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GSX1400: A Magic Carpet with a Rocket up its Arse

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CBG's 1507 (Bought not built)

Started by CBG, Friday, 29 June 2018, 04:29 AM

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CBG

Evening all, it has been too long since I posted on here, so I thought it best to start off a thread about the new toy I picked up late last year but haven't really done much with since then (and with not doing much with it, I haven't really posted much about it on here or FB either).

Disclaimer: 99.9% of this bike was created by one of its previous owners, it was just too good a price to ignore, although I thought it may not be 100% perfect, but that was OK with me and it was too hard to resist at the time.

It's a K2, originally blue and white (I think). It's now a sort of dark red/burgundy colour with a nice red metal flake in it that really pops in the sun, but is a bugger to photograph and show off the metal flake. Here's the shots used in the for sale post that tempted me :)







I might miss a few of the tweaks but the list of cosmetic type mods includes:
Various powdercoated bits
Paint work
Fork sliders and fork brace
Hel oil cooler
GSG engine cases
aftermarket seat cover
braced swingarm
renthal bars
wavy discs (possibly Galfer?)
braided oil cooler lines
PAIRS removed
breather cover
reconditioned calipers all round in black

Then there's the really tempting bits (go faster stuff)
Engine rebuild (not sure why but lots of engine seals/bolts/studs/bearings etc. changed)
1507cc big bore (Wiseco piston kit)
Cylinder head ported and flowed
Kent cams

Will post more in different posts to tell the small story so far

CBG

After picking it up and riding it back down home, on a steady throttle it would surge a fair bit and when you cracked the throttle open hard it would stutter a bit then suddenly pull hard.

First job was to have a look at the fuel filters, not something I've done before on a 14 despite the other silver one I have being quite high mileage.


It was a bit gunged up in there.




but after a full can of carb cleaner through both filters, things were looking a little bit better





on the first flush on the high pressure filter, the cleaner ran back out black, about as dark as used engine oil  :lol:

CBG

next was to do a couple of minor tweaks that were a bit niggly for me, removing the fly screen that was on there


getting rid of the temporary duct tape tank pad (the new one will get swapped again probably, it was just a stop gap thing)




and swapping out the huge aftermarket risers back to a standard set that I had in the garage lying about the place



Del

nice bike fella liking the photos so far keep em coming

Del  :onya:
All Lives Matter
...until you multiply them by the speed of light squared. Then all lives energy.

A 'feuchainn gu cruaidh gus fuck a thoirt seachad - ach gu mì-fhortanach a' fàilligeadh

seth

Very nice bike you have there Paul   :onya:
only a slightly modified gsx1400
oh and a standard one too

Sethbot Postwhore

CBG

After the fuel filter cleaning, it still didn't feel 100% right.......when winding on the throttle it felt like it was holding back, a bit lethargic, especially at lower revs, so I booked it in for a dyno run at RTR in Bingham, ran by bike racer Dan Haggerty who shortly after my visit was tragically killed at the Macau GP :( First time I had met the guy but he came highly recommended and seems like a really sound guy.





He noticed straight away, even on idle that something wasn't quite right, but he stuck it on the dyno to see what the score was. The conclusion was that it wasn't just a mapping problem, and at the time he didn't want to try and tweak the map and just end up masking another issue. The dyno chart is this 14 against one he had previously done with just cans and a PCIII fitted.

Given the work this one has had done, it should be a good chunk more than the 130bhp on the chart


CBG

You can also see on the chart that the fuelling is going a fair bit out at the top end, running rich, and at idle you could really smell the unburnt fuel from the can :)

CBG

No further pics just yet, but on Saturday I was up to see an engine guru I know (up near Scunny) through photographing the top speed events at Elvington and the straightliners events. The plan was to try and get to the bottom of the issue.

We went to the dyno guy he uses, a bloke called Rick Stubbins, who is a pretty good drag racer himself.

After about an hour on the dyno, tweaking the map and trying things, although the fuelling looked absolutely spot on at idle & 5% throttle, you could still smell unburnt fuel at idle and if you blipped the throttle, it would stutter and cough a bit.

Decided to check the plugs (they'd been in for about 400 miles after I changed them in September). Cylinders 1 & 2 were a bit black and sooty, 3 was about average but perhaps a bit cleaner than expected and number 4 was sparkling white, as clean as when it was brand new.

The diagnosis was that it could well be blocked injectors, given the state of the fuel filters....something may have got through and it would naturally get pushed down the fuel rail towards No. 4 before finding its way into the injectors.

At home I Swapped two from my ancient black 14 that has been sitting for about 10 years untouched and it was immediately smoother and more happy to have the throttle blipped from tickover.

Final update is that I sent both sets of injectors off for cleaning, and they are due back tomorrow. According to the guy doing it, the ones marked up from cylinders 3 & 4 were flowing just about right, but the spray pattern was all over the shop and it would have caused issues atomising the fuel correctly.

Fingers crossed that's the cause of the running issues, and that it releases more ponies from the stable eventually too :D

Blubber

Let's hope so...

keep the info and pics coming... You have been holding back from us  ;)
Wreck-it Richard - one of the unDutchables

CBG

pmsl, I have been holding back, mainly because I was being so fucking slow getting my arse into gear and getting it looked at lol.

I'm away all weekend, but the plan is to drop the clean injectors in, go for a ride and see how it is, then arrange to get it booked in again for a full remap. It looks like the original map was done to try and work around the issue as the guy on Saturday said there were some very strange numbers in the table lol

Blubber

Sounds like a plan  :onya:


And... I know tinkering takes its time. Cant rush quality is my excuse  :popcorn:
Wreck-it Richard - one of the unDutchables

northern

@CBG
nice bike, which (it sems) was loved by previous owners.  :onya:

Hope you figure and solve those issues!

CBG

Quote from: Del on Friday, 29 June  2018, 04:44 AM
nice bike fella liking the photos so far keep em coming

Del  :onya:

Cheers Del, I'll get some extra pics and dyno vid soon with any luck

CBG

Quote from: seth on Friday, 29 June  2018, 04:48 AM
Very nice bike you have there Paul   :onya:
Cheers Seth. Looking forward to releasing it's full potential.
Planning some other tweak ideas atm too ;)

CBG

@northern
It has definitely had some money spent on it in the past. It is looking promising with the injectors

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