also some pics about the Honda's kick starter grenading the cases.
Does the owner of the burned Yam park close to the fire pit?
A couple people on this board already know this but I work for Yamaha as a test rider on all YZ motorcycles and had a part in the testing of the YFZ. I'll tell you this, I personally participated in the testing of the YFZ for almost two years before it's release, and that was just the testing that went on in the US. That's what I have to say about someone thinking that Yamaha just puts out a new model and fixes the problems in the following years.
By the way, the word behind the scenes before it's release was that the new Honda was going to be a revised 400ex and when Yamaha released their YFZ Honda had to throw a 450 in it to TRY and keep up with the competition.
By the way, the word behind the scenes before it's release was that the new Honda was going to be a revised 400ex and when Yamaha released their YFZ Honda had to throw a 450 in it to TRY and keep up with the competition.
dustin...interesting. Can you talk about your testing experience with the yfz? How did it change over the two years you tested it? What didn't they change that you personally thought might have improved it?
The YFZ was actually a difficult bike to test. See usually we can ride the competitors bikes and what we try to do is make our machine better in every aspect. The problem with the YFZ was that the first time I rode it, it was already head and shoulders above the bikes we were comparing it to...(Raptor, Banshee, 400ex, z400, Cannondale and a mx modified raptor) so the challenge was to make it the best "race inspired sport quad" that we could. Believe it or not we actually worked with Dunlop for months just dialing in the tire combo to make the bike slide good but still have good traction when you needed it. We even spent some time out at Glamis for a mid week trip...(Funny side note... we parked at Osborn and actually had a guy approach us and tell us all the cool stuff his buddy did to his RAPTOR to make it better, good thing he didn't really know what he was looking at.)
The only things that I would have liked to see changed that didn't happen were a more comfortable seat and better rear brakes, other than that I just wanted them to hurry up and release the bike so I could tell everybody about it and have one of my own.
The only things that I would have liked to see changed that didn't happen were a more comfortable seat and better rear brakes, other than that I just wanted them to hurry up and release the bike so I could tell everybody about it and have one of my own.
Yeah I have the (weak) battery problem, however the dealer ordered me a new one and they are going to replace it next month.......oh did I say for FREE.......and they are going to service it for the same price while it is in the shop..... 
Sounds good.. yzf's are FAST for sure.. watched some videos on one, how do they feel though for a bigger rider?? I heard they were a little lower.. i'm 5'6, 290lbs and throwing a bike around is no problem but i want to feel comfortable on it (main aspect over power)
I bought my YFZ in early Sept '03, never had a problem with the battery, now jetting it to get rid of the glowing head pipe was a different story, but I figured it out.
| QUOTE (Screamin Ian @ Jul 30 2004, 09:40 PM) |
| I bought my YFZ in early Sept '03, never had a problem with the battery, now jetting it to get rid of the glowing head pipe was a different story, but I figured it out. |
I just used it as a night light....
Damn that thread was all over the place 
Sm0k3d the only way a YFZ might feel cramped is if your really tall. If your 5'6" I wouldn't think that you would have a problem.
I'm 6'2" and I don't feel cramped at all.
6'3 and feels good. At first it fely small against my banshee but after raising the bars up an inch it felt good.
It works for me, but then I am only about 5'9"
I'm 6'2" and it feel fine. I never even changed the handle bar position.
| QUOTE |
YFZ450 Tech More Juice for Quicker Starts YFZ450 Battery Fix by Justin Waters • July 2004 We have come to love that push button start in the YFZ450. We know we could save a couple pounds by switching to a kick start system but we just can't pry ourselves away from that handy little buttun. That said, you better make sure you have a good battery to back it up or else you will find yourself with a tow strap trying to find someone to give you a tug off the start line... A number of our readers have complained of battery issues on the YFZ450 and we ran into the same thing on ours. The first problem we had was the battery going dead. We could charge it for hours on end, and we'd go out into the garage to ride and the battery would barely have enough power to turn the engine over. After doing some research on this issue we decided to not just replace the battery but replace with one that has a little more juice than the factory unit. For some help we turned to YUSA. We found that the CBR600 YTZ10S has the same height and length, but was 7/8" wider. Check out the specs below: YUSA Stock- YT7B-BS -- CBR600- YTZ10S Voltage 12 -- 12 Capacity 6.5 -- 8.6 Dimensions 6" x 2 9/16" x 3 11/16" -- 6" x 3 7/16" x 3 11/16" Weight 5.0 lbs -- 7.0 lbs Amps 0.7 -- 0.9 C.C.A 85 -- 190 Did you notice the difference in the Cold Cranking Amps (C.C.A.)? That is a huge difference and will help turn the YFZ450 over quicker and easier than the stock system. Those dead engine starts will be that much quicker and if you happen to stall it out on the race course, you can be assured your going to get it restarted. Installation To get this battery to fit, the plastic divider behind the stock battery had to be cut out to allow for the extra 7/8". We did this with a dremmel and side-cutting pliers. This took some time to get it trimmed out. (If you know of an easier way to do it, please let us know.) It didn't look perfect after we were done with it, but that's better than not being able to use your brand new quad because of a dead or low battery, right? I would guess we spent a good hour trimming the plastic. After the plastic is all trimmed out, the new battery slides right down in with a nice tight fit. This is the battery compartment BEFORE This is the battery compartment AFTER This is the battery compartment with the stock battery. This is the battery compartment with the YUASA YTZ10S Summary Our YFZ450 now starts easier and faster thanks to YUASA. The only down sides to installing this larger battery is that you have to cut your plastic, and it weighs 2 lbs more than the stock YFZ battery. See you on the race course ... • Contact Information YUASA Battery Inc. Reading, PA 1-866-431-4784 |
| QUOTE |
YFZ450 Tech Head Plug Fix by Dean Waters • July 2004 It can easily ruin a day of riding when you're cruising along and suddenly notice oil spurting everywhere around the front of your YFZ450 motor. We show you how to FIX that problem before it happens. This is the bolt that holds the new billet plug in the head. We would show you the original plug BUT ours blew out on the trail somewhere. Since this motor originated in a dirtbike, the YFZ's have a place for a manual compression release built into the motor. But since you don't need it, there is a plug put in the hole. Quite a few people (us included) have had this plug blow out while riding. It spews oil all over your leg and the quad, and if you don't notice it in time, it will blow out enough oil to possibly hurt your motor. We recomend you fix it BEFORE it happens to you. GT Thunder makes a billet aluminum plug that can be used to replace the stock one. It takes just one bolt to remove the stock plug, you push in the new billet plug, and put the screw back in. It's as simple as that. The bolt is pretty small, so be sure that you don't over tighten it and snap it or strip the head. • Contact Information GT Thunder 6748 TR 630 Millersburg, OH 44654 330-674-7122 www.gtthunder.com |
| QUOTE (sicaz shee @ Jul 31 2004, 08:20 PM) |
| 6'3 and feels good. At first it fely small against my banshee but after raising the bars up an inch it felt good. |
Did you put on a +1 steering stem or just get taller bars? What kind of bar set up are you using?
I just did the trailtech set up which is 1 inch taller. Looks good and works great.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please click here.