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Kiwi Biker forums > Bike mechanics > Engine - Clutch - Transmission
custom V twin from two singles

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#1 Yesterday, 08:19
Tints
Scooter boy

Bike: 2000 suzuki FXR 150
Location: Auckland
Posts: 39





custom V twin from two singles

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I'm building a Custom 90 V twin from two Yamaha 250 dirt bike engines for a small race car and have hit a small problem with the head bolts.
The problem is with the new crank case that has been machined the old bolts are too long to fit ( they sit under the cams) and so I need to find some new ones. The bolts need to be the proper yield bolts with a wasted shank, forged etc. Does anyone know of a bike engine that uses a 110 or 120mm long bolts that has a thread of either 9 by 1.25 or 10 by 1.25.
I have talked to ARP bolts and they don't have anything in the right size. does anyone know of any other companies that might do them?

Bellow is a picture of it made up with its dyno crank case (there will be a trans axel built later.) The crank is being balanced at the moment and we hope to run the engine in about 3 weeks.
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#2 Yesterday, 08:51
jonbuoy
Hardcore Biker

Bike: 77' CB750 Cafe Racer Project
Location: Auckland
Posts: 686




Impressive work there

http://www.aperaceparts.com/
http://www.northernautoparts.com/Pro...?ProductId=334

These guys might be able to help. They seem to call them cylinder head studs in the states.


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#3 Yesterday, 09:06
Macktheknife
Gene Pool Cleaner

Bike: 1992 VS1400, 2001 Bandit 1200, KDX 200
Location: Auckland,New Zealand
Posts: 2,833




Any reason you can't just cut them down to size?
Failing that try MSL in Rosebank road, Avondale or Atom fasteners or WDS in East Tamaki. There is also a nut and bolt shop on Constellation Drive but I can't remember the name of it, almost last on the right heading towards East Coast road.
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#4 Yesterday, 20:24
Buddy L
"2 stroke" smile on my dail

Bike: dirty cr125, and even dirtyer k6 6hundy
Location: Auckland Central
Posts: 399





i was just going to sent you this link
http://www.fsae.co.nz/
tell you to talk to people a Auckland Uni.
But then i saw you profile. and found out that you would be talking to your self
You know that would make a nice Formula 3 motor, to slip into a RS125 frame
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#5 Yesterday, 20:31
Buddy L
"2 stroke" smile on my dail

Bike: dirty cr125, and even dirtyer k6 6hundy
Location: Auckland Central
Posts: 399





Are you using two WR250f motors?
or the YZF250?
Why the change from the R6 motor?
trying to get a flatter toque curve.
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#6 Yesterday, 23:30
slowpoke
Wristful thinker

Bike: 2 slow, 2 black, 2 bad
Location: Wairarapa
Posts: 625




Sorry mate I can't help, but I've got say what an awesome effort that thing is. I'm guessing if you shorten the bolts you've got you won't have any thread left so I'll leave that well alone.

Oh yeah, once you've finished with that tiddler could you knock me up something similar with a couple of Husaberg 650 cylinders when you've got a spare 5 minutes? Ta....
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#7 Today, 19:39
surfer
Hardcore Biker

Bike: 1982, Yamaha xs650 chop
Location: North Shore
Posts: 217




The 'bolt shop' in near the police station on one of those roads off Wairau Road are excellent for bolts. Never seen two old guys happy as dealing with bolts all day long.


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Discussion Starter #2
:coocoo Well i stuffed that up...........if anyone reads this and knows the answer to the original question re bolts i would be well grateful............
 
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