GT650r repair manual
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Hello. I was hoping to get some clarification here.. I have a 2007 GT650r, (USA model, i assume since i’m in the USA), and searched online for the repair manual. I downloaded what I found, but being old (school) I actually LIKE having a paper manual most times.. So, i found one for sale, for the comet 650, p/n 99000-94810. Thinking the engines would be the same, just the style and bodywork, etc, would differ. The manual i got is essentially the same as what i’ve found online, but things such as the jetting of the carbs is off. For instance, the main jets on my digital copy state a 125 front, and 122.5 rear, main jets.. This book lists both as 130. Not too much of a difference, but i’m just wondering if anyone knows the correct manual for this model, or if this IS the right one, just covered by the disclaimer in the book that specs may have changed and not been incorporated. Also, i bought this on ebay from someone in England, so it MAY be the EU specs? Just thinking out loud here.
Bike I have had the muffler MODIFIED and gutted, so i’m doing some things and just wanted to know the starting point from the factory, and now i’m wondering why the difference. Also to note, my assumption is based on the manuals for the comet 250 (GT250r). I bought the manual, and it just covers the base (naked) gt250 and GT125, and there is a supplemental manual for the GT250r version, which covers (mostly) just the body work.
Anyway, Just thought i’d ask and see if anyone might know the ‘correct’ manual part number for the carby model.
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Hey,
The jetting sizes for “Mains” are OK with a variation of 5 or 2.5 it is because some states in your country or even EU countries have certain emission regulations , so if the bike arrives “downjetted” with- charcoal cannisters
- EGR (they errornously call it) (actually is called AIS or 2nd Air Valve System)
It would then make sense as to why Korea also has variations of their manuals but….”beside jetting” , 90% of the book tends to be globally correct for all their models as no other country has a “special carb” than the other country etc. The workshop manuals used to be for dealers in the old times when servicing or trying to honor warranties etc, we consumers just got the “cut down” version call owners manual which covers small owner maintenance leaving the big stuff to garages & dealers 😉 but i digress i assume you know this already
GT Naked models (250cc and 650cc) all use the same parts as the R model of the same year except ,
- R’s tend to be twin discs + nose metal cage added for face fairing
- Frame has a “2 stubs” to mount the cage (click here)
- Their own Box Headlight that is dual lamp (h1 & h3)
- A digital dashboard for 250R carbies only (Since carby GT250 has a twin old school dials)
A GT650 naked will have digital dash but usually towards the end of its carby era , transitioning to EFi (circa 2008-2010)
GT650R carby since 2005 has had a digital dash
Now if a bike has an “older twin clock” style dash , it will have a harness tied specifically to that. As some Naked models won’t accept a digital dash etc without its R harness variant (or EFi harness for EFi clocks) etc
All EFi models of GT naked use the same dash as their R sisters.
As i have learned over the years , the sections of manual covering the “facial” plastics or extra body work isn’t covered in great depth anyway, as fairings for R models are straight forward;-) , i am not sure what they would need to cover? Typically if a fairing breaks , Hyosung would say replace (or we over here in UK , send it to the bodyshop guy for repairs and repaint 😉 )
I think you will be OK with the current paper manual you have but if in doubt about a specific section , you’re welcome to ask!
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Thank you for the reply, Marcel.
Unfortunately, I didn’t fully state that i’m (somewhat) familiar with these bikes, and of course bikes in general. What i was actually looking for was the repair manual part number, so i could research the stock jet size. As stated, the electronic manual i have lists a 125 front, and 122.5 rear (as the rear is smaller due to the heat from the front cylinders, at least that’s the theory i found), but the paper manual lists a 130 for both. That’s a size difference of 5 in the front, and a 7.5 in the rear. As per your post, that’s above the OK variation
And, since i have a modified airbox, i’m thinking it will be larger than stock. BUT, the PAPER manual starts out bigger. Now, as you know, it’s better to go rich than lean, but I was hoping to find the starting point, at the very least.
Again, thanks for the reply. I appreciate it.
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Strange but here in UK the rear is hotter due to fact it gets less air (ironically not an air cooled bike but benefits from jet enrichment on the rear). Every twin hyosung i have worked on always had a rear cylinder 2.5 steps above the front.
Your setup with the customizations will be okay with a 127.5 range to 132.5 max size main jet on each cylinder. And this can be verified by plug chops that you will do just to make sure mixture is good.
The oem sizes is correct for 125 and 122.5 but rear should have had the bigger jet.
Did this help ? 🙏
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