Starting help

snydes · Post by **snydes** » Sun Oct 11, 2015 1:12 pm

I did a valve job on my fzr400 1989 1wg and when I went to try and start it, it back fired like crazy and carbs were like shooting out smoke. I have the air filters, exhaust and gas all connected. It sounds like it is going to start but never fully goes. I have a good spark and the spark gaps are correct. Oil is in the bike as well. Not sure what the issue could be. Only thing that isnt connected is my rad which it shouldn't need to be. I lastly had good compression last time I checked it.

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snydes · Post by **snydes** » Sun Oct 11, 2015 1:33 pm

snydes wrote:I did a valve job on my fzr400 1989 1wg and when I went to try and start it, it back fired like crazy and carbs were like shooting out smoke. I have the air filters, exhaust and gas all connected. It sounds like it is going to start but never fully goes. I have a good spark and the spark gaps are correct. Oil is in the bike as well. Not sure what the issue could be. Only thing that isnt connected is my rad which it shouldn't need to be. I lastly had good compression last time I checked it.

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Also does anyone know any fuel petcock replacements? Mine is leaking right now and don't know of any rebuild kits

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Post by **DonTZ125** » Sun Oct 11, 2015 4:39 pm

4X8-24534-00-00; Seal, Cock (internal o-ring)
4X8-24512-00-00; O-ring (external seal)

Sounds like you've got your cams mis-timed (or swapped).

snydes · Post by **snydes** » Sun Oct 11, 2015 4:41 pm

DonTZ125 wrote:4X8-24534-00-00; Seal, Cock (internal o-ring)
4X8-24512-00-00; O-ring (external seal)

Sounds like you've got your cams mis-timed (or swapped).

My cams aren't swapped and they are timed correct because when I was doing the valve job, when the chain was off by 1 tooth the motor would stop turning (by hand) and once in correct position it would spin.

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snydes · Post by **snydes** » Sun Oct 11, 2015 6:26 pm

And for the petcock, the seals when i ripped it apart it looked fine but who knows.

evan_calgary · Post by **evan_calgary** » Sun Oct 11, 2015 10:12 pm

Sounds like your timing is out. possibly by 180 degrees? Think about it...intake valves are open when the bike is firing or evacuating exhaust out the intakes...

Also o-rings should be inspected with a magnifying glass and can also just be too compressed to seal.

snydes · Post by **snydes** » Sun Oct 11, 2015 10:46 pm

But when I was doing the timing with the valves, there are marks on the cams and your supposed to align those upright and put the engine at TDC. which I did any everything seemed fine as I got around 140psi (with some extra oil put in cylinders) when I ran a compression test. When i ripped the spark plugs out they were a tad bit damp but no real signs of flooding. Fuel pump seems to be working fine but I plan on doing a full carb clean and possible sync shortly if there are no other ideas.

evan_calgary · Post by **evan_calgary** » Sun Oct 11, 2015 11:57 pm

Just saying I have had a similar issue before and that was the problem. It was NOT with an FZR so I think we need someone with more experience with these motors to chime in.

snydes · Post by **snydes** » Mon Oct 12, 2015 7:24 am

evan_calgary wrote:Just saying I have had a similar issue before and that was the problem. It was NOT with an FZR so I think we need someone with more experience with these motors to chime in.

Okay well thanks for the other advice.

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snydes · Post by **snydes** » Sat Oct 17, 2015 4:25 pm

snydes wrote:
evan_calgary wrote:Just saying I have had a similar issue before and that was the problem. It was NOT with an FZR so I think we need someone with more experience with these motors to chime in.
Okay well thanks for the other advice.

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UPDATE
The bike just won't fire up. It turns over and backfires (intake and exhaust) even after a carb clean. I have a feeling my fuel pump isn't working totally correct. It is even more surprising the bike won't start with Quickstart. I retested compression and it was all good across the board. It also seems as the choke does not help the bike to start at all. I have a feeling something is wrong with it. Any suggestions?

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TomcatMJ · Post by **TomcatMJ** » Sat Oct 17, 2015 4:48 pm

Check the camshafts and the valves for possible defects...last time i had a fat backfire from the carbs had an expensive reason, and the last sound while trying to startup the motor after the first backfire wasn't really a backfire but a bit fat bang with follow up of a lot of smoke (including a partially burned airfilter)...and the intake-camshaft was broken :-/...just some days before i had done a valve-clearance and thought i followed the remounting of all parts as shown in the service manual, but seems i hat pulled one or two screws with an obviously bit too high torque (thought 10 Nm but wasn't sure so checked twice and seems i stepped over the 10 Nm at this second check) so the camshaft stuck while the motor wanted to startup...it just broke in 2 parts and on eof the valves seemed to have hitted a piston (so the whole motor stucked) ...i was lucky to get a spare-motor for less costs than a set of gaskets and so changed the motor instead of repairing all defects inside,getting a new camshaft etc. ....ok, so i have now a spare transmission for the other (my bikes original), just a bit longer times defective 3bf motor in my cellar

snydes · Post by **snydes** » Sat Oct 17, 2015 4:56 pm

TomcatMJ wrote:Check the camshafts and the valves for possible defects...last time i had a fat backfire from the carbs had an expensive reason, and the last sound while trying to startup the motor after the first backfire wasn't really a backfire but a bit fat bang with follow up of a lot of smoke (including a partially burned airfilter)...and the intake-camshaft was broken :-/...just some days before i had done a valve-clearance and thought i followed the remounting of all parts as shown in the service manual, but seems i hat pulled one or two screws with an obviously bit too high torque (thought 10 Nm but wasn't sure so checked twice and seems i stepped over the 10 Nm at this second check) so the camshaft stuck while the motor wanted to startup...it just broke in 2 parts and on eof the valves seemed to have hitted a piston (so the whole motor stucked) ...i was lucky to get a spare-motor for less costs than a set of gaskets and so changed the motor instead of repairing all defects inside,getting a new camshaft etc. ....ok, so i have now a spare transmission for the other (my bikes original), just a bit longer times defective 3bf motor in my cellar

Well my motor isn't stuck, I know that the timing and everything is perfect. I have a video I'll post later of it trying to start up and you can hear how close it is.

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snydes · Post by **snydes** » Sun Oct 18, 2015 11:31 am

Here is the video to the attempted start. https://www.youtube.com/watch?v=YfarQBZVI6Q

I have since learned I had spark plug wire 3 &4 backwards but it still did not change anything

TomcatMJ · Post by **TomcatMJ** » Mon Oct 19, 2015 3:08 pm

Can't view this as i don't have a youtubeaccount and the video underlies privacy-restrictions :-/

snydes · Post by **snydes** » Mon Oct 19, 2015 3:09 pm

TomcatMJ wrote:Can't view this as i don't have a youtubeaccount and the video underlies privacy-restrictions :-/

I'll make it public in a few

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