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Gs1000s winter Engine rebuild

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Guest
just thinkin what i need this for this winter Engine rebuild.
so far i have got a wiseco 1085cc kit heavy duty studs nuts head has already got Bronze valve guides seals fitted crank will be welded got a manual camchain tensioner,Gs has done
90,000mls+ and goin to fit new camchain while its apart.
I am not goin to put performance cams in it want to keep her reliable.
but would it be worth fitting slotted cam sprockets to get timeing spot on.
im goin to get a prof Engine builder to do the work ,as cant afford anymore slip ups been caught out once cant afford another one.
wondering about the gearbox bearing might need replacing.
All parts I have were supplied by Ape perfomance.

any idea what sort of Bhp it would produce when its sorted. 90bhp maybe.

Thanks
steve
 
Last edited:
gshub said:
just thinkin what i need this for this winter Engine rebuild.
so far i have got a wiseco 1085cc kit heavy duty studs nuts head has already got Bronze valve guides seals fitted crank will be welded got a manual camchain tensioner,Gs has done
90,000mls+ and goin to fit new camchain while its apart.
I am not goin to put performance cams in it want to keep her reliable.
but would it be worth fitting slotted cam sprockets to get timeing spot on.
im goin to get a prof Engine builder to do the work ,as cant afford anymore slip ups been caught out once cant afford another one.
wondering about the gearbox bearing might need replacing.
All parts I have were supplied by Ape perfomance.

any idea what sort of Bhp it would produce when its sorted. 90bhp maybe.

Thanks
steve
Click to expand...


1085 kit is a good starting point HD studs not required but if you already have them you might as well fit, recut the valves when you have guides fitted, HD valve springs are a good idea at that milage
welding the cranks a good move new cam chain is a definate while motor is split
with performance cams theres no reason they should cause a lack of reliabilty a nice stage 1 "road & track" grind
if you retain the std cams theres really no need to slot the sprockets ive checked alot of std cams over the years generally they are within a few degree's
the gear box bearings are a case by case depending on how the bikes been treated over the years if in doubt ... replace
throw on a nice set of smoothies and you will easily get 100 plus hp
Oz
 
Last edited:
gs1000 rebuild

gs1000 rebuild

Thanks for reply Ozman.
but please keepem coming,the other reason im not fitting performance cam is the price
also I dont ride as fast these day either.
It must be me age "wifey says im growing up at last".


steve
 
All that sounds good if you're including new camchain guides

Dialing in the cams won't hurt, you can always slot your own sprockets

What about the clutch basket?

Mine pulled 85.5 rwhp after similar mods
 
Hope I'm not pushing this thread off course but it's my understanding that the GS750 cams will drop into a GS1000 and are a little bit more aggressive. TRUE??
 
Last edited:
DMorris said:
Hope I'm not pushing this thread off course but it's my understanding that the GS750 cams will drop into a GS1000 and are a little bit more aggressive. TRUE??
Click to expand...

Not true. The cam lift specs are the basically the same although the 750 cams have a smig more duration (not enough to matter).
 
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Nessism,

I wasn't thinking as much lift as duration but I'll take your word for it.
I just thought I remembered an article in one of the motorcycle mags (long ago) giving the cam swap in conjunction with a change in cam center timing as a recommended tweek for the GS1000.
 
Gs1000s Engine mods

Gs1000s Engine mods

Big T said:
All that sounds good if you're including new camchain guides

Dialing in the cams won't hurt, you can always slot your own sprockets

What about the clutch basket?

Mine pulled 85.5 rwhp after similar mods
Click to expand...

What about clutch Basket good Question its def got heavy duty springs in clutch
the Basket has Damper springs fitted which are Ape and been welded in apparently.
That what I was told and payed for,well it stopped horible rattle it had.

Thanks
steve
 
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Gs1085 rebore.

Gs1085 rebore.

I fitted Ape head studs and nuts to my bike
but have been told the studs restrict oil to the topend any body heard of this?.
If its true is it worth fitting higher out put oil pump gears if so "where do I get them from".

Thanks
steve
 
gshub said:
I fitted Ape head studs and nuts to my bike
but have been told the studs restrict oil to the topend any body heard of this?.
If its true is it worth fitting higher out put oil pump gears if so "where do I get them from".

Thanks
steve
Click to expand...
I'm not an expert on those motors, but if you have oversize studs you may want to invest in a top end oiler kit. This is is the oil to the top end passes through the stud area. If not then forget what I said.

I second the motion on new cam chain guides. If yours are like mine, they are grooved and worn to the point they should be replaced. APE should sell them.
 
No worry about the studs restricting oil, that's a fallacy. And the 8V engines don't use "top end oilers", that's for the 16V stuff.
 
APE studs and nuts are a waste of money unless you are going to increase the compression ratio to 13-1 or higher. the stock ones are just fine

.395" cams are a trick modification for hot throttle response. they drop right in.
manual camchain tensioner is a MUST
clutch basket NEEDS to be strengthened
2nd and 3rd gear should be back cut on the engagement dogs if you are going to roost this engine in street trim

there are 2 oil pump ratios 29/38 from a 750 or the 33/34 that pumps PLENTY of oil (rumors abound )
 
gshub said:
just thinkin what i need this for this winter Engine rebuild.
so far i have got a wiseco 1085cc kit heavy duty studs nuts head has already got Bronze valve guides seals fitted crank will be welded got a manual camchain tensioner,Gs has done
90,000mls+ and goin to fit new camchain while its apart.
I am not goin to put performance cams in it want to keep her reliable.
but would it be worth fitting slotted cam sprockets to get timeing spot on.
im goin to get a prof Engine builder to do the work ,as cant afford anymore slip ups been caught out once cant afford another one.
wondering about the gearbox bearing might need replacing.
All parts I have were supplied by Ape perfomance.

any idea what sort of Bhp it would produce when its sorted. 90bhp maybe.

Thanks
steve
Click to expand...


OOoh nearly forgot to ask what oil do I use once she is up running
at the moment using a Duckhams 20/50 mineral oil which it seems to like
but not sure if wiseco 1085s would.
do I just go back to a castrol 10/40 mineral oil .
 
Last edited:
gshub said:
OOoh nearly forgot to ask what oil do I use once she is up running
at the moment using a Duckhams 20/50 mineral oil which it seems to like
but not sure if wiseco 1085s would.
do I just go back to a castrol 10/40 mineral oil .
Click to expand...

If you asked my dad he'd say Duckhams. I'd say GTX. There you go...the same family and we argue about oil!
 
Hellooo

Hellooo

hampshirehog said:
If you asked my dad he'd say Duckhams. I'd say GTX. There you go...the same family and we argue about oil!
Click to expand...

Now this oil subject is it everyone got there own choice or is it nobody knows
it seems a touchee subject .
trouble is motorcycle oil costs a fortune but is it better,than yer average car oil I ask.
 
gshub said:
Now this oil subject is it everyone got there own choice or is it nobody knows
it seems a touchee subject .
trouble is motorcycle oil costs a fortune but is it better,than yer average car oil I ask.
Click to expand...
Doc Brown in Portland, OR only uses Castrol Actevo. And he is quite possibly the baddest assed mechanic I have ever met.

I'm probably going to do an emergency overhaul on my own engine, by the way. It's for 60,000 on it, and is gushing oil from somewhere near the bottom. Does anybody have a tutorial for that?
 
hampshirehog said:
If you asked my dad he'd say Duckhams. I'd say GTX. There you go...the same family and we argue about oil!
Click to expand...


I'm not familiar with Duckhams oil but you couldn't pay me to run GTX in a motorcycle - zinc levels are too low for use in a motorcycle.
 
Cams or which ones

Cams or which ones

Decided to change my mind about putting cams in Im after more grunt and not
top speed as ride alot 2up ,wot works best web maybe yoshi been offerd a set Andrews cams second hand?.spec says 10mm lift Duration 256.50 hot street cams if that makes sence.
I know i will need new valve springs and got slotted sproxs sittin and waiting.
your veiws please.
Thanks
steve
 
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OOoooh commonn

OOoooh commonn

Come on someone must now whats what.
please help a old timer.
 
Well, I dont know a lot about the 2 valve engines, but I can say that I put bigger cams im my bike and I miss the low end grunt. The top end is great if you go fast all the time. Most of the time it is stoplight to stoplight and torque rules there. I would recommend degreeing what ever cams you put in to make sure they are in right, and you can tweak the centers to tune the powerband.
 
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