1993 CBR900rr Cranking No Start - Honda Motorcycles - FireBlades.org
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post #1 of 15 Old 05-14-2019, 2:33 AM Thread Starter
 
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1993 CBR900rr Cranking No Start

Hello I'm not sure if is the right place to be posting this or not, but hopefully you guys can still help. I bought this 93 cbr900rr a few days ago without a tank or seat. Tried starting with starting fluid but got nothing. I have power to both coils but only one is getting the pulsing ground from the cdi. im assuming that since its firing one of the coils that its got to be a bad cdi or wire from there to the non functioning coil. but im not a motorcycle mechanic.. thats why im here. I haven't had a chance to check continuity from the coil to the ignition control unit but will in the next few days. Can someone point me in the right direction if im off track?? i found a 96-98 service manual, is that usable for this 1993? also found a universal electric fuel pump lying underneath the bike. Did these bikes come with an electric pump? Appreciate any help
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post #2 of 15 Old 05-14-2019, 3:40 AM
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Re: 1993 CBR900rr Cranking No Start

Hello and welcome to the forum Jamie, yes would suspect the coil or the wire leading to it, slight differences between the two, Throttle Position Sensor being one, search the net for the proper one , but here's some fair usage info,
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CBR900 93-94.JPG‎   CBR900 95-98.JPG‎  

Last edited by MrPickwick; 05-14-2019 at 4:12 AM.
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post #3 of 15 Old 05-14-2019, 3:17 PM
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Re: 1993 CBR900rr Cranking No Start

Quote:
Originally Posted by jamieclark22191 View Post
Hello I'm not sure if is the right place to be posting this or not, but hopefully you guys can still help. I bought this 93 cbr900rr a few days ago without a tank or seat. Tried starting with starting fluid but got nothing. I have power to both coils but only one is getting the pulsing ground from the cdi. im assuming that since its firing one of the coils that its got to be a bad cdi or wire from there to the non functioning coil. but im not a motorcycle mechanic.. thats why im here. I haven't had a chance to check continuity from the coil to the ignition control unit but will in the next few days. Can someone point me in the right direction if im off track?? i found a 96-98 service manual, is that usable for this 1993? also found a universal electric fuel pump lying underneath the bike. Did these bikes come with an electric pump? Appreciate any help
When you tested spark for each cylinder by grounding the spark plug and firing the start button which ones fired and which ones didn't? These ignition systems are modern, but very simple in design. It's tough to tell be testing continuity and resistance in components, versus real word test as testing spark at each spark plug. Coils can be had on eBay regularly. But, I'll say that older CDI's ICM's or ECU (depending on what you want to call it) failures are VERY rare. Do you have any pics of what you're dealing with? I would love to see them. I was able to (fairly easily BTW) add coil on cap (coil sticks) on my 99 track 900 with eBay parts for under $100. I felt it would eliminate any future "old coil" failures.

And yes, the 93 originally had an OEM fuel pump, but it was a non pressure producing pump, it only helped the fuel along, pulsating in cadence with the ignition, so it only works when the engine is running.



Quote:
Originally Posted by MrPickwick View Post
Hello and welcome to the forum Jamie, yes would suspect the coil or the wire leading to it, slight differences between the two, Throttle Position Sensor being one, search the net for the proper one , but here's some fair usage info,
Right on Bill, the ignition systems save for the rogue pink wire and TPS, is the same and should test with near identical procedures and similar results.

Note there are also STICKY wire diagrams for all 900 models here:

https://www.fireblades.org/forums/ho...-diagrams.html


Keep us up to date on this, I love to verify and report current information about older coil failures and/or CDI failures. I still have yet to see them become common failures even 26 years later.
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Last edited by IanDoohan; 05-14-2019 at 3:21 PM. Reason: added pump info
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post #4 of 15 Old 05-14-2019, 5:18 PM Thread Starter
 
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Re: 1993 CBR900rr Cranking No Start

Thank you for the diagram i didn't have that one

CBR900rr was bought for a go cart engine.. but now i just dont know
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Re: 1993 CBR900rr Cranking No Start

Thank you for the response. I had spark at cylinder #2 and #3 . i checked continuity and found a break in the yellow with blue wire. I ran a new wire and now have spark at all 4 wires. tried starting with starting fluid still get nothing not even a pop. I still havent pulled the plugs yet i was just checking at the plug wire, so ill do that next and report back.
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CBR900rr was bought for a go cart engine.. but now i just dont know
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post #6 of 15 Old 05-15-2019, 5:34 PM
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Re: 1993 CBR900rr Cranking No Start

Have you tried rigging up a proper auxiliary fuel tank rather than just starting fluid.


1993 CBR900 RR P
2013 Triumph 675 Street Triple
1994 CBR900 RR R Urban Tiger Project (now sold)
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post #7 of 15 Old 05-21-2019, 2:23 AM Thread Starter
 
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Re: 1993 CBR900rr Cranking No Start

I put a gas can on the handle bars and and started a siphon with a 3/8ths fuel line. Seemed like i had more than enough pressure maybe to much. She pops and acts like she wants to start. I've never worked on motorcycles before I'm used to cars with efi and pressurized fuel systems. So any ideas are greatly appreciated. I'll figure it out eventually, spark is pretty weak (barely jumps an 1/8th inch gap) but maybe thats how these bikes are? ill eventually check compression and verify timing. i really thought id have this running by now. challenges are fun though. I ordered a tank so ill try that soon.
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CBR900rr was bought for a go cart engine.. but now i just dont know
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post #8 of 15 Old 05-21-2019, 3:20 PM
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Re: 1993 CBR900rr Cranking No Start

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Originally Posted by jamieclark22191 View Post
I put a gas can on the handle bars and and started a siphon with a 3/8ths fuel line. Seemed like i had more than enough pressure maybe to much. She pops and acts like she wants to start. I've never worked on motorcycles before I'm used to cars with efi and pressurized fuel systems. So any ideas are greatly appreciated. I'll figure it out eventually, spark is pretty weak (barely jumps an 1/8th inch gap) but maybe thats how these bikes are? ill eventually check compression and verify timing. i really thought id have this running by now. challenges are fun though. I ordered a tank so ill try that soon.
Gravity is enough to get these old girls running.

An 1/8" gap is like trying to jump the Grand Canyon, the plugs should be gapped at about .031"-.035". In comparison, 1/8", (or .125") is tremendous.

My 99 900RR Track Build Link:Track Build 900RRX

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post #9 of 15 Old 06-15-2019, 4:55 AM Thread Starter
 
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Re: 1993 CBR900rr Cranking No Start

so i have a tank hooked straight up to the carbs, should that be good enough for it to start? i hooked the fuel line to the pump but didn't get any flow while cranking, like it was completely blocked off? bad pump? I had a fully charged car battery and jumper cables hooked up to the terminals on the bike before (it didn't come with a battery). But anyways I put a new battery in it and the spark is way stronger (duh lol) but still doesnt fire with the tank hooked up the carbs and hot spark.. I'm assuming that this is a waste spark system and i cant mix up the wires for cylinder 1&4 or #2 &3 and have them backwards??? like the coil for cylinder 1&4 can those wires be mixed up? I got the bike out of the back of my truck and into my garage, so I'll get her going soon I just got back to working on it today. I ordered a new fuel pump just because it was inexpensive (not trying to just throw parts at it... I'm very good at diagnosis on cars just not familiar with bikes) Appreciate the help Ian... And i get that 1/8 inch is a big gap for a plug but for checking the strength of a coil it doesnt seem like much, but idk bikes really at all besides dirtbikes growing up. Thanks any ideas of stuff to try would be appreciated

CBR900rr was bought for a go cart engine.. but now i just dont know
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Re: 1993 CBR900rr Cranking No Start

Poured a splash of gas in each carb this morning and she fired up for the first time But wouldnt stay running and wouldnt start with just the tank i have hooked up. so definetly a fuel problem now. Also the fuel pump is spitting fluid out all of a sudden which sucks cuz i just bought one, theyre super cheap so its all good. I guess ill hook the tank back up to the pump and see if she'll fire by herself.

So the main issue was just the broken yellow wire with a blue stripe between the coil and cdi, and not having a proper battery in it. Now i just have to put the fuel system back together (didnt come with one).. you can tell someone spent a very long time trying to get this bike running, very excited to bring her back.

Im sure the carbs need to be cleaned for it to run right, but it should start without a cleaning right???

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Re: 1993 CBR900rr Cranking No Start

Keep us up to date on this, I love to verify and report current information about older coil failures and/or CDI failures. I still have yet to see them become common failures even 26 years later.[/QUOTE]

It was a broken wire between the coil and cdi the yellow wire with a blue stripe havent found the break but i ran a new wire and I've got hot spark on all cylinders now
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Re: 1993 CBR900rr Cranking No Start

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Originally Posted by jamieclark22191 View Post
Keep us up to date on this, I love to verify and report current information about older coil failures and/or CDI failures. I still have yet to see them become common failures even 26 years later.
It was a broken wire between the coil and cdi the yellow wire with a blue stripe havent found the break but i ran a new wire and I've got hot spark on all cylinders now[/QUOTE]

It’s always something really simple, it’s finding it which is the challenge!


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Re: 1993 CBR900rr Cranking No Start

FUEL TANK IS HOOKED UP TO THE FACTORY FUEL SYSTEM, PUMP IS WORKING. I DISCONNECTED THE LINE AT THE TEE RIGHT BEFORE THE CARBS AND HAVE PLENTY OF FUEL THERE. I CAN SQUIRT A LITTLE GAS INTO THE CARBS AND ITLL START EVERYTIME BUT ONLY RUNS FOR ABOUT 1 SECOND. IM FIGURING THAT IM GOING TO HAVE TO REBUILD THE CARBS, BUT I CANT THINK OF WHAT WOULD CAUSE ALL OF THE CARBS TO NOT TAKE IN ANY FUEL. ANY IDEAS???

CBR900rr was bought for a go cart engine.. but now i just dont know
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post #14 of 15 Old 06-17-2019, 9:28 AM
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Re: 1993 CBR900rr Cranking No Start

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Originally Posted by jamieclark22191 View Post
FUEL TANK IS HOOKED UP TO THE FACTORY FUEL SYSTEM, PUMP IS WORKING. I DISCONNECTED THE LINE AT THE TEE RIGHT BEFORE THE CARBS AND HAVE PLENTY OF FUEL THERE. I CAN SQUIRT A LITTLE GAS INTO THE CARBS AND ITLL START EVERYTIME BUT ONLY RUNS FOR ABOUT 1 SECOND. IM FIGURING THAT IM GOING TO HAVE TO REBUILD THE CARBS, BUT I CANT THINK OF WHAT WOULD CAUSE ALL OF THE CARBS TO NOT TAKE IN ANY FUEL. ANY IDEAS???
Do the carbs need a reason to be cleaned? Was the bike sitting for more than a few months loaded with fuel? If it was longer than that then yes, they’ll need to come apart and be cleaned. Even if you verify that the float bowls are full by cracking a float bowl drain doesn’t mean there is fuel atomizing in the I tKe tract. It’s a Venturi system, so fuel is pulled through the jet orifices via a vacuum like affect. The passages are so small that any form of blockage will not let fuel pass.

I use gravity feed on my 93. It was a weight savings trick years ago to delete the pump all together. So gravity from the tank is sufficient to allow the bike to run.

Ya I the carbs off and give them a thorough cleaning, that’s probably what it is unless you have no compression. Upwards of 175psi in each cylinder is good.


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Re: 1993 CBR900rr Cranking No Start

I really appreciate the help brotha. I lost my compression tester and im not sure if it would have had the right adapter anyways, is there one that you would recommend? I have no idea on any history of the bike, I'd guess its been sitting in the warehouse where i found it for many many years. I'm not to familiar with this type of carb but ive rebuilt plenty of edelbrock and holley four barrels so ill figure it out, should be pretty simialar cleaning and replacing diaphrams and such. Any tips on cleaning/rebuilding the carbs or writeup or video you could link me too? thanks again man
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