Fuel Injector Interchange - Suzuki Volusia Forums : Intruder Volusia and Boulevard Forum
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post #1 of 23 (permalink) Old 02-10-2019, 01:23 PM Thread Starter
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Fuel Injector Interchange

Does anyone know of an other injector for the M50/C50? The Suzuki Branded ones are $170/200 Yet on Ebay you can find injectors for the C90/LC1500 for under $20 . There must be an Alternative, Yes?


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post #2 of 23 (permalink) Old 02-10-2019, 01:50 PM
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Nope. The C90 injectors will NOT work on the C50.

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post #3 of 23 (permalink) Old 02-11-2019, 09:20 AM Thread Starter
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Thanks ,I figured as much. Guess I'll have to pony up!
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post #4 of 23 (permalink) Old 02-16-2019, 10:46 AM Thread Starter
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So, I got the two new injectors,should be here today. We will see if it solves the stumbling/ idle stalling! I'll report back! $350.00
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post #5 of 23 (permalink) Old 03-11-2019, 10:09 AM
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I've been looking into this issue as well. The Burgmans and GSXR's are the same part #, and can be had quite cheaply both used and even as new aftermarket for reasonable prices. the "G10" injectors are used on the C90 and several other models, but the "G14" injectors that the C50 uses seem to be an exclusive to this engine.

I was looking for specs on the injectors- namely cc/min flow rate since that's the key as physically they're all identical from what I've seen, but haven't had much luck turning up numbers. There's a youtube video of someone cleaning C50 injectors and the "clean" test flowed about 62cc of fuel in 30 seconds at what they said was 50% duty cycle, which would seem to suggest they're 250cc/min injectors, a relatively common size for both car and MC use.

$200 for one fuel injector is absolute insanity even by OEM standards.
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post #6 of 23 (permalink) Old 03-12-2019, 02:16 AM
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Here's what I found. The stock C50 (I have an 05 model, so this info is only relevant for 05-08 C50 or M50 bikes) injectors are made by Keihin (you can see their "K" logo stamped on them) and are their code C. On Keihin injectors, the single letter code refers to flow rate. The other codes underneath the electrical connector refer to batch/date of production and ultimately meaningless.

Punch "Keihin C injector" into google and a-ha, it turns up a plethora of fitment for Civics throughout most of the '00s. Honda part # 16450-PLC-003, but also commonly referred to simply as a Keihin "C stamp" or "type C". Physically they appear identical. They are also 4 hole injectors. That Honda part has a plethora of cross references as well.

Bostech MP4169
SMP FJ338
BWD 63774
Autoline 16323
GB Reman 842-12282
Wells M799
Airtex 4G1302

Ebay is littered with those (or rockauto, or virtually anywhere). Prices are generally around $20-25 apiece for either new aftermarket or remanufactured Keihin's. Far cry better than $220 for one from Suzuki.

But, what about actual flow rate- just because they look the same doesn't mean they are. This was tricky, as far as I can tell there are no readily available or published specs for these in OEM fitments. All data is from independent testing by performance shops or injector remanufacturers that have cleaning/flow test rigs.

Shows a test of stock C50 injectors. The post-cleaning result shows approximately ~57cc's of flow after a 30 second test at 50% duty cycle. That equates to about ~224cc/min flow rate (standard measurement).

Looking up stock injector size for a Honda D17A6 engine, tests all point they are anywhere between 220 and 230cc/min, again, depending on who did the test. Some variance is to be expected, but the agreement is right in that range. 3 bar (44psi) also seems to be largely standard for port fuel injecton systems, so this should be apples to apples.
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post #7 of 23 (permalink) Old 03-12-2019, 05:54 AM
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Run a can of seafoam once a year and the injectors should last the life of the bike
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post #8 of 23 (permalink) Old 03-12-2019, 11:26 AM Thread Starter
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True UNLESS..... They malfunction electrically rather than clog which is what mine did . But appreciate the advice anyhow THANKS!!!!
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post #9 of 23 (permalink) Old 03-12-2019, 12:16 PM Thread Starter
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Rwhitehosue. Thanks for the info. Unfortunately I already got them from the dealer.
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post #10 of 23 (permalink) Old 03-13-2019, 01:29 AM
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Or, you bought a secondhand bike that has been sitting with a rusty tank. Dumping a can of magic potion in the gas does not take care of that, nor did a DIY ultrasonic clean, or even a professional injector service. If a bike with a rusty tank was jerry-rigged to run again after storage, the injectors can be ultimately just f-ed. No amount of potions, cleanings, will restore them to proper function and you'll chase your tail with a poorly running bike.

The main culprit in my case was the filter on the in tank pump assembly. It's the little cylindrical thing in between the pump and flange. This was absolutely packed full of a rusty, nasty sludge. I could stick a pick in there and scrape it out, that bad. Being Suzuki does not sell this part(unless you want to buy the entire pump assembly for $500), I had to clean it. This wasn't easy but doable. Let it soak in vinegar overnight and literally chunks of puke dumped out of it in the morning. Carb cleaner followed with shop air blew out more muddy crud. Sent it for a few baths in the ultrasonic cleaner with 50/50 simple green and water and liquid turned to sludge again within a few minutes. Eventually it started coming out clean. Gave it another few blasts with carb spray, which came out clear, and reinstalled.

I'm guessing failure to thoroughly clean the in tank pressurized filter was the reason behind the "1-2 tanks" of good performance between clearing the injectors. The cruddy filter was plugging them up again.
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