♠️ M77
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Well explained , now i fully get the picture, so if you want a tequila shot answers , ill shoot em below:
- Fuel Pump wanning (happens, carb cleaner sorts it when you take it apart CAREFULLY) or as pre-caution, replace with a new one if you want us to get it.
- Fuel Filter Clogging or not flowing fast enough (if its OEM)
- Fuel Float Level low (repeated in service manual too) (check floats are on a good height, as fuel goes low, then the jets won’t reach , due to pump & tap not replacing the fuel fast enough = high revs . high speed , more demand)
- Carb Slides wanning.
- Carb Slide needle may be on the lean setting (sent 1x needle for free, just incase one of yours is bent too)
- TANK TAP , wanning = Common.
Since its naked, after a ride , check carefully that both cylinder heads are hot or get an oven thermometer against each head, mark their temps, then check plug colours.
Plug checks will be a very good way to tell me how your “spark” “air” and “fuel” system is doing , not a full picture but enough hints to show me.
Side view of the plug threads (heat check)
Top down view of plugs (to see the white cones inthe middle)I could advise further after your next comments.
Normally , when a hyosung that is all OEM and negelected (either by garage or last keeper) , the carby 125 ones at least , they usually spend their lives in the city with a max of 40mph runs , then owners use crap service parts on them to keep em going, but never touch the carbs , or do engine clearances (valve clearances do eventually get too tight , being a hot engine doesnt help) , never changing air filter….
Fast forward , the next owner buys it 100 miles away from his house.
He decides to pay the neglectful seller, goes on A1 even to ride home 100 miles, 40 miles are okay but last 60miles involve dual carriage ways of 70mph , he breaks down as soon as he goes from 40mph to 70mph and races it for 2 mins straight, the bike stops sparking , but all the owner can do is coast it to the side of road , electrics are still on!
What happened?
Negelected Fuel System!!! (& some times heat damage to coils, stator & the reg rec = also common)
He starts the bike again after letting it sit for 6mins ….
How?
The cranking & cranking was sending fuel back to the carbs so that the floats can raise and the jets can finally reach the fuel level needed to start.
Now he must ride 40mph max so that the “wanning” fuel system (all of it) can still keep “trickling” down more fuel to maitain fuel level to get him home
Or
His electrics are kinda calm under 5-7k revs …..but the bike rides better at 8-10k revs (catch 22 for him!) UNLESS he is in fifth gear above 60mph, then lower revs is fine but his fuel system already forced him off road if he goes beyond 40mph on dual carriage ways.
He is now forced to ride away from big roads until then.
Seen it. Witnessed it myself.
Hmm, can i just ask , how many tries did it take to start it back up again?
Also if you managed to get home that’s good, but on the 2nd ride, if you tried to exceed 60mph, what does the rev counter do ? does the engine still feel smooth or just it start jerking forth and back ?
hey you are very welcome, please excuse my “crazy/psycho” packing skills, i just had to be OCD to make sure international packages don’t get transit damage whatsoever 🙂
I hope the weather is calmer up there, here in UK we are in spring also . so go have a ride!
Welcome 🙂
Hope the bike life return means you don’t sign off again 😉 Hope you’re doing well with the hyosung, keep an eye on the 250 or 650 versions when you pass Mod tests , and stick around 😉 Hell if you end up with an SV650, it’s okay, they shared the same bed with Hyosung Korea at one point hence their engines have similarities (not the same iniside though!) , hell our GT125s robbed the suzuki GS frames for it.
OEM is 15T , so having 14T , might take 10-15mph off the top speed , but bike will rev much higher as it gets through gears quicker.
I am guessing the accelaration needs mean the engine will have a better coolant (you want the piston heads to stay cool and radiator fans not on all the time) and good grade oil to keep that gearbox happy to go through gears faster ?
But do keep an eye on the engine temp bars from sprocket changes.
It really depends how far you go aswell, if you travel places more than 50miles away , you want the revs to be lower in cruising mode 🙂
Change the slides and do the “slide mod” tutorial on this forum to help with the higher rev range, try using LASER plugs too (if not already but get a 2nd set just incase) , usually a good carb tune goes through a few plugs first 😉 , you got this.
Congrats on the MOT too! Happy days to have another hyo stay on the road. It upsets me when they got sorned off and rot in gardens
Ok thanks I did that, I took it out for a short ride afterwards and when I parked there was light smoke coming off the engine from the heat. I think it could be running lean since I got higher end air filter or could possibly be smthn else?
i would also look to change the jets as “more air” = lean mixture , engine overheats , could burn oil as piston rings can only tolerate so much. There is a jet tutorial on forum if you have seen it ?
As for crank smoke , go with Simon’s comments
Front = Rich , or ignition coil or ignition cap is wanning.
Rear = Rear cylinder jet may be blocked in full throttle , or slide NEEDLE is on lean setting or , plug is wanningClean the spiral threads of the plugs , or get new ones CR8E stock, then go for a little short test , take them out.
= If the plug threads are wet with oil, there could be an internal head leak to do with gaskets or valve seals
= If the plug threads are dry BUT ….all threads are dark = bike is overheating a tiny bitThe threads should be totally dry leaving on about 3-4 lines of thread dark , this would be acceptable and normal.
Hope this helps, will check your email shortly as i did get it but i was away for a day , my apologies!
Yes he’s right
but sorry to say you are not unique as I’ve owned my for 8yrs and still enjoy the attention it gets Regards8 years ? wow.
Stay married to her 🙂Hmmm, do a quick ring with R&G UK and ask if they do crash bobbins for the bike, i can’t remember as i generally deal with the GT650s and i know they exist 100% , but St7 (GV700iC) makes you a unique club on our soil , look after it, they go anywhere you take them 🙂
Did the youtube walkaround videos help of others posting their bikes especially when they doing exhaust sound checks ?
Hmmm, the headlight bracket would suit the face fairing the blue ones you see on ebay and they also expect you to bolt in a 7.6inch headlight , which we have a few (both the glass) and the (housing back) of it too, then you should be OK.
The dash is mounted separate with its own GT bracket that was linked to you which also joins the lower headlight bracket for stability. Waterproof the harness very well if going naked!
Visually?
How about these for most bolt on ?
https://www.ebay.co.uk/itm/256002660316
https://www.ebay.co.uk/itm/255976367096
https://www.ebay.co.uk/itm/255972934812
https://www.ebay.co.uk/itm/255947344973Now you can still use your oem indicators too.
The real issue now…
GTR harness for “headlight” potion will need rewiringIt is advised to buy another “Headlight Harness” for GTR that is damaged , as a way to custom fit “GTR Main Loom” to GTR headlight (retrofitting) to GT headlight
OR Universal for that matter.Universal = Generally i avoid them , but just be sure whatever seller says should have 45-60mm brackets to hold it to the forks, but you can always measure fork legs. The fork legs have dips that can drop or rise its thickness.
What about your dashboard ? use this mount below
https://www.ebay.co.uk/itm/255997354711Did this help ?
Before i can advise about bars , switches , next , unless you know what you are doing 🙂
The ad says 20w , i assumed every bulb , then its 80watts if all light up at once! – Could cook the harness since if you notice your highbeam lights draw 55w, and their wires are thicker than the indicator wires ( watts vs current (amps) vs ohms, if you want to get technical calculating it yourself) = The harness has a 15A rating.
Hopefully the seller said its actually 5w per bulb 🙂 , after a ride just check the buzzer winker relay isn’t hot or anything.
Hey,
We have a listing for the lever, that i can confirm it is compatible with yours as the “2014” model still uses the one below (a bit tatty but can always paint it up?)
https://www.ebay.co.uk/itm/256028459017ST7 did get discontinued a few yrs later , but Korea has changed parts there and there across their models even the 2001 GV125 had factory 1nch bars than 2007 using 22mm ones, but some sellers think its universal across the board , just becautious out there. if in doubt , email me (ill get it from local wholeseller) or ring Startright Leeds (oldest hyo dealer) , mention my name to jump the queue .
Hey,
The bike engine (clutch, crank, etc..) all use the same oil. Max capacity is 1.5LRecommended oil (in my own bikes and what i put in customer machines)
– Motul 7100
– Motul 300v
– Silkolene Pro 4
– Silkolene Comp 4Get 10w40 grade. Don’t buy “20W” grade, as its too thick, not needed for this UK climate anyways (we don’t get sahara desert temps over here)
It is recommended to change the oil filter every time the oil changes, to prolong engine life.
Thanks Marcel, great video! Would your diagnosis be correct even though with no load, in neutral, it revs perfectly?
it is what one of our GV donor’s did, the carb was being a nuisance so had to reset the whole thing and re-do it all up, in fairness , it also needed engine clearances doing as last owners didn’t treat it well.
I meant “choke/chock” (english is weird) as in , if you ride faster , the bike feels like its being strangled by its neck.
That would be your carb slides fella , they should be freely moving up and down , without so much as a disturbance intheir cylinder walls of the carb unit
Though around 4k – 7k rpm is slide territory , after 8k ish , they should be fully lifted , drinking main jet fuel.
Take a look at this video, it is “exactly” how our carbs behave based on situation and throttle action.
Check your PM on this forum, you should have a orivate forum message from me direct.
