Akunar parts FXR?

[CHOPPA]

Im want to make my FXR engine a bit quicker, im aiming for around 200hp but if I get 10% of that id be happy...

These Akunar parts seem good, im thinking a new piston, exhaust, cams, valves and a carby from them. I have heard people having problems with the pistons but I will leave the standard rev limit so hope they will be ok.

Is it the Pro R piston I need? What size pins and deck height? What size valves do I order??

Has anyone tried the cams?

I will get someone to port the head for me

http://www.akunar.com/

[Yow Ling]

if you only want 10% then you dont need to worry about the bigger valves, the cams seem to work, not sure if you need the proR but maybe you do !, just ask for a 64mm raider 150 piston

[crazy man]

think the cams are not as good as stock

[ducatilover]

I've got a 95mm piston here...and a few longer throw cranks from GN/DRs. Nobody will know.
:innocent:

[kel]

Some of my cam data - Akunar is the winner for duration and lift, clearly too much exhaust.

Standard FXR
in lift 6.95mm
ex lift 6.1mm
valve timing @1mm lift IVO 0 BTDC
IVC 42 ABDC 222deg
EVO 24 BBDC
EVC 3 ATDC 207deg

Kelford Cams
in lift 7.78mm
ex lift 6.63mm
valve timing @1mm lift IVO 16 BTDC
IVC 39 ABDC 235deg
EVO 42BBDC
EVC 9 ATDC 231deg

Akunar Cams
in lift 8mm
ex lift 7.6mm
valve timing @1mm lift IVO 20 BTDC
IVC 60 ABDC 260deg
EVO 57BBDC
EVC 17 ATDC 254deg

Had a pair of the GPR cams up here recently but the guys were in such a rush to put them in I didnt get any measurements.

[crazy man]

Some of my cam data - Akunar is the winner for duration and lift, clearly too much exhaust.

Standard FXR
in lift 6.95mm
ex lift 6.1mm
valve timing @1mm lift IVO 0 BTDC
IVC 42 ABDC 222deg
EVO 24 BBDC
EVC 3 ATDC 207deg

Kelford Cams
in lift 7.78mm
ex lift 6.63mm
valve timing @1mm lift IVO 16 BTDC
IVC 39 ABDC 235deg
EVO 42BBDC
EVC 9 ATDC 231deg

Akunar Cams
in lift 8mm
ex lift 7.6mm
valve timing @1mm lift IVO 20 BTDC
IVC 60 ABDC 260deg
EVO 57BBDC
EVC 17 ATDC 254deg

Had a pair of the GPR cams up here recently but the guys were in such a rush to put them in I didnt get any measurements.Akunar Cams
dont seem to bad after all but need to see the hole read out. will post a read out of the yoshy grind tomorrow

[Grumph]

Interesting - first time I've seen this comparison. Have to say that Kelfords are the only ones close to what I'd consider correct lobe centers. Most of the 600 fours run best around 102/104...
akunar are coming into the lift area I'd consider reasonable too.
On balance, without seeing Crazy's Yosh figures, I'd try the Akunar on 102/104 centers....

[kel]

Interesting - first time I've seen this comparison. Have to say that Kelfords are the only ones close to what I'd consider correct lobe centers. Most of the 600 fours run best around 102/104...
akunar are coming into the lift area I'd consider reasonable too.
On balance, without seeing Crazy's Yosh figures, I'd try the Akunar on 102/104 centers....

Well as I no longer have an FXR the infos all up for general viewing. The centrelines of the Akunars were in part dictated by valve to piston clearance and as the bike made 20hp first run on the dyno there seemed little point in machining the piston to get them closer to where they should have been. Akunar provides zero set up data so it's suck it and see.
YZF600 kit - in 8.8mm 262deg 22/60 109 centre, ex 8mm 250deg 55/15 110 centre - but then its reving to 16k. This and running the akunar numbers through Lotus le software (with exhaust and inlet data) influenced where the akunars were set.

[CHOPPA]

Good information, thanks guys! Is the bore a cast iron thing that I can bore out to oversize or does it need to be sleeved?

[Kickaha]

Good information, thanks guys! Is the bore a cast iron thing that I can bore out to oversize or does it need to be sleeved?

Cast and you can replace the sleeves

[CHOPPA]

What size valves do i need?


<tbody>

Inlet Valve OD


Exhaust Valve OD


Valve Length


Valve Stem Width



















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22.00mm
82.00mm
4.50mm
AKV24228245
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22.00mm
85.00mm
4.50mm
AKV24228545
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27.00mm
23.00mm
65.50mm
5.00mm
AKV27236550
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28.00mm


24.00mm


65.00mm


5.00mm


AKV28246550


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28.00mm


24.00mm


72.00mm


5.00mm


AKV28247250


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28.00mm


24.00mm


80.00mm


5.00mm


AKV28248050


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30.00mm


26.00mm


65.00mm


5.00mm


AKV30266550


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30.00mm


26.00mm


72.00mm


5.00mm


AKV30267250


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30.00mm


26.00mm


80.00mm


5.00mm


AKV30268050


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26.00mm
72.00mm
5.00mm
AKV31267250
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27.00mm
72.00mm
5.00mm
AKV31277250
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27.00mm
80.00mm
5.00mm
AKV31278050
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</tbody>

[kel]

fxr150 valves
in 2 x 23mm, stem 4.47 mm
ex 2 x 19.75mm, stem 4.45 mm

CRF150 for comparison
in valve 2 x 26 mm
ex valve 2 x 22.5mm
valve timing @1mm lift
IVO 15 BTDC
IVC 48 ABDC 243deg
EVO 50 BBDC
EVC 25 ATDC 255deg
inlet valve centreline 106.5
exhaust valve centreline 102.5

and the ported FXR inlet with 28mm carb is good for 120cfm. I'll miss the old 4 stroke :weep:

[CHOPPA]

Whats the most important bit I have to match up when sizin? Length of Valve and Stem size? Then find the suitable valve..

[hmurphy]

My god. Why not just do cams and porting and leave it at that!? Can't have you getting more HP than me mate or I might have to start crashing more... or God forbid spend more feckin money on my bike.

[CHOPPA]

No point taking the head off twice mate :)

[Yow Ling]

No point taking the head off twice mate :)

Have you put a new rod kit in it yet, no point in doing the head and having the rod sticking out the side

[crazy man]

No point taking the head off twice mate :)happy Birthday

[Clivoris]

Go for it Chop. You don't muck around do you?

[CHOPPA]

Go for it Chop. You don't muck around do you?

Ill leave the engine alone untill December when racing starts then ill give it a rebuild so its faster than Hamish's bike haha give me a couple of months to order parts...

Ill consider doing the rod but if I pull the bottom end apart then id have to do all the bearings etc which is not a silly idea.

Maybe the first build should be limited to porting, cam, piston and carb

[hmurphy]

Maybe the first build should be limited to porting, cam, piston and carb

Yeah. Maybe it should be. :Police:

[Kickaha]

Maybe the first build should be limited to porting, cam, piston and carb

There's a lot of big ends gone bang in FXRs you're better off doing the rod kit as well

I got highsided when a big end seized and I saw another guy go down at BOB with the same thing

[CHOPPA]

There's a lot of big ends gone bang in FXRs you're better off doing the rod kit as well

I got highsided when a big end seized and I saw another guy go down at BOB with the same thing

Sold!

What rod do ya recommend? Hakuna or OEM

[Pumba]

Sold!

What rod do ya recommend? Hakuna or OEM

OEM or TKRJ (pretty sure the come from the same factory)

Although have always been interested to see how long the cheap ones will last. I mean what could go wrong:shit:

[speedpro]

I just bought a whole new head for my scooter. 4-valve head with 24mm intake and 22mm exhaust valves - US$263.20. Choice of 6 cams all for US$63.20 including two roller bearings.

[codgyoleracer]

No point taking the head off twice mate :)

Dont stop their Choppa , the short stroke crank with even bigger psiton will be the next natural step.

[CHOPPA]

Dont stop their Choppa , the short stroke crank with even bigger psiton will be the next natural step.

Provided I can get the part off a shelf I will do it lol

[crazy man]

Dont stop their Choppa , the short stroke crank with even bigger psiton will be the next natural step.✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

[Sketchy_Racer]

Provided I can get the part off a shelf I will do it lol

Mate you should ditch the FXR motor, there are heaps of awesome off the shelf parts for 85cc MX engines :laugh:

[jasonu]

I just bought a whole new head for my scooter. 4-valve head with 24mm intake and 22mm exhaust valves - US$263.20. Choice of 6 cams all for US$63.20 including two roller bearings.

Wot, do you have a coal burner now Green???:confused:

[speedpro]

It actually is a scooter, commuter type of thing. Was 125cc now 203cc. Just got the customs bill - bastards!

[gav]

I have to say Akunar are awesome to deal with, especially if you deal with the main man direct, Rakuna Davis. I ordered cams and o/s piston a while ago and it never arrived :( He was good enough to send replacement parts. Bit of a cock up all round. NZ Post had no record of it even arriving in the country but the original package turned up back at the Thailand Post Office, after apparently making it's way to NZ but being unable to be delivered as the address on the parcel wasnt correct. Was just a shame that NZ Post still insisted they had no record of it here in NZ, oops :tugger:.
Anyway you can email him direct and ask what you want regarding the FXR, sales@akunar.com Just ask about 1mm oversize valves, H/D valve springs etc. Apparently it appears that some FXR's here in NZ have FXR125 cam shafts in them, some have a 6mm bolt for the cam sprocket and some have a 5mm bolt (125). They also use to do a complete head, with oversize vales, springs, race cams etc but unfortunately it's too expensive now as they need to source a new head.

[kel]

IApparently it appears that some FXR's here in NZ have FXR125 cam shafts in them, some have a 6mm bolt for the cam sprocket and some have a 5mm bolt (125).

You dont need the plugs in the ends of the cam shafts either, and the reason the shafts wont fit the locator slots in the retainers well thats the 125 again I guess.
Apparently Im the only one to have had these issues, problem is there are 3 others I know of running the Akunars that had exactly the same problems. The shafts can work quite well, its just a shame they need to be modified and come with zero set up data (or support).

[crazy man]

271814just copy and blow this up. remember 40 thou is very close to 1mm