GSXS 1000 Forum banner
1 - 20 of 29 Posts

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #2 ·
Rectangle Slope Plot Font Parallel
regardless of this dyno graph, im missing around 40 +psi of cylinder pressure, its been leaking past the pistons / rings, it lost around 30psi after i installed new piston rings with my teflon coated stock pistons, i had the cylinders diamond honed,and the cylinder head planed 10 thou and used a thinner head gasket to boost compression, so had thought it was sorted, ive measured up the pistons /rings, and cyl clearence, all well within std limits, today i called the cylinder replater's, he said it would require torque plates to straighten bores in cylinders....wish he had told me that b4 he honed them without the torque plates, which as far as i can determine is the most likely cause of my compression loss, as they must get warped by the crank cases and cyl head being tightened up to torque
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #3 ·
also found the starter clutch mechanism was catching/ rubbing , its body was quite blue looking from heating up, so i will replace that as well, it might be an isolated case but also might be worth checking when having your bike serviced
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #5 ·
update on the cylinders compression loss, ive called millenium tech in usa about some ?s i wanted answers to about the bore prep for replacement rings , and also big bore setups, seems the local co. here has basicly knackered my cylinder block, by diamond honing it without torque plates, plus they stuffed up the ring sealing due to putting too rough a finishing hone, so now my bores are out of round and theres probably not enough meat left to true them without risking chipping through the coating, so it looks like im going to send my block over to millenium to be recoated, also be sending my bro's sv1k cylinders to be bored and coated for the 2mm je piston kit im installing , guy there at millenium tech was very helpful, even offered to big bore it for free if i send it.....so now im thinking i might just go for a 76mm piston kit as well, as they boost torque very well, which is what i like in my engines, plus 190-200hp is possible with them...hahaha
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #6 ·
oh and so now i have a full set of stock new std bore pistons / rings / gudgeon pins & clips for sale, they fit all models of gsxs1k's, im open to offers so pm me if interested
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #7 ·
Well i couldnt find 76mm pistons thst would work with the gsxs combination of 16mm gudgeon pins and k7 style piston crowns, so now ive ordered a set of custom pistons from JE pistons, ive shipping my cyl block to millenium tech in wisconsin, they will work in conjunction with JE , then it will be shipped back in 9-10 weeks
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #8 ·
Rang millenium today, my cyl block has finally arrived, and my bro's sv1000 cyl's, now 30 odd days and it will be on its way back - probably 2wks more, ive also ordered a complete set of crank bearings, new camchain, str clutch, gsxr750k3 valve springs, new conrod bolts, and some oil upgrade parts- sae outlaw hi-volume oil pump gear & hi pressure releif valve, also installing new v&h s/steel valves, viton valve seals, k8 camshafts to run it in, then the kelford race cams......
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #10 ·
Been doing more research, apparently k7/8 comrods are the strongest stock gsxr k series rods, but thr 16mm wrist pins are stronger, so using tool steel 15mm pins with those k7 rods and some arp rod bolts provides strongest stock conrods , i still havent heard from je pistons about their piston weights, but cp 76mm are the same weight of stock gsxs pistons.
Next tidbit of information regards gearbox configurations, the gsxs uses the k5-8 gearbox which has a very tall 1st gear, there is an aftermarket gear from robinsons , this lowers the ratio in first a little, but ive found the earlier k3/4 gearbox is interchangable, it has much better ratio's for a roadbike, lower ratio 1st, 2nd, plus a taller 6th gear, which is something ive wanted, so im buying a low milage k4 gearset which i can get set up to go in my cases
 

·
Administrator
Joined
·
635 Posts
Next tidbit of information regards gearbox configurations, the gsxs uses the k5-8 gearbox which has a very tall 1st gear, there is an aftermarket gear from robinsons , this lowers the ratio in first a little, but ive found the earlier k3/4 gearbox is interchangable, it has much better ratio's for a roadbike, lower ratio 1st, 2nd, plus a taller 6th gear, which is something ive wanted, so im buying a low milage k4 gearset which i can get set up to go in my cases
Let us know how this turns out - very interested. Thx.
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #16 ·
Im still awaiting the custom JE pistons to be delivered to milleniun tech in wisconsin, they have bored and replated the block, but final sizing will be completed once pistons arrive, ive rang JE several times, the latest delivery date is around 25th feb for them to arrive at millenium, they are having material/labour issues due to covid pandemic ( apparently) so im unlikely to get the refurbished block b4 early - mid march.
Ive been carrying on getting all parts required, ive tested the fitment of the gsxr1000k2 gearbox, it is going to be a much better roadbike gearbox, with more even spacing of the ratio's, lower first gear, same 2nd, then continually higher ratios to top gear which is taller than the gsxr1000k7 gearbox the gsxs uses, and is a direct replacement
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #18 ·
I have to admit to salavating at the prospect of having a minimum 180+rwhp with stock k8 cams, and up to 195 with the mild race cams, its roll on torque im really looking forward to, the 3mm overbore pistons unshroud the inlet valves allowing much better flow, in- combo with the mild race cams (9.9mm/254° IN, 8.8mm/240° ex lift/durations) they should be enough to mimic stock k8 engine power delivery, but with a more stout level of power, so deliver 3rd gear roll on wheelies , 4th gear clutch ups....yee hah !!! , but i am being really careful with this build to try and ensure longevity, as its a roadbike foremost.
 

·
Registered
2016 f
Joined
·
606 Posts
Discussion Starter · #20 · (Edited)
Finally heard today!!! , the JE pistons have been finished and are on their way to millenium....ive been getting frustrated about the delays, chewing my nails with withdrawl symptoms, just a few more weeks till i can start reassembling it
Bad news today....JE have stuffed up my custom piston order, apparently cant read their own computer order form, though i actually suspect its been done out of spite due to the sole powersports representative being a complete tosser, so now ive got a 3mm bigger block awaiting some pistons over in the usa, looks like im going to have reconfigure off the shelf pistons , which are mostly 13.5:1 comp ratio, others are 10:1 to suit turbo's, if i cant get the off the shrlf ones remachined ill use a thicker cometic gasket plus maybe plane the block to get near optimum squish clearence, but lower compression figures, even millenihm tech are amazed at JE's tech guys arrogance, but its really been athe waste of 5 months of my riding time that pisses me off the most, and however long it will take to remedy a certain billy ramsey's incompetence
 
1 - 20 of 29 Posts
Top