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Discussion Starter · #1 ·
Alright, this weekend i went riding any my foreman started back firing really bad and if i pressed the throttle it would bog down. We let it sit for a while and it was really hard to start back and i ran fine. We got it back to the shop and then it wouldnt start at all. We checked to see if it was sparking and its not. So far we have changed the plug and even took another coil off a junk fourwheeler. Still nothing. If you crank it over for about 30 secs it will hit once but thats it. We also know its getting gas. What could be the problem. Im stuck
 

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Discussion Starter · #3 ·
Thanks but we already checked all the fuses and we've tried two dif coils so far. We know the second one worked because the junk fourwheeler just had a blown motor not to long ago. I think it might be the cdi im getting another one of them tomorrow. If its not that im gonna try bypassing the kill switch
 

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Discussion Starter · #4 ·
Well i tried the new cdi box today and still nothing... Im thinkin its the kill switch because i actually hit it by accident about 30 mins before it started acting up so ill have to try that this weekend
 

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plug wire?

r u using different plug wire w/other coils or orignial. also the boot that covers the spark plug are bad about going bad. can test boot w/ohm meter. that sounds weird when i read it back but i dont know how to splain any better. kill sw. good choice too. no moisture in your wiring connectors ? all conn. snug w/grease on em? replace spark plug ? they get hot and misfire can b loosened if out on trail and no spare and limp back to camp or ?
 

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Discussion Starter · #6 ·
Im using a whole different coil with the wires and it worked perfect on the other quad. Bran new plug. Checked all the connectors and theyre dry. Its been sitting in a barn for about a week now so they should be dry but they also dont have grease on them.It just doesnt make sense that when it first acted up it would idle but if i tried to rev it it would backfire a lot and just bog down, then it would just die when i tried to rev it. I pulled it back to the shop. It then took forever to start back but ran perfect and now it wont start at all. I've never heard of anything doing something like this. Could it be the main computer possibly? all the electrical still works just wont fire
 

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Since those are not fuel injected, it won't have a computer. All it will have is the CDI and you've already replaced it. It could be your stator or pulse generator.
 

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what is the other box next to the cdi? i thought that was the computer
Probably the alarm unit box that works the oil temp light and electric fan.
 

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Discussion Starter · #10 ·
havent been able to get on lately but i still havent got this thing running. I'm pretty sure its the stator. I started to take the crank case cover off today but i cant get it all the way off because of the driveshaft to the frontend. How can i get the driveshaft off, i looked but cant find anyway it comes off. Also what can be used as a gasket for the crankcase cover once i get ready to put it back on?
 

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havent been able to get on lately but i still havent got this thing running. I'm pretty sure its the stator. I started to take the crank case cover off today but i cant get it all the way off because of the driveshaft to the frontend. How can i get the driveshaft off, i looked but cant find anyway it comes off. Also what can be used as a gasket for the crankcase cover once i get ready to put it back on?
the drive shaft has a keeper c-clip holding it in..it's on the right end of the drive shaft...as your facing it..it sit's inside a metal ring looking thing..you will need a pair of retaining ring pliers to open it off the grove..pull it back towards the front on the drive shaft...once that is done,,take a punch..screw driver..what ever is handy.tap the drive shaft's end towards the front...this will seperate the drive shaft from the output shaft..once that is done..remove the drive shaft..this should alllow you to pull the cover off..this is unless there is another c-clip on the front of the drive shaft ?..if so.repeat the same on it...as far as your bike running..does it still fire one time..then stop ?..if this is the case..then your problem is the c.d.i..i've ran into this problem alot..and yes..you NEED TO HAVE THE SAME YEAR MODEL C.D.I..otherwise you wont get any fire to spark plug !!!..before you pull the side cover off..to get to the stator..i would highly recomend getting the right c.d.i for your year an make..it sure will save you alot of trouble.
 

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I think the 450 has the longitudinally mounted engine. If it does, you will have to unbolt the front diff, move it forward and then the driveshaft will pull out.

It would be best to use a new side cover gasket. If you can get the old gasket off without tearing it, you could probably reuse it and put Hondabond on both sides of it. I recommend getting a new one if you can, though.
 

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Discussion Starter · #13 ·
The last time i checked to see if it was firing it did fire the very first time i cranked it over then quit. I already have the crank case cover a few inches just couldnt get it all the way off cause of the shaft. We got some fourwheeler junkyards around here so il get a dif cdi box. I hate buyin new stock expensive parts lol
 

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The last time i checked to see if it was firing it did fire the very first time i cranked it over then quit. I already have the crank case cover a few inches just couldnt get it all the way off cause of the shaft. We got some fourwheeler junkyards around here so il get a dif cdi box. I hate buyin new stock expensive parts lol
you prob shoulda left your case on...i'm pretty sure it's your c.d.i. i've seen this wayyyyyyy too many times..if you can put the case back on..and you haven't tore your gasket up..i highly recomend that you wait until you get the right c.d.i..one that you know is working from the same year model as yours..your gonna be shocked to see it fire...lol
 
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