Britbike forum

Classic British SparesKlempf British PartsBaxter CycleThe Bonneville ShopLowbrow CustomsGirling Classic MotorcycleLucas Classic MotorcycleHepolite PistonsIndustrial tec supplyJob Cycle

Upgrade your membership to Premium Membership or Gold Membership or even Benefactor


New Sponsor post
Triumph 650/750 High-Output Alternator Kit
by The Bonneville Shop - 01/13/23 11:29 pm
New FAQ post
Missing edit button
by wrench136 - 05/30/22 2:57 pm
News & Announcements
Premium members! 🌟
by Morgan aka admin - 01/28/23 3:01 pm
Buy BritBike staff a coffee ☕️ or pint 🍺
by Morgan aka admin - 01/15/23 9:29 am
Benefactor ✅
by Morgan aka admin - 01/08/23 8:38 pm
Gold members! ⭐️ ⭐️ ⭐️
by Morgan aka admin - 01/03/23 6:30 pm
How to guides - Technical articles
British Fasteners Specs
by Morgan aka admin - 01/03/23 1:29 pm
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Member Spotlight
Blown Income
Blown Income
La Plata, Md
Posts: 966
Joined: September 2008
Top Posters(30 Days)
Lannis 76
DavidP 64
Top Likes Received (30 Days)
Kev. 36
DavidP 25
Newest Members
sam keller, Raz, HermDawg, 47sqfour, Blackdoctor
12,383 Registered Users
Forum Statistics
Forums35
Topics76,514
Posts783,709
Members12,383
Most Online204
Jul 10th, 2022
Random Gallery photo
Photo posting tutorial

Previous Thread
Next Thread
Print Thread
Page 10 of 10 1 2 8 9 10
NickL #889899 09/03/22 3:51 am
Joined: Apr 2005
Posts: 3,114
Likes: 151
Britbike forum member
Offline
Britbike forum member
Joined: Apr 2005
Posts: 3,114
Likes: 151
Tall gearing is probably better than low. The difference between the 654 and the 734 in one video. The 734 is short shifting and maybe 2/3-3/4 throttle. The 734 just does stuff so easy, so unstrained. It also handles 100% better even in a straight line. It actually accelerates fantastic. Wish I'd had this in the 1970s. This has baffled pipes as well. The baffle things bolt in and don't seem to effect power that I can tell. It doesn't struggle to get going.



mark
3 members like this: gavin eisler, JER.Hill, NickL
British motorcycles on eBay
NickL #890404 09/09/22 11:56 pm
Joined: Jan 2014
Posts: 2,403
Likes: 449
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Jan 2014
Posts: 2,403
Likes: 449
After some issues the result was 2nd over the two days.

All effort now will be focused on the offset 750 short stroke engine
with the 5 speed box.

Last edited by NickL; 09/09/22 11:58 pm.
3 members like this: gavin eisler, Mark Parker, JER.Hill
NickL #890669 09/13/22 11:44 am
Joined: Apr 2005
Posts: 3,114
Likes: 151
Britbike forum member
Offline
Britbike forum member
Joined: Apr 2005
Posts: 3,114
Likes: 151
Ben's race motor will be a 671 90degree. If I put a data logger on the Firebird I can test it better and get data, then swap Ben's 671 in and test and dyno tune it with the data logger, plus put a bung in the exhaust and dial in the carbs. We can go big bore sometime in the future but it will be interesting to see what the smaller size can do.

What I have to do is work out getting oil into the crank. I can see where it comes from and where it has to go but do you use a small spigot and seal Nick? Is it in that case or something outside it?


mark
NickL #890700 09/13/22 11:05 pm
Joined: Jan 2014
Posts: 2,403
Likes: 449
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Jan 2014
Posts: 2,403
Likes: 449
When Matt drops the engines over, i'll take some photos of the
timing cover mods. Its just a top hat for the crank with a seal in it
the crank quill can be 8 or 10mm od and 4.5 id pressed in.
The pick up at the oil pump end is just a bush, the oil pump bolt
has an extended 8mm top with an o-ring which plugs into the bush.

I need to sort out balance weights etc for the offset so i'll email you.

NickL #890758 09/14/22 7:40 pm
Joined: Jul 2012
Posts: 473
Likes: 49
Britbike forum member
Offline
Britbike forum member
Joined: Jul 2012
Posts: 473
Likes: 49
Mark

I'll email you some photo's as well that you can look at.

regards

John

NickL #890826 09/15/22 11:33 pm
Joined: Apr 2005
Posts: 3,114
Likes: 151
Britbike forum member
Offline
Britbike forum member
Joined: Apr 2005
Posts: 3,114
Likes: 151
Thanks John.

So here is a great photo of the protagonists.

[Linked Image from i.postimg.cc]

Chasing the big Norton with the 650.

[Linked Image from i.postimg.cc]

[Linked Image from i.postimg.cc]

Last edited by Mark Parker; 09/15/22 11:38 pm.

mark
1 member likes this: PEH
NickL #890837 09/16/22 7:26 am
Joined: Jun 2013
Posts: 160
Likes: 10
PEH Offline
Britbike forum member
Offline
Britbike forum member
Joined: Jun 2013
Posts: 160
Likes: 10
Is that a 2 into one exhaust?

PEH #890890 09/17/22 12:06 am
Joined: Jan 2014
Posts: 2,403
Likes: 449
NickL Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Jan 2014
Posts: 2,403
Likes: 449
Originally Posted by PEH
Is that a 2 into one exhaust?


Yes, they link just before where the megga used to be, now
it's a sort of muted megga as we have silly regs now.

NickL #890920 09/17/22 8:58 am
Joined: Jun 2013
Posts: 160
Likes: 10
PEH Offline
Britbike forum member
Offline
Britbike forum member
Joined: Jun 2013
Posts: 160
Likes: 10
Interesting. I'm waying up what system to run on an A65 flattracker and a 2 into 1 Is readily available and cheap . I'm guessing not a lot in it performance wise?

PEH #890971 09/17/22 11:26 pm
Joined: Apr 2005
Posts: 3,114
Likes: 151
Britbike forum member
Offline
Britbike forum member
Joined: Apr 2005
Posts: 3,114
Likes: 151
PEH if you look at the video above I posted, that's basically a std A65 below the cylinder head and uses std '70 Firebird pipes mufflers and all, it's 21-47 gears so on a long track it would have legs. Instant grunt and I imagine wheel spin you may be able to control and use in flattrack. Being 650 means it would not hit as hard as a bigger engine and unless you are Mann or Aldana you probably wouldn't want it to. I would not use this frame and heavy stuff, But I expect you do not. If the tracks turn left both pipes are there if you deck it frown But they are up out of the way. Plus you can just buy them.


mark
Joined: Jun 2013
Posts: 160
Likes: 10
PEH Offline
Britbike forum member
Offline
Britbike forum member
Joined: Jun 2013
Posts: 160
Likes: 10
Mark, Strangely enough i already have the high front pipes in stock, It does sound well with great pick up on the video i have to say. Our tracks are all short 1/4 mile loose speedway except for Greenfield which is clay so good traction is key. The 750 Trackmaster i recently built has just under 50 bhp and 44 ftlbs of torque and goes well, the owner, rider loves it, he likes the old school 2 left side pipes and mega's, so he had some made in Titainium! more money than sense if you ask me, I will keep the high pipes in mind , i do like the look of them.

Page 10 of 10 1 2 8 9 10

Moderated by  Allan G 

Link Copied to Clipboard
British Cycle SupplyMorries PlaceKlempf British PartsBSA Unit SinglesPodtronicVintage MagazineBritBike SponsorBritish Tools & FastenersBritBike Sponsor






© 1996-2023 britbike.com
Powered by UBB.threads™ PHP Forum Software 7.7.5