bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Sept 21, 2008 21:06:37 GMT -5
Hello all I recently purchased a XT 500 cylinder from Ebay. Im thinking about tuning my SR 500 some. I live in Norway so Kedo.com wich is in Germany is the closest i am to getting tuning parts. I already have a TM36 Mikuni carbie and KN airfilter on my bike. Im thinking about getting this used cylinder up to about 534ccm with a new piston and a new cam. Also thinking about removing the airfilter box and putting a new KN airfilter directly on my carbie. I have a kit for rejetting the carbie. Just hope its enough for these changes. Im hoping for about 40-45hp or more. I dont want to loose the sidepanels yet as i just had them painted last winter. But it should be possible to attach a KN filter without loosing them. Do any of you guys/gals have any advice regarding my tuning-dreams? I am willing to buy all the parts i need from the other side of the planet if its possible to save alot of cash and still get good quality and good tuning  I want the bike to perform better, but dont want to rebuild the engine every 5000km  Any input would be cool. Also advice on buying tuning parts elsewere then from Germany. Their prices are a bit stiff. But i really dont know of any other places. Regards Gunnar (Norway) |
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Post by solo2racr on Sept 21, 2008 21:31:57 GMT -5
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bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Sept 21, 2008 22:19:03 GMT -5
I read up on the pistons i can get my hands on. I can chose between a compression ration of 9:1 or 11:1 Both are 149 Euros for each set. The cams i can chose from i am unsure about. Both both these changes will need other changes. Other parts needs to be replaced with better parts or should i say with parts than can handle the tuning. Its hard to understand because im trying to read the info of a german parts catalog  Any input on the different compression rates? 11:1 seems very high to me? |
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Post by Just Plain Bill on Sept 21, 2008 23:21:11 GMT -5
You can buy Wiseco piston kits a lot cheaper than 149 euros by using a U.S. contact to sell and ship you the parts. My friend Gary McCoy works at a multi-marque shop in Sidney Montana (garymccoy@mondakmotorsports.com ). If you mention that you are a Yamaha Vmax club member, he can sell you either the 9:1 or 11:1 Wiseco kits for USD $123, plus shipping. If your customs rates are lower for used than new parts, Gary will even rub a little dirty oil on the piston. If the cams you're interested in are sold though Part Unlimited or one of the other US distributors, he should be able to get you a pretty good price on those too. At least if they are made in the U.S.A. I've bought a lot of parts from Gary -- even a new Honda Goldwing in 2004, always with good savings. He has arranged with the shop owner to give special discounts to Vmax guys -- but Gary isn't strict about who is and who isn't a Vmax guy. You can also find SR/TT/XT500 Wiseco kits on eBay for USD $125-145, depending on bore size and compression ratio. Bill |
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bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Sept 22, 2008 0:04:54 GMT -5
Thx Bill! That is way cheaper than the german company i usually buy from. Im adding this thread to my bookmarks so i can pull it up whenever i need to. Again thx a bunch  |
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Post by wotavidone on Sept 22, 2008 0:32:33 GMT -5
One observation: 40-45 HP is a lot. It will be interesting to see if you can keep the rideability and reliability up with such a beast. What a weapon it will be though.
Mick
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bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Sept 22, 2008 1:02:41 GMT -5
I guess its alot when the original HP is 33, but i remember sending the guys at Kedo a mail asking about just how much HP one could get out of a SR 500 engine.
I cant remember it excatly, but the max was 65HP. Ths was ofc for racing and the engine had to be rebuildt very often.
40-45HP wasent to much, at least not for Kedo. One could ride like 40-60.000km with those modifications.
But for as the rideability and reliability i dont know. Like now my bike starts and runs great. All it wants is to be used often. If i do that i doesnt act up at all.
Im told that with a tuning cam and piston the bike will be more "moody". For instance the "idle" will jump up and down. It might be harder to start.
Before i do any more tuning to my bike i will ask the people from Kedo about how it will affect my bike. And if it turns out that it wont run proper after tuning, well then i got all the original parts to put back in the engine.
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Post by caferacercarl on Sept 22, 2008 3:00:50 GMT -5
50% up from STD isn't too wild, you can get cams with no "jumpy idle", the wiseco part [except 90mm] are 10 and a half to one comp and are fine on pump fuel [95 octane or up] buy a degree cam wheel and split the lobe centres to get rid of the jumpy idle, it will be easy to tune, a good port job is required as are good valve spring kit. go for it!
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bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Oct 7, 2008 3:16:55 GMT -5
I am now just going to get a nice lumpy cam and not do the "big-bore". Also gonna lose the airfilter-box and get a nice KN filter for my TM 36 mikuni carbie, and a filter for the engine. This way the engine should run nicely and should be easy to start. Not sure how much HP ill get, but im told that most of the added HP lies in a new cam. I need to cut back on going bananas when buying parts anyways |
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Post by solo2racr on Oct 7, 2008 3:40:27 GMT -5
Careful when choosing a new cam. Many will require cutting the valve pockets deeper. If that is the case for the cam you choose, it may very well be cheaper to get the Wiseco piston. It will accommodate higher lift cams than a stock piston can.
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bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Oct 7, 2008 5:11:54 GMT -5
The cam ive chosen is from kedo i germany. The only thing i have to "modify" is reinforeced valve rockers wich i already have. Im sure i have to rejet and adjust my carbie, but i have a set for that and a buddy who is a great mechanic....wich im not |
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Post by hudriwudri on Oct 7, 2008 17:06:33 GMT -5
Hello there,
Sorry if i might sound a lil dellusionating but i feel of personal experience that 40-45 Hp on a streetdriven SR is almost non possible without "MAJOOOOR" surgery as the Head simply does not supply a big enough quantity of air nor a satisfying quality of mixture to supply that without major porting work.
Originally a stock SR has about ~"25"horses on the rearwheel.
Good ( and i mean good) 500 cc racers are quite over 50 rw horses and some might be even slightly rubbing on the 60 horses mark.
where the 65 horses should come from besides a major longstroke job with an allready to short con rod seems a mistery to me also the sideforces on the piston should be quite considerably enhanced.
But i can assure that as long as you dont use the 62, X18, grind you should not run in any problems resulting in lumpy idle or an overly cammy bike etc. as all of the other cams have somewhat reasonable overlap area and i myself rode for almost a decade with the 130 grind on the streets. Nevertheless the TDC lift distance to the piston must get checked.
Also there is in germany a very advisable piston manufacturer by the name of woessner who actually makes really nice pistons in superior materialquality for the sr. But if you can get the newer slipper style wiseco for a tasty price (the named 139 bucks sound the like =) )thats even the better as the old round skirt wiseco where quite questionable.
If i m allowed to utter my humble opinion i would suggest as words of advice in the following order:
1. A nice porting job by somebody knowledgable with the particular port of the SR / XT because otherwise you might pay for a pricey disaster.
2. 38-40mm Carburetors, preferably the TM36/38mm carburetors seem to be good for streetdriven bikes.
3. a good camshaft, following ones would be nice:
*MC 130
*WB 2
*or try to find a cam by some folk nicknamed HIHA in the german Sr-forum (www.sr500.de) as these cams are "very" proven even without "race springs" (considering a weak rockerassembly as is) and are very nice for your wallet.
last but not least i would suggest any good header muffler combo in order to get rid of the exhaust charge.
I hope i havent forgotten anything but thats it for me in such a glimpse ;-)
kind regards
Christian
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bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Oct 8, 2008 17:57:38 GMT -5
I mailed Kedo and asked some more regarding my tuning plans. I have the TM36 Mikuni carbie with a complete jet-kit. I also already have the reinforced valverockers because of work i did to my engine when my camshaft went "poof". I have orderd a original Yamaha cam from kedo wich has ben worked into a tuning cam. That way i have a original one thats unused almost and a tuning cam. I have also orderd a big KN airfilter and a filter for my engine. I am not going to change my piston. I dont see the need to after my respond from kedo.com. And i already have a supersound exhaust with a supertrap setup in the endcan. Here is the respond from kedo: "Hello again, regarding your today´s order everything´s looking good. In order to support the modifications you made and plan to make, we recommend in addition the Supertrapp exhaust ( at best in combination with an open downpipe, e.g. #91516, stainless steel ) for best sound and performance. This combination should offer an engine power of at least 42-45 hp. A Wiseco piston is not a must, as long as the original piston is in a good shape. Or in other words: in our SR-racers ( see catalogur page 185 or 39 ) we use the genuine Yamaha pistons. For the 30086 cam no special valve springs are needed." I hope they are right Gunnar in Norway |
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Post by FreakenI on Oct 8, 2008 18:01:48 GMT -5
Wanna share details on that great mechanic buddy bikerdude?? Im looking for a great mechanic buddy myself in this area.
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bikerdude1973
Junior Member
Yamaha SR500 Yamaha TRX 850 Honda XR600R
Posts: 35
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Post by bikerdude1973 on Oct 8, 2008 18:31:02 GMT -5
Hehe Fint å se en fra gamlelandet her. Jeg bor ca 5 minutter utenfor Haugesund på sør-vest landet. Kameraten min er utdannet bil, lastebil, mc-mekaniker og karroseriarbeider pluss at han kan lakkere ganske bra. Han bor ca 3-4 minutter på sykkel eller i bil fra meg. Han skrudde veldig mye før for folk og lakkerte nesten hver kveld. Men han har familie nå så han har trappet ned litt. Hans nåværende prosjekter er å bygge sin TRX 850 om til en streetfighter og få en eldre XL600R han har på veien. Xl600'en skal han gjøre om til supermoto om sommeren og offroad om vinteren. Han gjør dette for å spare penger siden det nettopp er kommet en stor bomring her. Jeg syns han er en fantastisk fyr. Veldig rolig og hyggelig. Der jeg ser problemer så ser han ofte utfordringer og ca 10-15 ulike løsninger. Jeg er pessimist av natur og han er totalt motsatt Hvis du har noen konkret spørsmål så kan jeg spørre deg for ham. Eller jeg kan forhøre meg og jeg ikke kan gi deg min eller hans mailadresse. Min mailadresse er sr500@online.no Hilsen Gunnar Erik |
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