shrek Posted December 31, 2015 Share Posted December 31, 2015 I have the Kirker left low exit 4-2-1 on my 3rd gen. This exhaust connects to the stock down pipes from the front and rear cylinders. I could care less whether the dang thing makes any more power, I just wanted to show off the beautiful 8 spoke. I would be interested in a left high mount, sans silencer. If the price is under 1K US, I'm in. I've thrown so much dough ray me at this old scoot over the years, what is a few more bucks. It's not like I'm ever going to sell the damn thing. Link to comment Share on other sites More sharing options...
750 Posted December 31, 2015 Share Posted December 31, 2015 I have the Kirker left low exit 4-2-1 on my 3rd gen. This exhaust connects to the stock down pipes from the front and rear cylinders. I could care less whether the dang thing makes any more power, I just wanted to show off the beautiful 8 spoke. I would be interested in a left high mount, sans silencer. If the price is under 1K US, I'm in. I've thrown so much dough ray me at this old scoot over the years, what is a few more bucks. It's not like I'm ever going to sell the damn thing. Why not spend about a tenth of that and just get a high level link pipe welded in place with a 2" outlet? The world's your oyster for can choice then. Link to comment Share on other sites More sharing options...
coupedupsubie Posted January 1, 2016 Share Posted January 1, 2016 I got lucky and my 4th gen came with the TBR left exit low mount. From what I was told I'm the third owner. The original owner put the TBR system on and was unhappy with how it ran. He supposedly called TBR and they gave him specs for rejetting/tuning the carbs for it to run right. This leads me to believe that they did do testing. The bike runs very smooth and doesn't run too lean or rich as far as I can tell. I will be putting it on a dyno to see hp and AFR this spring. Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted January 1, 2016 Member Contributer Share Posted January 1, 2016 There's a big difference between re-jetting the carbs to compensate for a freer flowing exhaust and changing the design of the header system to maximise the power of the engine, either at the peak, or perhaps in the mid-range. Any time you change the exhaust or intake you may need to re-jet. In fact, I would say that if an exhaust mod does not require re-jetting, you've probably not added any performance! The point is that tuning takes time (much less time if you have a dyno, which all exhaust manufacturers certainly have). Re-jetting to get the most performance out of a given exhaust system is a lot easier than experimenting with the header's configuration and trying different designs in order to maximise the performance potential of the engine--and this requires a huge amount of time. On a bike like a VFR, very few of which have ever ventured onto a track, much less raced or (lol) battled for a championship, and which requires a relatively complicated header design and manufacturing process, you can understand why TBR (and everyone else, apart from HRC!) would have just figured if it fit, it would be good enough. Sure, they may have had a reputation to defend, but VFR guys were never going to make or break their businesses... Ciao, Link to comment Share on other sites More sharing options...
Alhazred Posted January 2, 2016 Share Posted January 2, 2016 I got lucky and my 4th gen came with the TBR left exit low mount. From what I was told I'm the third owner. The original owner put the TBR system on and was unhappy with how it ran. He supposedly called TBR and they gave him specs for rejetting/tuning the carbs for it to run right. This leads me to believe that they did do testing. The bike runs very smooth and doesn't run too lean or rich as far as I can tell. I will be putting it on a dyno to see hp and AFR this spring. Would you care to share those jetting specs with us? I have never seen that information on any of the forums,it would be very interesting to see what Two Brothers recommended. Link to comment Share on other sites More sharing options...
shrek Posted January 2, 2016 Share Posted January 2, 2016 I have the Kirker left low exit 4-2-1 on my 3rd gen. This exhaust connects to the stock down pipes from the front and rear cylinders. I could care less whether the dang thing makes any more power, I just wanted to show off the beautiful 8 spoke. I would be interested in a left high mount, sans silencer. If the price is under 1K US, I'm in. I've thrown so much dough ray me at this old scoot over the years, what is a few more bucks. It's not like I'm ever going to sell the damn thing. Why not spend about a tenth of that and just get a high level link pipe welded in place with a 2" outlet? The world's your oyster for can choice then. I'm planning to build another 3rd gen and I'm too lazy to get out my tig. In the old days, we all had more time than money. #firstworldproblems Link to comment Share on other sites More sharing options...
coupedupsubie Posted January 2, 2016 Share Posted January 2, 2016 Would you care to share those jetting specs with us? I have never seen that information on any of the forums,it would be very interesting to see what Two Brothers recommended. Sorry but I have no plans to open up the carbs. There are a fair number of notes in the shop manual that came with the bike. I will see if anything was written down. Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted January 2, 2016 Member Contributer Share Posted January 2, 2016 FWIW, I have dug out the instructions from the Factory Pro jet kit for my 3rd-gen. Not especially useful, but jet kit manufacturers like them and DynoJet probably have more comprehensive tuning suggestions available if you ask them. Factory Pro VFR750 1990-93 Jet Kit Instructions (1997).pdf Factory Pro Carburetor Tuning Guidelines (1996).pdf Ciao, Link to comment Share on other sites More sharing options...
750 Posted February 22, 2016 Share Posted February 22, 2016 Any update on this or is it another no-go project? Link to comment Share on other sites More sharing options...
stryker Posted February 24, 2016 Author Share Posted February 24, 2016 No updates until Tyga is finished with the 5th/6th gen header. Link to comment Share on other sites More sharing options...
SnowCrash Posted March 1, 2016 Share Posted March 1, 2016 You can count me in for one, maybe two as I have two 4th gens in the garage. Link to comment Share on other sites More sharing options...
stryker Posted March 2, 2016 Author Share Posted March 2, 2016 Ok, Snowcrash. Will update here when the time comes. Right now we'll just have to wait for Tyga to finish their 5/6th gen project. Link to comment Share on other sites More sharing options...
TheStig Posted March 9, 2016 Share Posted March 9, 2016 Paul at Tyga is a great guy - they're busy usually with many products to manufacture, etc. but are absolute enthusiasts (They've supplied me a lot of parts for an NSR250 MC28 project and are still in the midst of doing some one-off work for it too - not many companies go over & above in this way like they have been known to do). So I hope someone will supply them a 3rd / 4th gen left exit TBR kit so they can make up an exhaust kit for a high level RC30 styled exhaust silencer to be mountable. I daresay Tyga would return the loaned parts and perhaps supply a free kit to the supplier (Don't quote me on this, that's just my guess!) as a thank you, so I hope someone stands up and offers to help. As for jetting, it will have to be right. Perhaps someone will have his bike dyno'd and set up properly and share what jet sizes were used. That way all can benefit. Perhaps a jetting specialist in the U.S. (Where the market for such exhausts is probably largest) would be interested in developing such a kit. Someone should ask around... Without a collector box the exhaust sound really becomes much nicer but it would be best to jet accordingly as back pressure will naturally be different as a result of the change of design. Link to comment Share on other sites More sharing options...
Alhazred Posted March 9, 2016 Share Posted March 9, 2016 My offer still stands to help make this happen if Tyga goes for it. Link to comment Share on other sites More sharing options...
stryker Posted March 9, 2016 Author Share Posted March 9, 2016 Yes, Paul seems like a guy that is really helpful and passionate about bikes. Good idea about the jetting. Factory pro has some pretty good guidelines and jetting settings for different setups. And Alhazred that sounds excellent! Link to comment Share on other sites More sharing options...
TheStig Posted March 10, 2016 Share Posted March 10, 2016 Alhazred - sounds good!From what Paul mentioned I think Tyga intends to make these.... there's also a few other things planned for VFR's so they're turning their attention to these bikes (Single nut cover for rear wheel is one...), which can only be a good thing, but it'll take time. Link to comment Share on other sites More sharing options...
stryker Posted March 10, 2016 Author Share Posted March 10, 2016 Yes, it will take some time, but Paul seems very optimistic. Have you heard anything about the 5/6th gen header project from Paul? Link to comment Share on other sites More sharing options...
TheStig Posted March 10, 2016 Share Posted March 10, 2016 Yes, it will take some time, but Paul seems very optimistic. Have you heard anything about the 5/6th gen header project from Paul? Only that they're working on it... which doesn't indicate how far they've progressed, but shows commitment. :) Link to comment Share on other sites More sharing options...
Falseneutral Posted March 14, 2016 Share Posted March 14, 2016 I don't care about performance and will purchase a high lefty if produced. I'll certainly get stainless 5th gen headers too,they're the only thing that don't look new still. Link to comment Share on other sites More sharing options...
TheStig Posted March 16, 2016 Share Posted March 16, 2016 Message from Paul via e-mail today, which I feel sure he won't mind me sharing... Hi Miguel "Thanks for your feedback on the exhaust. The plan is to make the exhaust in the same pipe diameter as stock but to the TBR spec or thereabouts. We really need a sample but Russell bless him, just sent us two stock headers which we could have sourced here and saved us 300 dollars in shipping and import duty, oh well! We will proceed with this when we have the TBR or similar. Although we are convinced there is a demand and the VFR is one of those models to stay, we are really stretched for time at the moment and would need to source a bike and do a lot of dyno runs etc to develop our own system. Love the swing arm. Would look good on a VFR750 with some Sebimoto RCV1000 bodywork made to fit. J Paul" So, Alhazred can we get your TBR left exit header set to Paul ? Let's make it happen (I would if I could but I can't = 'cos I don't have one Link to comment Share on other sites More sharing options...
SnowCrash Posted March 16, 2016 Share Posted March 16, 2016 HYPE!! Link to comment Share on other sites More sharing options...
Alhazred Posted March 16, 2016 Share Posted March 16, 2016 We haven't decided which header to have replicated or even have an official list of who is committed yet. I thought Stryker was heading this one up,I think we need to stick with one person dealing with Tyga to get this project done. The cost of shipping is going to be a big problem as I cannot afford $300(confirmed with post office)to ship the header to Thailand. Link to comment Share on other sites More sharing options...
stryker Posted March 16, 2016 Author Share Posted March 16, 2016 Yes, Alhazred lets do this. How much would the shipping cost for your TBR header be from where you live to Tyga in Thailand? I'm willing to help you out with the shipping cost. 300$ wow! What do you guys think, if we make a commit to buy list, Then everybody on that list would pay their share of the shipping cost of alhazred's header? Link to comment Share on other sites More sharing options...
stryker Posted March 16, 2016 Author Share Posted March 16, 2016 Will of course have to talk to tyga about price, shippimg and other details, before a commit to buy list can be done. And The Stig, it is totally okay with me that you've contacted Tyga.? Link to comment Share on other sites More sharing options...
TheStig Posted March 17, 2016 Share Posted March 17, 2016 Hi Alhazred. I speak to Paul every now & then about other stuff and he mentioned the header again, so I shared what he'd said that's all.Being in Japan, I don't really have any intention of dealing with Tyga with regard to this particular project so forgive me if you thought I was stepping on your feet here. I don't mind sharing the cost of getting a left hand exit header to Tyga if that helps and think that's a good idea. Link to comment Share on other sites More sharing options...
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