Joined May 2006
3 Posts | 0+
Eagle, Idaho
02` FC470E Engine total breakdown F¤/%&¤"#¤#%
- Thread starter Theduckllr
- Start date
Re: 02` FC470E Engine total breakdown F¤/%&¤"#¤
Maybe Cam Chain broke and smashed top casing etc.
Maybe Cam Chain broke and smashed top casing etc.
Joined Nov 2001
17K Posts | 774+
Ely, England
Re: 02` FC470E Engine total breakdown F¤/%&¤"#¤
i've had it happen as well. i think it was 25 months ago. you may find a tappet nut missing or the chain snapped etc.
get yourself a used rocker cover, a new camwheel, and you'll need the uprated camchain, uprated tensioner blade, and to modify your existing tensioner.
there may be more. see if you can get every single piece of swarf out and then you may not need to rebuild.
oh and welcome to UHE! please go into 'the doc' which is on your left and look at the 'red alert' section.
regards
Taffy
i've had it happen as well. i think it was 25 months ago. you may find a tappet nut missing or the chain snapped etc.
get yourself a used rocker cover, a new camwheel, and you'll need the uprated camchain, uprated tensioner blade, and to modify your existing tensioner.
there may be more. see if you can get every single piece of swarf out and then you may not need to rebuild.
oh and welcome to UHE! please go into 'the doc' which is on your left and look at the 'red alert' section.
regards
Taffy
Re: 02` FC470E Engine total breakdown F¤/%&¤"#¤
my 650 did this
the bolt in the cam sprocket which is a stop for the decompressor sheared and got into chain and went up and out
the newer sprockets have a stop pressed in so i got one of those
my 650 did this
the bolt in the cam sprocket which is a stop for the decompressor sheared and got into chain and went up and out
the newer sprockets have a stop pressed in so i got one of those
Joined May 2006
3 Posts | 0+
Eagle, Idaho
Re: 02` FC470E Engine total breakdown F¤/%&¤"#¤
Well, it appears the the voices of experience were indeed correct. The guide failed, disintigrated, then cahin then failed, bunched up and blew through the cover. Should all be fixed in about a week. Not inexpensive, but could have been much worse! Action photos to come shortly.
Well, it appears the the voices of experience were indeed correct. The guide failed, disintigrated, then cahin then failed, bunched up and blew through the cover. Should all be fixed in about a week. Not inexpensive, but could have been much worse! Action photos to come shortly.
Re: 02` FC470E Engine total breakdown F¤/%&¤"#¤
As Dez said, at least check compression leakage to make sure the piston hasn't kissed the valves.
A previous 2nd hand bike had slightly bent exhaust valves when I got it. They had carbon'd up and seemed to be sealing OK. It ran fine, but they must have leaked when they first got bent.
I did at least 3000km on it before pulling it down to fix a head gasket problem & finding them. I guess I was really lucky one did not fall apart while it was running.
As Dez said, at least check compression leakage to make sure the piston hasn't kissed the valves.
A previous 2nd hand bike had slightly bent exhaust valves when I got it. They had carbon'd up and seemed to be sealing OK. It ran fine, but they must have leaked when they first got bent.
I did at least 3000km on it before pulling it down to fix a head gasket problem & finding them. I guess I was really lucky one did not fall apart while it was running.
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