Second question regarding my coffee talk post - Triumph Forum: Triumph Rat Motorcycle Forums
Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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post #1 of 25 (permalink) Old 07-20-2019, 06:51 PM Thread Starter
SuperStock
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Second question regarding my coffee talk post

So for some reason the shop that put in my new premiers under a warranty repair put on 928’s and not the 930’s it should have. Is this going to be a problem that I need to address beside the obvious they aren’t 930’s. Will the 928 property jetted work properly or do I need to go back again!!

Steven
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post #2 of 25 (permalink) Old 07-20-2019, 06:58 PM
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If I paid for the right parts and got the wrong ones I'm bloody sure I would go back. Sounds like they are trying to fob you off with whatever they had on the shelf.

Rod
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post #3 of 25 (permalink) Old 07-20-2019, 07:06 PM Thread Starter
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Actually had to order them, price is the same but cost me nothing due to being covered under a generous warranty (had the bike for 9 months and put 4000 miles on it) I mainly worried about function not worried about originality. What 2mm amongst friends right ?

Steven
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post #4 of 25 (permalink) Old 07-20-2019, 10:19 PM
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Well if your happy with what you got then thats all good. However for what it's worth, there would have been a reason the factory fitted the 930's and whilst you may well have had to play with the jetting for modern fuel you would have had the correct size carb.

So here is the question, how did your shop ( who despite having to order in components managed to order the wrong ones and fitted them anyway ) work out the jetting required for your now non stock carb set up?

Sounds like I'm being a **** but it would be a real shame for you to hole a piston because the "out of box" jetting was to lean.

Rod
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post #5 of 25 (permalink) Old 07-20-2019, 11:04 PM Thread Starter
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It was upped to a 190 ?
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post #6 of 25 (permalink) Old 07-21-2019, 05:06 AM
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928s might restrict your maximum speed, but might not. My T110 will exceed 100 mph with twin 928s, but it is not your Bonneville.

Introducing a step from 28 mm to 30 mm in the inlets might upset tuning in some throttle ranges, or it might not.

The non-standard choke size does put you back to square one with main jet size, slide cutaway and needle position though. Having said that, it’s good practice to tune standard 930 carbs anyway, rather than follow the old Triumph spec.

That’s all notwithstanding the shop not doing what you asked and the complaints you’ll get from anyone who buys your bike.
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post #7 of 25 (permalink) Old 07-21-2019, 09:48 AM
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If it was me, I would want the correct carbs on the bike. That's what you paid for and that's what the bike should have. Just my 2 cents and that is why I do all my own work and restorations.
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post #8 of 25 (permalink) Old 07-21-2019, 10:56 AM
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Perhaps Burlen didn't have proper carbs and sold what they had on a shelf.
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post #9 of 25 (permalink) Old 07-21-2019, 12:57 PM
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Just my thoughts. . .
Ask yourself: a) Is this bike running well?
b) Is the performance adequate?
c) Is it running rich or lean (what do the spark plugs look like)?

If you're happy with answers to all the above, I would say everything is just fine.
As you say, What's 2mm between friends? I've built bikes to run with all sorts of odd ball carbs. If you set them up right, you'll be okay.

John
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post #10 of 25 (permalink) Old 07-22-2019, 11:15 AM Thread Starter
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Ok temps have come down a bit and I did a two-up ride last night and worked her over pretty good to test out these new carbs. One change is I did a 50/50 mix of 110 octane leaded fuel with pump 93 octane fuel. Vast improvement from pump gas performance, this bike thinks she’s a queen God forbid it’s should run on average pump fuel. Anyways afternoon solo ride felt good, idled OKish, pulled pretty strong. But am I crazy or is this psychosomatic I think it sounds different and pulls a little bit less. So would 2mm make a difference or can this be a jetting issue that can be adjusted? No pinging pulling out when heated up like before, still a few pops through the carbs and erratic enough “tickover” pulling up to stoplights that I do t trust it to just leave off the throttle. Two-up ride went smooth worked it hard as I could with a passenger. No pings pulling out, no pinging when twisting the grip coming out of the curves. Still pops through the carbs when you “goose it”before letting clutch out at light etc (prob a bad habit I know) my big twin Harley with an S&S two throat carb hated that, liked a smooth roll on throttle. So here’s the list of new questions.

What causes the carb pop

Was pinging issue low octane issue or lean issue

Is the sound and feel really different due to 928’s and not proper 930’s installed

Thanks in advance and yes I’m going to start getting my hands dirty on this bike because this “free warranty work” is starting to cost me a lot of time and money. I can make more money, but not time.

Steven
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