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Author: Subject: yamaha r1 1998 turbo
r1waterboy

posted on 9/6/17 at 04:05 PM Reply With Quote
yamaha r1 1998 turbo

Hi all newbie to the site.
Im looking for some help as im struggling to get my R1 turbo to run its all built but having issues with it running it will start on choke but as its warming up it doesnt want to idle or rev through wants to cut out and then when warm its very hard to start ive change the carbs as thought maybe a problem with them but made no diffrence im pretty sure its not a fuel issue and im now at the point of i dont know what to do next any help would be much appreciated thanks Mark

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CosKev3

posted on 9/6/17 at 05:29 PM Reply With Quote
Just converted same engine,but gone over to fuel injection.

Any pics of your carb set up?

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r1waterboy

posted on 9/6/17 at 05:45 PM Reply With Quote
Hi bud not to hand but will get some shortly
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jambojeef

posted on 9/6/17 at 08:15 PM Reply With Quote
Got any pictures of your set-up?
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r1waterboy

posted on 9/6/17 at 08:56 PM Reply With Quote
https://1drv.ms/i/s!Am7Ip6n7LslJkUDO_8TxgJ0sy19Q
https://1drv.ms/i/s!Am7Ip6n7LslJkUFsYaFwEdZcxc7p

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CosKev3

posted on 9/6/17 at 09:53 PM Reply With Quote
Have you tried running it without the turbo plenum connected?

Just whip the silicone bends off the carbs and see how it runs then

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r1waterboy

posted on 13/6/17 at 06:59 PM Reply With Quote
No mate I've not will it run OK like that without plenum
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CosKev3

posted on 13/6/17 at 07:32 PM Reply With Quote
Yeah it will be just like it was standard, air entering through the carbs
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r1waterboy

posted on 13/6/17 at 07:52 PM Reply With Quote
OK I will give that a shot get back to you cheers
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CosKev3

posted on 13/6/17 at 07:58 PM Reply With Quote
Yeah if it runs fine with plenum disconnected you then know it's something wrong with the actual turbo/plenum set up.

Just had a thought,have you checked it's charging properly once running?

As you have no battery light on bike clocks you don't get a warning if the charging system is OK.
Common fault on the old R1 looms to have bad connections on either the multiplug into bottom of regulater, or the multiplug where stator wire plugs into main loom

[Edited on 13/6/17 by CosKev3]

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hobbsy

posted on 14/6/17 at 03:32 AM Reply With Quote
Looking at the photo is this in some kind of 4wd kart?

If so more photos please!

I'm rubbish with carbs so probably can't help with your problem but I'm sure others will be along who have more experience with them

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r1waterboy

posted on 14/6/17 at 09:05 PM Reply With Quote
quote:
Originally posted by CosKev3
Yeah if it runs fine with plenum disconnected you then know it's something wrong with the actual turbo/plenum set up.

Just had a thought,have you checked it's charging properly once running?

As you have no battery light on bike clocks you don't get a warning if the charging system is OK.
Common fault on the old R1 looms to have bad connections on either the multiplug into bottom of regulater, or the multiplug where stator wire plugs into main loom

[Edited on 13/6/17 by CosKev3]


Hi It seems to be charging OK and also makes no difference with silicone pipes off

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CosKev3

posted on 14/6/17 at 09:15 PM Reply With Quote
Ah right.
Are all electrical connections to CDU and sensors OK?
Has the engine had any work done,as in a rebuild/compression lowered etc?

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r1waterboy

posted on 14/6/17 at 09:17 PM Reply With Quote
quote:
Originally posted by hobbsy
Looking at the photo is this in some kind of 4wd kart?

If so more photos please!

I'm rubbish with carbs so probably can't help with your problem but I'm sure others will be along who have more experience with them


Yes it's a Go kart changed a few times now started single axle now double and also looking to having it running a turbo it's a older photo but 1 I have on phone now blue with a spoiler and few other bits

https://1drv.ms/i/s!Am7Ip6n7LslJkV-npB37uZcJ1gbd

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r1waterboy

posted on 14/6/17 at 09:26 PM Reply With Quote
quote:
Originally posted by CosKev3
Ah right.
Are all electrical connections to CDU and sensors OK?
Has the engine had any work done,as in a rebuild/compression lowered etc?


Engine standard no work done to it ran sweet before fitted turbo etc everything on the electrical side seems to be ok.
Im still for thinking its to with the carbs maybe not pressurising or something

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CosKev3

posted on 15/6/17 at 06:45 AM Reply With Quote
No it can't be to do with the carbs not pressurising, as that will only happen when the turbo is creating boost.

At idle the carbs should work just the same as they do on a non turbo engine,and by removing the plenum the engine should have run just the same as a standard R1 engine.

Have you stripped the carbs to clean them etc?

Also they will need rejetting and the needle heights altering for the charged set up?

[Edited on 15/6/17 by CosKev3]

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SJ

posted on 15/6/17 at 06:57 AM Reply With Quote
What sort of set up do you have to match the fuel pressure to boost pressure?
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CosKev3

posted on 15/6/17 at 08:21 PM Reply With Quote
I've converted to injection,as I didn't fancy the hassle of rejetting the carbs and the fact you can't alter the timing on the original R1 CDU
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SJ

posted on 16/6/17 at 09:07 AM Reply With Quote
quote:

I've converted to injection,as I didn't fancy the hassle of rejetting the carbs and the fact you can't alter the timing on the original R1 CDU



Sorry - that was a question for the OP.

Stu

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CosKev3

posted on 16/6/17 at 09:12 AM Reply With Quote
quote:
Originally posted by SJ
quote:

I've converted to injection,as I didn't fancy the hassle of rejetting the carbs and the fact you can't alter the timing on the original R1 CDU



Sorry - that was a question for the OP.

Stu


If you look at his pics in the links he has set it up like most carbed R1 engines when charged,pipes going off the throttle body to pressurise the float bowl

[Edited on 16/6/17 by CosKev3]

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r1waterboy

posted on 16/6/17 at 09:26 PM Reply With Quote
quote:
Originally posted by SJ
What sort of set up do you have to match the fuel pressure to boost pressure?

I'm running 5/psi fuel and 7 psi boost

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r1waterboy

posted on 16/6/17 at 09:29 PM Reply With Quote
quote:
Originally posted by CosKev3
No it can't be to do with the carbs not pressurising, as that will only happen when the turbo is creating boost.

At idle the carbs should work just the same as they do on a non turbo engine,and by removing the plenum the engine should have run just the same as a standard R1 engine.

Have you stripped the carbs to clean them etc?

Also they will need rejetting and the needle heights altering for the charged set up?

[Edited on 15/6/17 by CosKev3]


I have tried many cleaning many times made no difference that's when I got another set of cards and outcome was the same I have changed the jets to 125 but haven't adjusted needle heights.

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CosKev3

posted on 17/6/17 at 01:39 PM Reply With Quote
Soooo hard to diagnose without seeing it.

Fuel pumps ok?

When it struggles to start afterwards perhaps whip a plug out and see if it's wet?

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r1waterboy

posted on 17/6/17 at 09:05 PM Reply With Quote
quote:
Originally posted by CosKev3
Soooo hard to diagnose without seeing it.

Fuel pumps ok?

When it struggles to start afterwards perhaps whip a plug out and see if it's wet?


Yeah understand yes fuel pumps good it runs like it's only running on 3 cylinders miss fire

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CosKev3

posted on 17/6/17 at 09:47 PM Reply With Quote
Next time it does it remove the plugs one at a time and check if the plugs are wet/sooty and check you get a spark on all cylinders.
At least then should be able to narrow down which cylinder is misfiring.
If you have a spark on all four cylinders and none of the plugs are wet then you can explore the carb relating to that cylinder.
They are not hard to strip down and clean all jets/air correctors etc.

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