Suzuki2Strokes.com

Sundial Moto Sports

Suzuki Two-Stroke Message Board
Suzuki2Strokes.com
It is currently Fri Jun 23, 2017 12:54 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 110 posts ]  Go to page Previous  1 ... 3, 4, 5, 6, 7, 8  Next
Author Message
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Mon Mar 20, 2017 1:59 pm 
Offline
Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 58
Country: Austria
Bikes owned: GT750
I have some new pictures to share. Today I married the frame and the engine - it is so easy with this frame, you just lift the engine into place from below.

Image

Image

Image

Image

Image

Image

Here it is in good company with some of my other bikes

Image


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Mon Mar 20, 2017 5:06 pm 
Offline
To the on ramp
User avatar

Joined: Thu Apr 21, 2011 5:32 am
Posts: 445
Location: North Carolina
Country: USA
Bikes owned: 1974 GT750 B-4 (JDM), 1975 GT750M
Coming along nicely Wolfgang! Your attention to detail is superb :clap:

_________________
Proud parent of Quads, Triplets & Twins:
1975 Suzuki GT750 M
1977 Yamaha RD400D
1988 Yamaha FZR400 3EN1 (JDM)
2016 Yamaha XSR900


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Mon Mar 20, 2017 5:24 pm 
Offline
Moto GP
User avatar

Joined: Fri Oct 24, 2008 5:55 pm
Posts: 3916
Location: Lancaster Pa.
Country: US
Bikes owned: GT750 x2 97 -1200 Bandit 86 GSXR1100
Very nice :up: You arnt going to be able to ride it anywhere without drawing a crowd 8) Whats going on inside the engine that you can share ?

_________________
the older i get the faster i was


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Mar 29, 2017 3:09 am 
Offline
AMA Superbike
User avatar

Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1633
Location: Blythewood, SC, USA
Suzukidave wrote:
Very nice :up: You arnt going to be able to ride it anywhere without drawing a crowd 8) Whats going on inside the engine that you can share ?



I see a lift plate......




Lane

_________________
If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Mar 29, 2017 7:25 am 
Offline
Moto GP
User avatar

Joined: Fri Oct 24, 2008 5:55 pm
Posts: 3916
Location: Lancaster Pa.
Country: US
Bikes owned: GT750 x2 97 -1200 Bandit 86 GSXR1100
Good eye Lane :up: maybe 3mm ?

_________________
the older i get the faster i was


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Mar 29, 2017 6:18 pm 
Offline
Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 58
Country: Austria
Bikes owned: GT750
There is not so much done inside the engine - I bought the engine as is. 3mm cylinder spacer, TR750-like porting (previous owner opted for 32mm exhaust from TDC - I hope this is not too radical!), cylinderhead shaved off 1,5mm, BARTON close-ratio gears, VM32 carbs, ACCENT ignition, JEMCO pipes.

Since I am not looking for a race bike and the engine tuning seems to be on the radical side, I am planning to change barrels and head over winter to a more conservative version. I want torque. I will try it as is first.


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Mar 29, 2017 7:03 pm 
Offline
Moto GP
User avatar

Joined: Fri Oct 24, 2008 5:55 pm
Posts: 3916
Location: Lancaster Pa.
Country: US
Bikes owned: GT750 x2 97 -1200 Bandit 86 GSXR1100
I am pretty sure what ever spacer you add under the cylinder you have to remove a like amount from the top just to keep compression the same , for a torque engine stick on some reeds 8)

_________________
the older i get the faster i was


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Mar 29, 2017 8:36 pm 
Offline
Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 58
Country: Austria
Bikes owned: GT750
Of course the barrels have been shaved off by 3mm. Correction on the carbs, they are VM34.


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Thu Mar 30, 2017 1:41 pm 
Offline
Moto GP
User avatar

Joined: Fri Oct 24, 2008 5:55 pm
Posts: 3916
Location: Lancaster Pa.
Country: US
Bikes owned: GT750 x2 97 -1200 Bandit 86 GSXR1100
wolfgangh wrote:
Of course the barrels have been shaved off by 3mm. Correction on the carbs, they are VM34.
Sorry , should have known better than to suggest :oops:

_________________
the older i get the faster i was


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Tue Apr 04, 2017 3:01 am 
Offline
AMA Superbike
User avatar

Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1633
Location: Blythewood, SC, USA
That engine set-up is a lot like mine. It still has a good bit or torque.



Lane

_________________
If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Tue Apr 11, 2017 1:32 pm 
Offline
Around the block

Joined: Thu Dec 05, 2013 12:32 pm
Posts: 58
Country: Austria
Bikes owned: GT750
Made good progress this week.
Completed engine assembly, installed Accent ignition, and mounted VM43 carbs and JEMCO Pipes.

Image

Image

Image

Fitted an external gas tank and started engine time. This thing is so F....g loud, I dont think any real TR750 was ever louder. Besides gettign air filter pods mounted, there is not much more left to reduce noise. I seriously cannot imagine how anyone can ride his kettle on a public road with JEMCO´s - I dont think a stock airbox makes such big difference. Don´t get me wrong -I love this sound, but it makes it impossible to use this bike in my country. I hope I find ways to reduce noise level significantly. Any ideas welcome.

Here is a short video - turn volume to max to get an idea of what I am talking about

https://youtu.be/qkUVLFUDM4o


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Tue Apr 11, 2017 10:28 pm 
Offline
Moto GP
User avatar

Joined: Mon Nov 03, 2008 10:47 am
Posts: 5759
Location: Illinois
I think that the muffler volume is too small and the steel shell resonates.

As a quick fix, see if you can find aluminium tube that slips over the existing muffler shell. It 's a tight enough fit (no rattles) it will reduce noise radiated out from the side of the can.

If that doesn't work or work well enough, try to cut the outer muffler shell off and fit an adapter and larger bore aluminum outer sleeve and more sound absorbing mat around the stock core.

You might also try a smaller core perforated tube, but too much smaller and it will overheat.

If that is still not enough, you may need to design a different baffle arrangement, but try larger volume and softer outer skin (Al) first.


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Apr 12, 2017 6:14 am 
Offline
Still in the Driveway

Joined: Wed Dec 30, 2015 12:14 pm
Posts: 3
Location: Leigh-On-Sea
Country: UK
Bikes owned: TS250, GT500
This raises a question I was going to ask as part of my upcoming GT500 race rep build - Gordon Jennings advocated in his book that trials with extending the tailpipe into the baffle cone reduced noise and in some cases increased power slightly. Does anyone have any evidence that this has been tried since he wrote the book back in the 70's?


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Apr 12, 2017 6:24 am 
Offline
Moto GP
User avatar

Joined: Fri Oct 24, 2008 5:55 pm
Posts: 3916
Location: Lancaster Pa.
Country: US
Bikes owned: GT750 x2 97 -1200 Bandit 86 GSXR1100
On my last custom GT i used this idea when building the chambers , i inserted the stinger into the last cone . The exhausts are still quite loud but i cannot tell how loud they would have been in normal fashion .Image

_________________
the older i get the faster i was


Top
 Profile  
 
 Post subject: Re: BIMOTA GT1 Project
PostPosted: Wed Apr 12, 2017 6:53 am 
Offline
On the main road
User avatar

Joined: Fri Nov 01, 2013 8:30 pm
Posts: 100
Location: Minnesota
Country: usa
Bikes owned: www.street-unique.com
I ran internal stingers on the pipes on my GT250/T330 build shown in my avatar.

_________________
2006 Triumph Sprint ST
1990 GSX-R1100 streetfighter
LS650 powered custom framed café
1972/3 T500-hopefully will be Lyster framed
1969 T500-parts/project?
1983 GR650-project

Past bikes
1974 GT250/T350 custom
1986 GSX-R750
1979 GS750
1974 TS250
1981 TS100


Top
 Profile WWW  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 110 posts ]  Go to page Previous  1 ... 3, 4, 5, 6, 7, 8  Next

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group
Sundial Moto Sports forum © by Eric F. Kalamaja
Suzuki2Strokes.com