One for you 2 stroke nuts

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Had a little mishap with the new Lifan 150 engine. It's dropped a gear and I cant be arsed to split the cases just to replace the gearbox.

So, I had access to a TZR engine which was doing nothing. I've got access to a MIG and an OXY welder. So I thought why the fuck not.

Not got very far yet, Managed to get the engine fitted into the bike on a temp basis. Just to eye up what needs to go where.

Engine mount wise. The 2 back mounts can be made up from steel plates.
The front bottom mount wont be mounted to the frame as its an open pit bike frame, So I'll use these to mount my bash guard.

The top cylinder head mount I will weld a plate to the bottom of the frame, Drill/tap it, And secure it there.

Hard part is going to be getting an exhaust to fit.

Heres a few pics.

https://img.photobucket.com/albums/v358/binge/Photo0121.jpg

https://img.photobucket.com/albums/v358/binge/Photo0122.jpg

https://img.photobucket.com/albums/v358/binge/Photo0123.jpg

https://img.photobucket.com/albums/v358/binge/Photo0128.jpg

https://img.photobucket.com/albums/v358/binge/Photo0129.jpg

26bhp~ I believe. 6 speed gearbox. The engine is designed to drive an 18" rear wheel. So it should be a little weapon. Smile

Ben

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

That is more like it Mr. Green

SM.Morgan · Traffic Copper Joined: 04 Apr 2007 Karma :

^^^

Could have bet you'd be the first to post.

Looks like fun binge, keep us updated.
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Harley XR1200

Whosthedaddy · Super Spammer Joined: 11 Dec 2005 Karma :

Any reason as to why its always the TZR engine thats used in the pit / monkey bikes? I imagined it to be more of a tight fit under the frame but it looks right at home. Just need a side mounted rad like on a crosser and the exhaust to come the other maybe?
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Current : MSX 125 Past : CBR 900RR Monkeybike : c50 LAC : ZXR750 H2 : FZR600 : ZX7R P3 : YW100 : TRX850: Trophy 900 T309 : GSXR 600 L0: Monkeybike : XJ6S Whosthedaddy

davthegreat · Scooby Slapper Joined: 30 Aug 2008 Karma :

thats fat

The Artist · Super Spammer Joined: 06 Jan 2008 Karma :

Fantastic! Mr. Green

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

lllN30lll · World Chat Champion Joined: 12 Jun 2005 Karma :

now that's a proper engine to have in a pit bike.

Really looking forward to seeing it running and a top speed run Laughing

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Turbo R1
CRF450R

Welshd1k · World Chat Champion Joined: 03 Oct 2006 Karma :

thats gonna be fucking lethal i want ago please
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Current >Cb600fx hornet, ns125rk90 21.7bhp@wheel<
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BenR · World Chat Champion Joined: 23 Jun 2008 Karma :

Where you going to put the rad? Will be mental when it's done. Twisted Evil

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Current bikes: suzuki RG125UN wolf. Yamaha MT-07

Gazdaman · I did a trackday!!! Joined: 12 Aug 2004 Karma :

Good work, I'll be watching this closely.

Gaz

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

The tuned length will be critical. I'd suggest trying to get someone to custom make an expansion chamber with the same volume and chamber dimensions as a TZR exhaust but curved around to fit the pit bike.

It is doable, my Two stroke tuning book explains how it is done, but you really really need to know what you are doing.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

BenR · World Chat Champion Joined: 23 Jun 2008 Karma :

What about modifiying a scooter exhaust? Like a DNA/runner pipe?
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Current bikes: suzuki RG125UN wolf. Yamaha MT-07

ZBD · Nitrous Nuisance Joined: 10 Aug 2007 Karma :

Do not know where you are based but this guy is great

https://www.higgspeed.com/
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Alcohol is the answer, it's the question I forgot ....

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

I'm pretty limited to space thats all.

I've still got to find a way to mount the carb! Its very close between the inlet port and the frame.

Might have to get a custom manifold which brings the carb out at an angle. Not too sure yet.

Might even have to get a different frame which isnt twin tube.

Ben

ms51ves3 · Super Spammer Joined: 07 Jun 2007 Karma :

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

I'm just very limited with space that's all.

I'd like it to run under body because I think it looks tech on the Supermoto bikes. BUT I wont be able to have the bike up on the stand to change the tyres.

Having it run over the top of the engine limits my space even more. I need to find a home for the carb yet.

Ben

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Not sure what the score is with this.

It's a pipe made for the RM65. My bike is based on the KLX110 (which is basically an RM65 with a different engine).

So it will fit the bike how I want it to. I'm just worried about the diameter of the pipe work being too narrow.

https://i6.ebayimg.com/08/i/001/31/66/684e_1.JPG

mattsprattuk · Super Spammer Joined: 12 Mar 2007 Karma :

what about a DTR exhaust? same engine etc.

when are you going to mount the engine properly?
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Had another go at it in the garage tonight. I've made the bottom engine mounts, And fitted them up.
Just got to fab up some top engine mounts now.

I've offset the engine to the right by 33mm so the sprockets line up. So the mount on the cylinder head will need to be modified. Or I will need to weld a plate to the underside of the frame tube and have that offset by 33mm too.

I'm considering changing frames again. Back to a standard style "swan neck" frame, Rather than the Twin tube trellis frame. I need more room between engine and frame basically.

Looking into DT exhausts at the moment. I dont want to spend loads of money until I am sure it will fit and work.

Fitting the carb is my main concern.

Ben

400bandit · World Chat Champion Joined: 21 Dec 2005 Karma :

I doubt these will be of any use but what they hey

https://monkeybike.co.uk/acatalog/Carburettors_&_Manifolds.html

Cool project!

Joe
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Current Bikes 650 Honda Bros, VTR1000 Firestorm // Past Bikes: Sachs Madass 50/110cc - Bandit 400 - FZR750
(+ a XS650 in lots of pieces in my garage and other places...)

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Not really. But I've been looking at pictures of DT125 engines. And the Inlet manifolds seem to be at a 45 degree angle on them.
So IF a DT125 inlet will fit the TZR125 engine, Then I'm laughing.

Ben

bykerbaz · Derestricted Danger Joined: 24 Feb 2009 Karma :

the dtr inlet comes out on an angle and fits straight onto the tzr lump
its a different shape to the straight tzr one and should be just the job for you Very Happy

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